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What is the Deadline for Submitting Self-Assessment Tax Returns for 2023-24?

Understanding the Importance of Self-Assessment Tax Returns and Key Deadlines

When it comes to tax obligations in the UK, self-assessment is one of the key processes that many taxpayers must navigate annually. The self-assessment system requires individuals to calculate and pay their taxes directly to HM Revenue and Customs (HMRC) rather than having taxes automatically deducted, such as through PAYE (Pay As You Earn) for employees. Understanding the deadlines for submitting self-assessment tax returns is crucial for avoiding penalties and staying compliant with HMRC rules.


What is the Last Date for Submitting Self-Assessment Tax Returns for 2023-24


Overview of Self-Assessment Tax Returns

Self-assessment tax returns are required by individuals who have income that is not taxed at the source. This includes income from self-employment, rental properties, investments, and other non-standard income streams. Self-assessment is used to declare taxable income, claim tax reliefs, and calculate the tax owed for a given tax year.

The UK tax year runs from 6 April of one year to 5 April of the following year. For the 2023-2024 tax year, the tax period begins on 6 April 2023 and ends on 5 April 2024. All income earned during this period must be declared in the self-assessment tax return submitted to HMRC.


It's important to note that even if you have only modest additional income, such as from casual freelance work, or earn interest from savings, you may still be required to submit a tax return. The rules surrounding who must file a return can be complex, but HMRC offers guidance on their website to help individuals determine their obligations.


Key Deadlines for Submitting Self-Assessment Tax Returns

Filing deadlines are a critical aspect of self-assessment that UK taxpayers must pay attention to. Failing to meet these deadlines can result in fines, interest on unpaid tax, and other penalties. There are two main deadlines that taxpayers must be aware of: the deadline for submitting a paper tax return and the deadline for filing the return online.


  1. Paper Tax Returns: If you plan to submit your self-assessment tax return via paper forms, the deadline is 31 October 2024 for the 2023-2024 tax year. This gives taxpayers approximately six months after the end of the tax year to compile and submit their return. HMRC advises submitting the return well in advance of the deadline to avoid any postal delays or other issues that could result in late submission penalties.

  2. Online Tax Returns: The deadline for submitting an online self-assessment tax return is 31 January 2025 for the 2023-2024 tax year. This extended deadline offers more time for individuals to compile their financial records and submit the return. Online filing is the most popular method, as it is quicker and more convenient for both the taxpayer and HMRC. Additionally, the online system allows individuals to check for errors before submission, reducing the likelihood of penalties due to incorrect information.

  3. Payment Deadlines: Along with submitting the tax return, taxpayers must also pay any tax they owe by 31 January 2025. There is usually a second payment deadline on 31 July for individuals who make advance payments, known as "payments on account." These payments help spread the cost of taxes for the next tax year.


Registering for Self-Assessment

For those who need to submit a self-assessment tax return for the first time, registration with HMRC is required. You must register for self-assessment by 5 October following the end of the tax year for which you need to file. For example, if you need to submit a tax return for the 2023-2024 tax year, you must inform HMRC by 5 October 2024.


The registration process is straightforward and can be completed online. Once registered, HMRC will issue a Unique Taxpayer Reference (UTR) number, which is essential for filing your return. It is important to complete this process early to ensure there is sufficient time to file the return before the deadline.


Penalties for Late Submission

One of the most significant concerns for UK taxpayers is the potential for penalties if they miss the submission deadline. HMRC operates a strict penalty regime for late returns and late payments, and these penalties can quickly accumulate.


  1. Initial Penalty: If the self-assessment tax return is not submitted by the deadline (31 October for paper returns or 31 January for online returns), an automatic penalty of £100 is applied. This penalty is levied even if no tax is owed or if any tax due has already been paid.

  2. Further Penalties: Additional penalties are applied if the return is more than three months late. For example, taxpayers can be fined £10 per day for up to 90 days, which could result in a maximum fine of £900. If the return remains unfiled after six months, further penalties of 5% of the tax due (or a minimum of £300) are charged. After 12 months, even more severe penalties may apply.

  3. Late Payment Penalties: If any tax owed is not paid by 31 January, interest charges and penalties are added. An initial late payment penalty of 5% of the unpaid tax is charged after 30 days. Further penalties of 5% are added at six and twelve months if the tax remains unpaid.


Importance of Accurate Record Keeping

Accurate record keeping is essential for completing a self-assessment tax return. Taxpayers should maintain records of all their income, expenses, and other relevant financial information throughout the tax year. These records may include:


  • Bank statements and credit card statements

  • Invoices and receipts for expenses

  • P60 or P45 forms if you have employment income

  • Pension statements

  • Details of rental income or dividends from investments


By keeping accurate records, individuals can ensure that their tax return is correct and complete. Inaccurate or incomplete returns may trigger investigations by HMRC, leading to delays and potential fines.


Taxpayers are legally required to keep their records for at least five years after the 31 January submission deadline of the relevant tax year. This means that for the 2023-2024 tax year, records must be retained until at least 31 January 2030.


Changes and Updates for the 2023-2024 Tax Year

Tax regulations and deadlines can change over time, so it is important to stay updated on any new developments for the 2023-2024 tax year. As of September 2024, HMRC has maintained the same deadlines for both paper and online submissions as in previous years. However, taxpayers should regularly check the HMRC website for any announcements or updates that may affect their obligations.


For example, in recent years, HMRC has increased the use of digital tools, such as the Making Tax Digital (MTD) initiative. Although MTD has primarily focused on VAT, it is expected to be rolled out to all self-employed individuals and landlords in the coming years. This could impact the way self-assessment tax returns are submitted, making it even more important to stay informed.



How to Submit Self-Assessment Tax Returns: A Detailed Guide

In the previous section, we discussed the importance of self-assessment tax returns, key deadlines, and the penalties for late submission. Now, let’s focus on the step-by-step process of submitting your self-assessment tax return, both online and via paper forms. With more people switching to online methods due to ease and efficiency, we will pay special attention to the online submission process. Additionally, we’ll explore common errors and provide strategies to ensure your tax return is accurate and timely.


