Many people wonder who needs to file a UK tax return, especially if they have multiple income sources or live abroad. Unlike other countries, not every individual is required to file a UK tax return. Only those meeting certain criteria have to file, typically individuals with additional untaxed income or gains to declare, or those wanting to claim additional UK tax relief.
This guide explains who needs to file a UK tax return, the self-assessment registration process, and the relevant deadlines to ensure your tax return filing obligations are met. Penalties and interest may be charged for failure to notify HMRC of your requirement to file a tax return and for late filing of the tax return itself so early identification of your requirements is crucial.
If you would like to discuss who needs to file a UK tax return and whether this applies to you, please contact us at Expat Tax Solutions.
Who Needs To File A UK Tax Return?
Many people wonder who needs to file a UK tax return, especially if they have multiple income sources or live abroad. Most individuals are not required to file UK tax returns.
UK based employees with salaries subjected to PAYE tax withholding and minimal other sources of income (interest, dividends etc.) are not likely required to file a UK tax return. Historically, individuals with UK taxable income above £100,000 were required to file UK tax returns however this is no longer the case.
Additional Income To Declare
Knowing who needs to file a UK tax return can help you plan ahead and avoid last-minute stress. The most common filing requirement arises from the need to declare additional UK taxable income. You need to file a UK tax return if you were in receipt of any of the following sources of income during the tax year:
- Rental income over £1,000
- Rental income from a room in your house above the £7,500 Rent A Room Relief limit
- Self-employment income over £1,000
- Dividend or interest income over £10,000
- Foreign income
- Income from a trust
- Capital gains in excess of the Annual Exemption (£3,000)
- Child benefit and your taxable income exceeds £60,000
Claiming UK Tax Relief
You may also be required to file a UK tax return to claim UK tax relief on the following items:
- Over £2,500 worth of business expenses
- Foreign tax credits under a Double Taxation Agreement
- Foreign income received by a UK tax non-resident
- Personal pension contributions for higher/additional rate taxpayers
- Gift Aid charitable donations for higher/additional rate taxpayers
- The Marriage Allowance
- Tax efficient investments (EIS/SEIS/VCT)
Other Reasons
You will also be required to file a UK tax return if you are:
- An off-payroll worker
- Wanting to claim the Foreign Income and Gains (FIG) Regime
- A partner in a business partnership
- Subject to the Annual Allowance Charge for pensions
- Wanting to pay voluntary national insurance contributions
You can check who needs to file a UK tax return using HMRC’s questionnaire here.
How To Register For Self-Assessment
UK self-assessment tax return registration should be completed by 5 October following the end of the tax year.
The registration deadline for the 2025/26 UK tax year (6 April 2025 – 5 April 2026) is therefore 5 October 2026.
Most individuals can register online via HMRC’s website here.
UK Tax Return Filing and Payment Deadline
Alongside knowing who needs to file a UK tax return, it is equally important to know when you need to file your UK tax return.
The UK tax return filing deadline is the later of:
- 31 January following the end of the tax year; and
- 3 months after you register for self-assessment
The typical deadline to file 2025/26 UK tax returns is therefore 31 January 2027.
If you wish to file a paper tax return (as opposed to the more common online filing), the deadline to file is 31 October after the end of the tax year (31 October 2026 for 2025/26).
Irrespective of when your tax return is filed, the deadline to pay your outstanding tax liability is 31 January following the end of the tax year
If you owe tax and you wish to pay this via your tax code rather than directly to HMRC, you must file your tax return by 31 December following the end of the tax year.
Late Tax Return Filing and Payment Penalties
Understanding who needs to file a UK tax return is essential to avoid penalties and stay compliant with HMRC rules.
What if I file my tax return late?
HMRC will levy the following penalties if your tax return is filed late:
- £100 if filed after 31 January 2027
- £10 per day until the tax return is filed or for a maximum of 90 days (up to £900) if the return is 3 months late.
- The higher of £300 or 5% of the tax liability if filed 6 months late
- The higher of £300 or 5% of the tax liability if filed 12 months late
What if I settle my tax bill late?
HMRC will levy the following penalties if your tax bill is paid late:
- 5% of the tax liability if 30 days late
- 5% of the tax liability if 6 months late
- 5% of the tax liability if 12 months late
They will also charge interest from 31 January 2027 at the Bank of England Base Rate plus 4%.
More information can be found at: https://www.gov.uk/self-assessment-tax-returns/penalties
Who Needs To File A UK Tax Return FAQs
Who needs to file a UK tax return?
You will typically need to file a UK tax return if you have UK taxable income that you need to pay tax on, or if you want to claim certain UK tax reliefs.
Do expats need to file a UK tax return?
Expats are typically required to file UK tax returns as they commonly have foreign income, are UK tax non-resident, or want to claim double taxation relief.
If you are UK tax non-resident with no UK sourced income then you may not be required to file a UK tax return however you should notify HMRC of this and de-register from self-assessment.
Can I pay my UK tax without filing a UK tax return?
If your only source of income is employment/pension income subject to PAYE or your total savings income is below the Personal Savings Allowance, you may not be required to file a tax return.
It may also be possible to pay UK tax on your investment income via your tax code instead of filing a UK tax return.
When do I need to file my tax return by?
The UK tax return filing deadline is 31 January following the end of the tax year.
The 2025/26 UK tax return filing deadline is therefore 31 January 2027.
Get Expert Help With Filing Your UK Tax Return
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