The tax return deadline for the 2024-25 tax year is 31 January 2026. Millions of people in the UK must submit their self-assessment tax returns by this date to avoid penalties. This guide covers key dates, how to prepare, and what to do if you miss the deadline.
Key Dates and Deadlines for the 2026 Tax Return
The tax return deadline for the 2024-25 tax year is 31 January 2026. This means you must complete and submit your self-assessment tax return by this date. It covers income earned between 6 April 2024 and 5 April 2025. Missing the deadline can lead to fines and interest on late payments.
HM Revenue and Customs (HMRC) usually opens additional phone lines and webchat support on the final days before the deadline, including Saturday, 31 January 2026, to help last-minute filers. But waiting until the last moment is risky — phone lines get busy and mistakes are more common.
Who Needs to File a Tax Return?
Not everyone must file a tax return. HMRC provides an online tool to check if you need to submit one. Typically, self-employed people, those with multiple income sources, or those with income not taxed at source must file.
If you have a second job as an employee, your tax is usually deducted automatically. However, if you earn extra through freelance work, casual jobs like babysitting or dog walking, property letting, or any trading, you may need to file.
Everyone has a £1,000 trading allowance per tax year. If your side income exceeds £1,000 in total for 2024-25, you must register for self-assessment and report it.
Preparing Your Tax Return
Start gathering documents early. You'll need your P60, P45, P11D, PAYE coding notices, and any tax certificates for investments.
Some of these may require contacting your employer or logging into company systems — so don’t leave this to the last minute.
HMRC offers a free app that can speed up the process. It lets you check your unique taxpayer reference, employment income details, and set payment reminders. Using the app might save you time compared to searching through paperwork or calling HMRC helplines.
Consequences of Missing the Deadline
Last year, about 1.1 million people missed the tax return deadline. HMRC warns that anyone who misses the 31 January 2026 deadline will face penalties and interest on late payments. The initial penalty is £100 even if no tax is owed.
Further fines apply if returns remain outstanding after three, six, and twelve months. Interest also accrues on unpaid tax.
Valid reasons for missing the deadline—such as serious illness or a close family bereavement—may be accepted by HMRC if supported with evidence.
HMRC Support on Deadline Day
On 31 January 2026, HMRC will extend phone and webchat services to deal with the last-minute surge. This reflects the reality that many people leave filing to the last moment. Even so, support lines can get overwhelmed.
Filing earlier reduces stress and the risk of errors. It also gives you more time to pay any tax you owe without incurring interest.
What to Do Next
If you haven't started your 2024-25 tax return, begin now. Use the HMRC app or website to gather your details and check if you need to file. Collect your paperwork today — don’t wait until the final week.
If you miss the 31 January 2026 deadline, file as soon as possible to limit penalties. Contact HMRC if you have a reasonable excuse. And remember to keep records of your income and expenses for future returns.
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The tax return deadline in the UK for the 2024-25 tax year is firmly set at 31 January 2026. Waiting until the last minute invites stress, mistakes, and financial penalties. Starting early, gathering documents, and using HMRC’s digital tools can ease the process. If you do miss the deadline, file quickly and communicate with HMRC to avoid unnecessary fines.
This article was created with AI assistance.