Submitting a Self-Assessment Tax Return Online

Submitting your self-assessment tax return online is by far the most popular and recommended option by HMRC. It provides several advantages over paper submissions, including automated calculations, real-time error checks, and a longer submission window (31 January versus 31 October for paper returns). Let’s break down the steps for online filing.


Step 1: Register for Online Services

Before you can submit your self-assessment tax return online, you need to register for HMRC’s online services. If you’ve never submitted a return before, you will also need to register for self-assessment and obtain your Unique Taxpayer Reference (UTR) number. This UTR is a 10-digit number that you will use every time you submit a tax return.

To register for online services, follow these steps:


  • Go to the HMRC website and select "Sign in" or "Register."

  • Create a Government Gateway account by entering your personal details and setting up security information.

  • Once registered, HMRC will send an activation code to your registered address within 10 working days.

  • After you receive the code, log into your account to activate online services.


If you are self-employed, you will also need to provide details such as your National Insurance number and business details during registration.


Step 2: Gather Required Information and Documentation

One of the most critical aspects of submitting a self-assessment tax return is ensuring that all the necessary documentation and information are available before starting the online submission. Here’s a list of documents you should have on hand:


  • P60 or P45: If you are employed at any point during the tax year, these forms summarize your total income and tax paid.

  • Bank Interest: If you’ve earned interest on savings, gather the interest amounts received and any tax deducted.

  • Self-Employment Income: For those self-employed, you need a summary of your income and expenses for the tax year.

  • Rental Income: If you rent out property, include a summary of rent received and allowable expenses such as maintenance and repairs.

  • Dividends: If you own shares and received dividends, ensure you have documentation detailing the dividend income.

  • Pension Contributions: Any pension contributions that qualify for tax relief should be documented.

  • Gift Aid Donations: Charitable donations that qualify for Gift Aid may offer additional tax relief, so keep records of donations.


Step 3: Complete the Tax Return Online

After gathering all the necessary information, you’re ready to log in to your HMRC account and start the self-assessment submission. Here’s how:


  • Log in to your account using your Government Gateway ID and password.

  • Select ‘Complete a tax return’ from the menu.

  • The online system will ask a series of questions to determine which sections of the return are relevant to your situation. These may include questions about your employment status, self-employment, savings, investments, rental properties, and overseas income.

  • Enter your financial details: Fill in your income, expenses, and any other relevant details. The system will automatically calculate your tax liability as you fill in each section.

  • Claim Reliefs: If applicable, claim reliefs like pension contributions, marriage allowance, or Gift Aid. This will reduce your taxable income and the amount of tax you owe.

  • Review the Summary: Before submitting, review the entire return summary. Ensure that all figures are accurate and check for any potential errors flagged by the system.


Step 4: Submit the Return and Payment

Once you’ve reviewed everything, you can submit the return electronically. HMRC will send an acknowledgment of receipt via email, and you can view your submitted return anytime by logging into your account.


If you owe any tax, the system will inform you of the amount due and provide options to make payment. Payment is due by 31 January, and you can pay through various methods, including:


  • Debit or credit card

  • Bank transfer

  • Direct Debit

  • Payment via HMRC’s app


If you anticipate trouble paying the tax by the deadline, it’s advisable to contact HMRC to discuss a “Time to Pay” arrangement, which allows you to spread the payments over time.


Why Online Filing is Preferred:

  • Extended Deadline: The deadline for online submissions is 31 January, giving you an extra three months compared to paper submissions.

  • Error-Checking: HMRC’s online system checks for errors as you complete the return, reducing the likelihood of submitting incorrect information.

  • Immediate Confirmation: You receive an acknowledgment of your submission as soon as you file the return, providing peace of mind.


Submitting a Self-Assessment Tax Return on Paper

While online submission is preferred by many, some individuals still choose to submit their self-assessment tax returns using paper forms. The deadline for paper submissions is earlier, on 31 October 2024 for the 2023-2024 tax year, so it’s important to begin the process early to avoid missing the deadline.


Step 1: Obtain the Required Forms

To submit a paper tax return, you will need form SA100, the main self-assessment form. You can request a copy of this form from HMRC by calling their helpline or downloading it from their website.


If you have additional income sources, such as rental income or overseas income, you may need to complete supplementary forms. These forms include:


Step 2: Fill Out the Forms

Completing a paper tax return is more manual and time-consuming than the online process. You must calculate your income and allowable expenses and enter them into the relevant sections. Take your time to ensure accuracy, as errors could result in fines or delays in processing your return.


Step 3: Submit the Return by Post

Once the form is complete, send it to the following address:


Self Assessment

HM Revenue and Customs

BX9 1AS

United Kingdom


Make sure to send your tax return well in advance of the 31 October deadline to account for any postal delays.


Step 4: Pay Any Tax Owed

As with online submissions, you must pay any tax owed by 31 January 2025. Payment options for paper filers are the same, and HMRC will send confirmation when your payment is received.


Payment Methods:

  • Bank Transfer: You can pay your self-assessment tax directly to HMRC via a bank transfer. HMRC’s account details are available on their website, and you must include your Unique Taxpayer Reference (UTR) as the payment reference.

  • Direct Debit: If you prefer, you can set up a direct debit to pay your self-assessment tax. This method allows you to spread the cost of your tax bill over several months.

  • Credit or Debit Card: HMRC accepts payments by credit or debit card, but be aware that fees may apply for credit card payments.

  • Pay by HMRC App: HMRC’s mobile app allows taxpayers to pay their self-assessment bill quickly and easily from their smartphone.


Payments on Account:

If your tax liability exceeds £1,000, you may be required to make payments on account. These are advance payments for the following tax year, based on your current year’s tax liability. The payments are made in two installments:


  • 31 January: First payment on account.

  • 31 July: Second payment on account.


If your actual tax liability for the next year turns out to be lower, HMRC will adjust the payments on account accordingly, and you may receive a refund or a reduction in the following year’s payment.


5. Reviewing Your Self-Assessment Tax Return

After submitting your return and making the necessary payments, it’s essential to review your tax return in case any amendments need to be made. HMRC allows you to make changes to your return within 12 months of the submission deadline. For the 2023-2024 tax year, this means you can amend your return until 31 January 2026.


Reasons to Amend a Tax Return:

  • Incorrect Figures: If you realize you have entered incorrect figures for income or expenses, you should update the return to avoid underpayment or overpayment of tax.

  • Additional Income or Reliefs: If you discover additional income or tax reliefs that were not included in your original return, you can amend the return to reflect the changes.


You can amend an online return by logging into your HMRC account and selecting “Amend a return.” For paper returns, you will need to submit a new corrected return.


6. Understanding HMRC’s Review Process

After you submit your self-assessment tax return, HMRC may decide to review or investigate your return. This is known as an enquiry, and it can be either a full investigation into all aspects of your return or a targeted enquiry focusing on specific sections.


Why HMRC Might Investigate:
  • Discrepancies in the Return: If HMRC identifies significant discrepancies or irregularities in your tax return, they may open an enquiry.

  • Random Selection: HMRC conducts random checks on a small percentage of tax returns each year as part of its compliance procedures.

  • Industry Risk: Certain industries, such as cash-based businesses, are more likely to face scrutiny from HMRC.


What to Expect in an HMRC Investigation:

If HMRC opens an enquiry, they will request additional information and documents to support the figures in your tax return. It’s important to respond promptly and provide all the requested information. Having accurate records on hand will make the process smoother and help resolve the enquiry quickly.


Submitting a self-assessment tax return is a vital responsibility for millions of UK taxpayers, from the self-employed to landlords and individuals with foreign income. Understanding the deadlines, keeping accurate records, and ensuring timely payments are crucial to avoiding penalties and staying compliant with HMRC.

While the process can seem complex, following the correct steps—whether filing online or on paper—will ensure that you meet your obligations without stress. By planning ahead, keeping thorough records, and seeking professional advice if necessary, you can ensure a smooth and accurate self-assessment process.


Common Mistakes to Avoid When Filing

Even with the best preparation, mistakes can happen. Here are some common errors to watch out for when filing your self-assessment tax return:


  1. Missing the Deadline: Missing the filing deadline is one of the most costly mistakes. If you know you’re going to miss the deadline, consider submitting a provisional return and updating it later.

  2. Incorrect UTR or National Insurance Number: Ensure your Unique Taxpayer Reference (UTR) and National Insurance number are entered correctly. Errors in these fields can result in processing delays.

  3. Not Declaring All Income: You must declare all taxable income, including earnings from side jobs, savings interest, rental income, and investments. Failure to do so could result in penalties.

  4. Overlooking Deductions and Reliefs: Don’t forget to claim all allowable expenses and tax reliefs, such as pension contributions, business expenses, or Gift Aid donations. These reduce your tax liability.


Using Commercial Software for Self-Assessment

While HMRC’s online system is sufficient for most taxpayers, some individuals may prefer to use commercial software to manage their self-assessment tax return. This is particularly useful for those with more complex tax situations, such as individuals with multiple sources of income or partnerships.


Commercial software options provide additional features, such as integration with accounting systems, automated calculations, and error-checking algorithms. Some of the popular providers include FreeAgent, TaxCalc, and Sage.

When selecting commercial software, ensure that it is HMRC-recognized. You can find a list of approved software providers on the HMRC website.



Tailored Advice for Different Taxpayer Groups: Self-Employed, Landlords, and Individuals with Foreign Income

In this section, we will explore specific considerations and challenges that different groups of taxpayers—such as the self-employed, landlords, and individuals with foreign income—face when submitting self-assessment tax returns. Each of these categories has its own set of rules and requirements, making it essential to understand the nuances to avoid mistakes and penalties.


Self-Employed Individuals: Navigating Self-Assessment

For self-employed individuals, filing a self-assessment tax return is mandatory as they do not have an employer to deduct taxes at the source through PAYE (Pay As You Earn). Self-employment includes those who work as sole traders, freelancers, or contractors. Here are some important aspects to consider for self-employed taxpayers.


1. Calculating Business Income and Expenses

When submitting a self-assessment tax return, self-employed individuals must report their total business income and allowable business expenses. HMRC expects a clear separation between business and personal finances, and it is advisable to keep well-organized records throughout the year.


  • Business Income: This includes all income earned through self-employment, whether it comes from client invoices, freelance work, or the sale of goods or services.

  • Allowable Expenses: Self-employed individuals can deduct certain business expenses from their total income, reducing their overall taxable income. Common allowable expenses include:


    • Office supplies (e.g., stationery, printers)

    • Travel costs (e.g., fuel, public transport for work purposes)

    • Business premises costs (e.g., rent or mortgage interest for a home office)

    • Marketing and advertising

    • Utility bills (for business use)

    • Professional services (e.g., legal fees, accounting fees)


It’s essential to note that personal expenses are not deductible, so any costs that mix personal and business use—such as using a personal car for both work and leisure—should be split accordingly, with only the work-related portion being claimed.


2. Class 2 and Class 4 National Insurance Contributions (NICs)

In addition to Income Tax, self-employed individuals must also pay National Insurance Contributions (NICs). The two types of NICs that self-employed taxpayers must consider are:


  • Class 2 NICs: These are fixed-rate contributions that are payable if your profits exceed a certain threshold (in the 2023-2024 tax year, this is £12,570). Class 2 NICs are typically lower, at £3.45 per week.

  • Class 4 NICs: These are based on a percentage of your profits. For the 2023-2024 tax year, the rates are 9% on profits between £12,570 and £50,270, and 2% on profits above £50,270.


Both Class 2 and Class 4 NICs are calculated and paid through the self-assessment system. If your self-employment income is below the threshold for paying Class 2 NICs, you can opt to make voluntary contributions to protect your eligibility for state benefits, such as the State Pension.


3. Payments on Account

One of the challenges for self-employed individuals is managing payments on account, which are advance payments made toward your tax bill for the following tax year. Payments on account are required if your tax bill is more than £1,000 and less than 80% of your total tax has already been paid through deductions at the source.

Payments on account are due in two installments: 31 January and 31 July. Each payment is typically 50% of the previous year’s tax bill. For example, if your total tax bill for the 2023-2024 tax year is £5,000, you would be required to make two payments on account of £2,500 each for the following tax year.


While payments on account can help spread the cost of your tax bill, they can be difficult to manage if your income fluctuates significantly from year to year. If you expect your profits to be lower in the upcoming tax year, you can request HMRC to reduce your payments on account.


Landlords: Taxation of Rental Income

For landlords, self-assessment is necessary to report rental income from property. Whether you own residential or commercial properties, or rent out part of your home, any income derived from renting property must be declared on your self-assessment tax return. Let’s explore some key points related to the taxation of rental income.


1. Reporting Rental Income

Rental income is taxed as part of your overall income and must be reported on form SA105, which is an additional section of the main SA100 tax return. The income you report should include:


  • Rent paid by tenants

  • Any non-refundable deposits

  • Income from leasing space (e.g., parking spaces, garages)


It’s important to report all income, even if you rent out a property on a short-term basis, such as through platforms like Airbnb. Failing to report rental income can lead to penalties and fines from HMRC.


2. Allowable Expenses for Landlords

Just like self-employed individuals, landlords can deduct allowable expenses from their rental income to reduce their tax liability. Common allowable expenses for landlords include:


  • Mortgage interest (although recent tax changes have limited the relief available for this)

  • Property maintenance and repairs (e.g., fixing a roof or boiler)

  • Insurance (e.g., landlord insurance, building insurance)

  • Utilities and council tax (if paid by the landlord)

  • Letting agent fees and legal fees

  • Advertising for tenants


Not all property-related expenses are allowable, though. For example, improvements to a property, such as an extension or new kitchen, are typically considered capital expenditure and must be deducted over time through Capital Gains Tax (CGT) calculations if you sell the property.


3. Rent-a-Room Relief

If you rent out a room in your home to lodgers, you may qualify for the Rent-a-Room Scheme, which allows you to earn up to £7,500 in tax-free rental income per year. This is especially beneficial for those who have spare rooms and want to generate extra income without incurring a significant tax bill. You must opt into the Rent-a-Room scheme when completing your self-assessment return.


4. Capital Gains Tax for Landlords

If you sell a rental property for a profit, you may be liable to pay Capital Gains Tax (CGT). For the 2023-2024 tax year, the CGT rates are 18% for basic rate taxpayers and 28% for higher rate taxpayers. It’s essential to keep records of the original purchase price and any improvements you made to the property, as these can be used to reduce the taxable gain.


Individuals with Foreign Income

Taxpayers who have income from foreign sources must also report it via the self-assessment system. This includes income from overseas employment, foreign investments, pensions, and rental income from overseas properties.


1. Declaring Foreign Income

Foreign income must be reported on the self-assessment return using form SA106, which is an additional section dedicated to foreign income. Even if you’re taxed on the income in another country, it must still be declared to HMRC. The UK has double taxation agreements with many countries, which means you may be able to claim relief for tax paid overseas.


2. Foreign Tax Credits

If you’ve paid tax on foreign income in another country, you may be eligible for Foreign Tax Credit Relief, which reduces the amount of UK tax you owe on that income. The relief is calculated based on the amount of foreign tax paid or the UK tax paid.


Self-Employed Individuals: Navigating Self-Assessment

For self-employed individuals, filing a self-assessment tax return is mandatory, as they don’t have an employer to deduct taxes through PAYE (Pay As You Earn). Whether you're a freelancer, contractor, or sole trader, you are responsible for calculating and paying your tax directly to HMRC. Let's break down the critical aspects of self-assessment for the self-employed:


1. Income Reporting for the Self-Employed

When you are self-employed, you need to report all your income on the self-assessment tax return. This includes:


  • Income from business activities: You must declare any money you make through your business activities. This could be from selling products, providing services, or any other form of revenue generated through self-employment.

  • Other sources of income: In addition to your self-employment income, you must declare any other taxable income, such as interest from savings, dividends, or rental income.


It's important to keep accurate records of all business transactions, including invoices, receipts, and bank statements, throughout the tax year. These documents will form the basis of your self-assessment tax return.


2. Allowable Expenses

One of the key benefits of self-employment is the ability to claim certain expenses that can reduce your taxable income. Known as allowable expenses, these are costs that you incur as part of running your business. The types of expenses you can deduct include:


  • Office costs: This includes expenses for stationery, phone bills, and office rent if you rent business premises.

  • Travel costs: You can claim for business-related travel, including fuel, train fares, and parking. However, commuting from home to your regular place of work does not qualify.

  • Marketing and advertising: Any expenses related to promoting your business, such as website hosting or print advertising, are deductible.

  • Professional fees: Fees paid to accountants, solicitors, or other professionals for business advice are also allowable.


To claim these expenses, you must ensure that they are "wholly and exclusively" for business purposes. If an expense is partly for personal use (for example, using your home as an office), you can only claim the portion that relates to your business activities.


3. Simplified Expenses

The UK tax system also allows self-employed individuals to use simplified expenses. This method allows you to claim flat-rate deductions for certain costs, such as using your home as an office or business travel. For example:


  • Working from home: If you work from home, you can claim a flat-rate allowance based on the number of hours you work from home each month. For the 2023-2024 tax year, the rates are as follows:

    • 25 to 50 hours per month: £10

    • 51 to 100 hours per month: £18

    • More than 100 hours per month: £26


Simplified expenses can make calculating allowable expenses easier, especially for small business owners who don't want to track every individual expense.


4. National Insurance Contributions for the Self-Employed

In addition to income tax, self-employed individuals are required to pay National Insurance Contributions (NICs). There are two types of NICs that may apply:


  • Class 2 NICs: Payable if your profits are over £12,570 (for the 2023-2024 tax year). The rate is a flat £3.45 per week.

  • Class 4 NICs: Payable if your profits are over £50,270. The rate is 9% on profits between £12,570 and £50,270 and 2% on any profits above £50,270.


These contributions are paid alongside your income tax when you file your self-assessment tax return. It's crucial to account for them when calculating your total tax liability.


5. Making Tax Digital (MTD)

The UK government is gradually rolling out Making Tax Digital (MTD), a scheme designed to simplify tax reporting through digital means. Although MTD has so far been focused on VAT, it is expected that from 2026, MTD will be mandatory for all self-employed individuals with an annual income above £50,000. From 2027, it will apply to all self-employed individuals with income over £30,000.


Under MTD, self-employed individuals will need to:

  • Keep digital records of their income and expenses.

  • Use MTD-compatible software to submit quarterly updates to HMRC.

  • Submit a final annual declaration through the software.


Being aware of these future requirements can help self-employed individuals plan ahead and transition smoothly when MTD becomes mandatory.


Landlords: Filing Self-Assessment for Rental Income

If you receive income from renting out property in the UK, you are required to declare it on your self-assessment tax return. Whether you rent out a single property or manage multiple rental properties, you must report all rental income and claim allowable expenses to reduce your tax liability.


1. Reporting Rental Income

Landlords must report all rental income from residential, commercial, or furnished holiday lettings. This includes:


  • Rent payments from tenants.

  • Payments for utilities or services provided to tenants.

  • Income from any additional services, such as laundry or cleaning.


If you share ownership of the rental property with someone else, such as a spouse or partner, you only need to declare your share of the rental income.


2. Allowable Expenses for Landlords

As a landlord, you are allowed to deduct certain expenses from your rental income before calculating your tax liability. These expenses include:


  • Maintenance and repairs: Costs incurred for repairing or maintaining the property can be deducted. However, improvements that increase the value of the property, such as adding an extension, are considered capital expenses and cannot be deducted.

  • Mortgage interest: Landlords used to be able to claim full mortgage interest as a deductible expense. However, the UK government has phased out this relief, and now landlords receive a 20% tax credit instead.

  • Letting agent fees: If you use a letting agent to manage your property, their fees are deductible as an allowable expense.

  • Council tax and utility bills: If you pay these costs on behalf of your tenants, you can deduct them from your rental income.


It’s important to keep accurate records of all expenses related to the property to ensure that you claim the correct amount of relief.


3. Rent-a-Room Scheme

If you rent out a room in your home, you may qualify for the Rent-a-Room Scheme, which allows you to earn up to £7,500 per year tax-free. If your rental income exceeds this amount, you must declare it on your self-assessment tax return. The Rent-a-Room Scheme is a popular option for individuals who take in lodgers or offer spare rooms as short-term rentals through platforms like Airbnb.


4. Capital Gains Tax on Property Sales

If you sell a rental property, you may be liable for Capital Gains Tax (CGT). The tax is payable on the profit you make from the sale of the property, minus any allowable expenses such as solicitor fees, estate agent fees, and improvements made to the property.


The CGT rates for 2023-2024 are:

  • 18% for basic-rate taxpayers.

  • 28% for higher-rate taxpayers.


Landlords should report the sale of a property and any CGT liability on their self-assessment tax return. It’s essential to keep records of the property’s purchase price, selling price, and any costs associated with the sale.


Individuals with Foreign Income: Navigating Self-Assessment

If you have foreign income, you must report it on your self-assessment tax return. Foreign income can come from various sources, including:


  • Overseas investments: Interest, dividends, and capital gains from foreign stocks or savings accounts must be declared.

  • Property abroad: If you own and rent out property in another country, the rental income must be reported.

  • Foreign pensions: Pension payments from overseas pension schemes are taxable in the UK.


1. Declaring Foreign Income

The UK has agreements with many countries to avoid double taxation. This means that if you’ve already paid tax on your foreign income in another country, you can often claim tax relief in the UK. When completing your self-assessment tax return, you must:


  • Declare the gross amount of your foreign income.

  • Report any foreign tax paid.

  • Claim relief under the double taxation treaty where applicable.


2. Foreign Income Exemptions

Some individuals qualify for non-domiciled status, which allows them to pay tax only on their UK income. Non-domiciled individuals can choose to be taxed on the remittance basis, meaning they only pay UK tax on income and gains brought into the UK. However, non-domiciled status comes with certain restrictions, and the tax rules surrounding it can be complex. It's advisable to seek professional advice if you think this may apply to you.


3. Foreign Tax Credits

To avoid double taxation, you can claim foreign tax credits for tax you’ve already paid on your foreign income. These credits reduce your UK tax liability and are calculated on a case-by-case basis, depending on the amount of foreign tax paid and the relevant double taxation treaty.



Penalties, Common Mistakes, and Tips for Compliance

Having explored the specific requirements for self-employed individuals, landlords, and those with foreign income in the previous sections, this part of the article will focus on the potential penalties for non-compliance, common mistakes taxpayers make during the self-assessment process, and tips for staying compliant with HM Revenue and Customs (HMRC). Understanding the consequences of non-compliance and learning how to avoid pitfalls can save you time, money, and stress.


Penalties for Late Submission and Payment

One of the most significant concerns for UK taxpayers is the possibility of penalties if they miss key self-assessment deadlines. HMRC has a strict penalty regime for both late returns and late payments. Here’s an overview of the potential penalties you could face if you fail to meet your obligations.


1. Late Filing Penalties

The penalties for late filing of a self-assessment tax return are automatic and increase the longer the delay. For the 2023-2024 tax year, the penalties are as follows:


  • Initial penalty: £100 if your tax return is late, even if you don’t owe any tax.

  • Three months late: £10 for each day the return is late, up to a maximum of £900.

  • Six months late: The greater of 5% of the tax due or £300.

  • Twelve months late: The greater of 5% of the tax due or £300, with additional penalties in cases where HMRC believes you are deliberately withholding information.


It’s important to note that these penalties apply to both online and paper returns, so missing either the 31 October deadline for paper submissions or the 31 January deadline for online submissions can lead to substantial fines.


2. Late Payment Penalties

In addition to penalties for late filing, HMRC imposes penalties for late payment of any tax owed. The late payment penalties for the 2023-2024 tax year are:


  • 30 days late: 5% of the tax unpaid at that date.

  • Six months late: A further 5% of the unpaid tax.

  • Twelve months late: Another 5% of the unpaid tax.


Interest is also charged on any unpaid tax from the day it is due until the day it is paid. The current interest rate, as of September 2024, is 6.75%. This interest charge applies in addition to any penalties.


3. Penalties for Incorrect Returns

Submitting an inaccurate tax return can also lead to penalties. HMRC may penalize you if they believe you have been careless, deliberately submitted inaccurate information, or attempted to evade tax. Penalties for inaccuracies are calculated based on the amount of tax underpaid as a result of the error and the behavior that caused the error:


  • Careless mistakes: Up to 30% of the tax due.

  • Deliberate but not concealed: Up to 70% of the tax due.

  • Deliberate and concealed: Up to 100% of the tax due.


If you discover an error in your return after submitting it, you can correct it within 12 months of the original filing deadline without incurring penalties. This is known as making an amendment to your tax return. If HMRC discovers the error first, however, penalties are more likely to apply.


4. Appealing a Penalty

If you receive a penalty notice from HMRC but believe you had a reasonable excuse for missing a deadline or submitting incorrect information, you can appeal the penalty. A reasonable excuse could include situations such as:


  • A serious illness or bereavement.

  • Computer or software issues when submitting an online return.

  • Delays caused by postal service disruptions.


To appeal, you must write to HMRC or submit your appeal online, explaining your circumstances and providing any supporting evidence. HMRC will review your case and may cancel the penalty if they believe your excuse is valid.


Common Mistakes Taxpayers Make When Filing Self-Assessment

Even with the best intentions, mistakes can happen when filing a self-assessment tax return. These errors can lead to delays, penalties, or even investigations by HMRC. Here are some of the most common mistakes and how to avoid them.


1. Missing the Filing Deadline

One of the most frequent mistakes is missing the deadline for filing a tax return. As mentioned earlier, the deadlines for paper and online submissions are 31 October and 31 January, respectively. Missing these deadlines can lead to automatic penalties, even if you don’t owe any tax.


How to avoid it: Set reminders well in advance of the deadlines. If you’re waiting for documents or figures, submit a provisional return to avoid penalties, and update it later when the final information is available.


2. Incorrect or Missing UTR

Your Unique Taxpayer Reference (UTR) is essential when submitting a tax return. Entering the wrong UTR or forgetting to include it can cause processing delays or errors in HMRC’s system.


How to avoid it: Double-check that your UTR and National Insurance number are entered correctly on the tax return. These numbers are unique identifiers that help HMRC link the return to your tax records.


3. Forgetting to Declare All Income

It’s easy to overlook small amounts of income, especially if you have multiple sources, such as freelance work, rental income, or savings interest. However, failing to declare all income is considered non-compliance and can result in penalties.


How to avoid it: Keep thorough records throughout the tax year, including bank statements, invoices, and any documentation related to income. Use these records to cross-check that all income is declared on your tax return.


4. Overstating or Understating Expenses

While it’s important to claim all allowable expenses to reduce your tax liability, overstating expenses can lead to penalties if HMRC deems the claim to be excessive or false. Similarly, understating expenses could mean you end up paying more tax than necessary.


How to avoid it: Keep detailed receipts and records of all expenses, and ensure that they meet HMRC’s criteria for allowable business expenses. When in doubt, consult a tax advisor to ensure you’re claiming the correct amounts.


5. Forgetting National Insurance Contributions

Self-employed individuals often overlook their National Insurance Contributions (NICs), which are required in addition to income tax. Failing to account for Class 2 or Class 4 NICs can lead to underpayment and penalties.


How to avoid it: Use HMRC’s online calculator or commercial accounting software to include NICs when calculating your total tax liability. Make sure to account for both Class 2 and Class 4 NICs based on your profits.


6. Not Retaining Records

UK law requires taxpayers to keep records for five years after the 31 January submission deadline. Failing to retain records can lead to difficulties in providing evidence during a tax investigation or when amending a tax return.


How to avoid it: Set up a reliable system for organizing and storing your records, whether physical or digital. Ensure that you have backup copies in case of loss or damage to original documents.


Tips for Staying Compliant with HMRC

Staying compliant with HMRC requires a proactive approach to managing your finances and meeting deadlines. Here are some tips to help you stay on track and avoid the pitfalls of self-assessment.


1. Use Commercial Software

Using commercial tax software can simplify the self-assessment process, especially if you have multiple sources of income or complex financial arrangements. Many software programs are compatible with HMRC’s systems and can automatically calculate your tax liability, flag errors, and remind you of deadlines.


2. Seek Professional Advice

If you’re unsure about any aspect of your self-assessment tax return, it’s worth seeking advice from a qualified accountant or tax advisor. They can help ensure that your return is accurate and that you’re claiming all the reliefs you’re entitled to. While hiring a professional is an added cost, it can save you from costly mistakes and penalties.


3. Keep Digital Records

With the introduction of Making Tax Digital (MTD), it’s becoming increasingly important to maintain digital records of your income and expenses. Using digital tools not only helps with compliance but also simplifies the process of completing your tax return.


4. Plan for Tax Payments

If you know you will have a large tax bill at the end of the tax year, plan ahead by setting aside money each month. This will help you avoid cash flow problems when the payment deadline arrives. You can also make voluntary payments on account to reduce the amount due at the end of the year.


5. Monitor Changes in Tax Law

Tax laws and HMRC regulations can change from year to year. Stay informed about any updates or changes that may affect your self-assessment obligations. For example, changes to allowable expenses, National Insurance thresholds, or the introduction of Making Tax Digital can all impact how you complete your return.


How Can a Tax Accountant Help You with Submitting Self-Assessment Tax Returns


How Can a Tax Accountant Help You with Submitting Self-Assessment Tax Returns

Submitting self-assessment tax returns can be a daunting task for many taxpayers in the UK, especially for those with complex financial situations or limited experience in handling tax affairs. The process involves accurately reporting income, claiming allowable expenses, calculating tax liabilities, and meeting strict deadlines. Any mistakes can lead to penalties or even investigations by HM Revenue and Customs (HMRC). This is where a tax accountant can provide valuable assistance. In this article, we will explore how a tax accountant can help you with the self-assessment process, ensuring accuracy, compliance, and efficiency while minimizing the risk of errors and penalties.


1. Expert Knowledge of Tax Laws and Regulations

The UK tax system is highly complex, with constantly changing laws, regulations, and allowances that affect how much tax you owe and how to report your income. A tax accountant has in-depth knowledge of the current tax laws and regulations, ensuring that your self-assessment tax return is accurate and compliant with HMRC’s requirements.


Keeping Up with Changes

One of the most significant advantages of hiring a tax accountant is their ability to stay up-to-date with changes in tax legislation. For instance, tax reliefs, deductions, and thresholds change regularly, and keeping track of these updates is crucial for accurate filing. A tax accountant will ensure that you are claiming the correct allowances and tax reliefs, such as those for pension contributions, charitable donations, and business expenses.


For individuals who are self-employed, landlords, or have foreign income, the rules can be even more complicated. A tax accountant’s expertise helps you navigate the specific regulations that apply to your situation, ensuring that you don’t miss out on any benefits or reliefs to which you are entitled.


2. Ensuring Accuracy in Financial Reporting

Filing a self-assessment tax return involves providing detailed and accurate information about your income, expenses, and any other financial activity. Errors in these figures can lead to penalties or investigations by HMRC. A tax accountant can help ensure that all your financial information is reported accurately, reducing the likelihood of mistakes.


Avoiding Common Errors

One of the most common mistakes people make when filing their self-assessment tax returns is misreporting income or forgetting to declare additional sources of income, such as interest on savings, rental income, or dividends from investments. A tax accountant can ensure that all income is properly accounted for, helping to avoid underpayment of tax, which could result in penalties.


Similarly, mistakes in claiming allowable expenses are another frequent error. If you are self-employed or running a small business, determining which expenses are allowable can be challenging. A tax accountant will ensure that only legitimate expenses are claimed, maximizing your tax deductions while avoiding any overstatements that could raise red flags with HMRC.


3. Maximizing Tax Reliefs and Deductions

One of the key benefits of working with a tax accountant is their ability to maximize your tax reliefs and deductions, potentially saving you a significant amount of money. Many taxpayers are unaware of the various reliefs available to them, or they may not know how to claim them correctly. A tax accountant will carefully analyze your financial situation to ensure you are taking full advantage of all applicable reliefs and deductions.


Claiming Business Expenses

For self-employed individuals and small business owners, claiming business expenses is an essential part of reducing taxable income. A tax accountant will help you identify all allowable expenses, such as office costs, travel expenses, marketing costs, and professional fees. Additionally, they can assist you in calculating your use of home expenses if you work from home, ensuring that you claim the correct amount.


Pension Contributions and Charitable Donations

Tax accountants also help ensure that you receive the appropriate tax relief for pension contributions and charitable donations. Contributions to approved pension schemes can be deducted from your taxable income, reducing your overall tax liability. Similarly, donations made under the Gift Aid scheme allow you to claim back some of the tax paid on your donations, which can be factored into your self-assessment return.


4. Handling Complex Tax Situations

Certain financial situations can make the self-assessment process particularly complex. Whether you have income from multiple sources, foreign investments, or are subject to capital gains tax, a tax accountant can help simplify the process and ensure that everything is reported correctly.


Dealing with Foreign Income

If you have income from abroad, such as overseas investments or rental properties, you will need to report this on your self-assessment tax return. The UK has double taxation treaties with many countries to avoid taxing the same income twice, but the rules for claiming tax relief on foreign income can be complicated. A tax accountant will ensure that foreign income is declared correctly and that any applicable relief is claimed to avoid double taxation.


Capital Gains Tax

If you have sold assets such as property, shares, or other investments, you may be liable for capital gains tax (CGT). Calculating CGT can be complex, especially when accounting for allowable deductions and exemptions. A tax accountant will calculate your gains, ensure that you claim the right reliefs, such as the annual exempt amount, and file the necessary information with HMRC.


Dividends and Investment Income

For individuals with income from dividends or investments, a tax accountant can help you navigate the rules surrounding the taxation of these income streams. They can also ensure that you’re benefiting from tax-free allowances, such as the Dividend Allowance or Personal Savings Allowance, and that any tax paid on foreign dividends is correctly offset.


5. Saving Time and Reducing Stress

Filing a self-assessment tax return can be time-consuming and stressful, especially for those unfamiliar with the process or who have complex financial affairs. By hiring a tax accountant, you can save valuable time and reduce the stress associated with tax filing.


Streamlining the Process

A tax accountant will manage the entire process for you, from gathering financial information and calculating your tax liability to submitting the return on your behalf. This ensures that your tax return is filed on time, minimizing the risk of late penalties. For busy individuals or business owners, outsourcing this task can free up time to focus on other important matters.


Preventing HMRC Investigations

One of the biggest fears for taxpayers is receiving notice of an investigation from HMRC. While HMRC conducts random checks on a small percentage of returns, filing an inaccurate or incomplete return increases the likelihood of an investigation. A tax accountant can help reduce the risk of this happening by ensuring that all information is accurate and that the return complies with HMRC’s regulations. If HMRC does inquire about your return, your tax accountant can represent you, respond to HMRC's queries, and handle any correspondence.


6. Representing You in Case of an HMRC Enquiry

If HMRC selects your tax return for an enquiry or investigation, having a tax accountant on your side can be invaluable. A tax accountant can help you prepare for the enquiry by ensuring that all documentation is in order and by representing you in dealings with HMRC. They can also help resolve any issues that arise during the investigation, potentially saving you from fines or additional tax liabilities.


Peace of Mind During Enquiries

Having a professional represent you during an enquiry can provide peace of mind, as they will know how to handle HMRC’s questions and requests for additional information. A tax accountant can also negotiate on your behalf, ensuring that the matter is resolved as quickly and smoothly as possible.


A tax accountant can provide significant benefits when it comes to submitting self-assessment tax returns in the UK. From ensuring accuracy and compliance with tax laws to maximizing tax reliefs and deductions, a tax accountant's expertise can save you time, money, and stress. Whether you have simple or complex tax affairs, working with a tax accountant can help you avoid costly mistakes, reduce the risk of penalties, and ensure that your tax return is submitted on time and accurately.



FAQs


Q: Can you file your self-assessment tax return after the deadline without a penalty?

A: No, filing after the deadline will result in an automatic £100 penalty, even if you don’t owe any tax.


Q: Is there a grace period after the self-assessment tax return deadline?

A: No, there is no grace period. Penalties apply from the day after the deadline.


Q: Can you submit a self-assessment tax return for previous tax years?

A: Yes, but if the deadline has passed, you may incur penalties and interest for late submission and payment.


Q: How do you know if you need to file a self-assessment tax return?

A: You need to file if you have untaxed income, such as self-employment income, rental income, or income from investments.


Q: Can a tax accountant help reduce penalties if you file your self-assessment late?

A: Yes, a tax accountant can help you appeal penalties if you have a reasonable excuse for late submission.


Q: What happens if you don’t pay your self-assessment tax on time?

A: You will incur late payment penalties and interest charges on the unpaid tax.


Q: Can you pay your self-assessment tax bill in installments?

A: Yes, you can arrange a Time to Pay plan with HMRC if you cannot pay your tax bill in full by the deadline.


Q: Are penalties the same for paper and online self-assessment tax returns?

A: Yes, the same penalty regime applies for both paper and online submissions if filed late.


Q: How do you appeal a penalty for late self-assessment submission?

A: You can appeal by submitting a reasonable excuse online or by post to HMRC, with supporting evidence.


Q: What are provisional figures in a self-assessment tax return?

A: Provisional figures are estimates used when exact figures are not available before the filing deadline.


Q: Can you amend your self-assessment tax return after submitting it?

A: Yes, you can amend your return within 12 months of the filing deadline.


Q: How long do you need to keep your financial records for self-assessment?

A: You must keep records for at least five years after the 31 January submission deadline.


Q: Can HMRC extend the self-assessment filing deadline for you?

A: HMRC may extend your deadline if they delayed sending your return, but this is uncommon.


Q: What happens if you make a mistake on your self-assessment tax return?

A: You can correct mistakes by amending your tax return within 12 months of the original deadline.


Q: Can you file a self-assessment tax return if you haven’t registered with HMRC?

A: No, you must first register for self-assessment to receive your Unique Taxpayer Reference (UTR).


Q: How do you register for self-assessment for the first time?

A: You can register online through HMRC’s website by providing your personal details and business information.


Q: What is the penalty if your self-assessment return is three months late?

A: You will be charged £10 per day, up to a maximum of £900, in addition to the initial £100 penalty.


Q: Can you file a paper self-assessment tax return if you miss the online deadline?

A: No, the deadline for paper submissions is earlier, and you cannot submit a paper return after the online deadline.


Q: Are there penalties for submitting an inaccurate self-assessment tax return?

A: Yes, HMRC can impose penalties based on the severity of the inaccuracy, ranging from 0% to 100% of the unpaid tax.


Q: How do you know if HMRC has received your self-assessment tax return?

A: HMRC will send an email acknowledgment if you file online. If you submit by post, you can check your HMRC account or call them.


Q: Can you claim tax relief for errors made by HMRC in your tax return?

A: Yes, if HMRC makes an error, you can request a correction and potential tax relief if it resulted in an overpayment.


Q: Can you backdate a tax return for years you missed?

A: You can submit late returns, but penalties and interest may apply for each year missed.


Q: Can you file your self-assessment tax return without knowing your exact income?

A: Yes, you can file using provisional figures, but you must update them with actual figures later.


Q: What is the time limit for HMRC to investigate your tax return?

A: HMRC can investigate your tax return within 12 months of the submission date if they believe there are errors.


Q: Can you get a refund from HMRC if you overpay tax on your self-assessment return?

A: Yes, if you overpay, HMRC will issue a refund once the return is processed.


Q: What should you do if you cannot file your tax return on time due to illness?

A: Contact HMRC as soon as possible to inform them, as this may be considered a reasonable excuse for late filing.


Q: Can you file a self-assessment tax return on behalf of someone who has died?A: Yes, the executor of the estate must file a tax return for the deceased for the tax year in which they died.


Q: Can you file your tax return using commercial tax software?

A: Yes, you can file your return using HMRC-recognized commercial software, especially if you have complex finances.


Q: Can you change your self-assessment tax return submission from paper to online?

A: Yes, you can switch to online submission, but ensure it’s done before the respective deadlines.


Q: Can you claim expenses without receipts in your self-assessment tax return?

A: No, you must keep receipts and records for any business expenses you claim.


Q: Can HMRC take the tax you owe from your wages or pension?

A: Yes, if you owe less than £3,000 and file online by 30 December, HMRC can collect tax through your wages or pension.


Q: Can you file a self-assessment return if you don’t live in the UK?

A: Yes, non-residents with UK income must still file a self-assessment return.


Q: Can HMRC remove penalties if you miss the filing deadline due to technical issues?

A: Yes, HMRC may remove penalties if the delay was caused by technical problems with their online service.


Q: Can you reduce your payments on account if you expect lower income next year?

A: Yes, you can request to reduce payments on account if you believe your income will be lower than the current year.


Q: Can you file your tax return without a Unique Taxpayer Reference (UTR)?

A: No, you need a UTR to file your self-assessment tax return, which you receive when registering with HMRC.


Q: Can you include charitable donations in your self-assessment tax return?

A: Yes, you can claim tax relief on charitable donations made under the Gift Aid scheme.


Q: How do you check the status of your self-assessment tax refund?

A: You can check the status of your refund by logging into your HMRC online account or calling their helpline.


Q: Can you file your self-assessment tax return if you’ve already paid tax through PAYE?

A: Yes, you must still file if you have other untaxed income, even if you've paid tax through PAYE on your employment income.


Q: Can you file a self-assessment return early?

A: Yes, you can file your return as soon as the tax year ends on 5 April, and HMRC encourages early filing to avoid penalties.


Q: Can you get help from HMRC with filing your self-assessment tax return?

A: Yes, HMRC offers guidance through their website, helpline, and support for those needing assistance with their tax return.


Disclaimer:

 

The information provided in our articles is for general informational purposes only and is not intended as professional advice. While we strive to keep the information up-to-date and correct, Pro Tax Accountant makes no representations or warranties of any kind, express or implied, about the completeness, accuracy, reliability, suitability, or availability with respect to the website or the information, products, services, or related graphics contained in the articles for any purpose. Any reliance you place on such information is therefore strictly at your own risk.

 

We encourage all readers to consult with a qualified professional before making any decisions based on the information provided. The tax and accounting rules in the UK are subject to change and can vary depending on individual circumstances. Therefore, Pro Tax Accountant cannot be held liable for any errors, omissions, or inaccuracies published. The firm is not responsible for any losses, injuries, or damages arising from the display or use of this information.







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