Search all content on GOV.UK

Self Assessment tax returns - deadlines, who must send a tax return, penalties, corrections and returns for someone who has died.

• Overview

  Self Assessment is a system HM Revenue and Customs (HMRC) uses to collect…

• Who must send a tax return

  You must send a tax return if, in the last tax year (6 April to 5 April),…

• Registering for Self Assessment

  You must register for Self Assessment by 5 October if you need to complete…

• Sending a return

  You can send a tax return by either: submitting an online return sending a…

• If you no longer need to send a tax return

  You must tell HMRC as soon as possible if you believe you no longer need…

• Deadlines

  HM Revenue and Customs (HMRC) must receive your tax return and any money…

• Penalties

  You’ll get a penalty if you need to complete a tax return and you: send…

• If you need to change your return

  You can make a change to a tax return after you filed it, for example…

• Claiming a tax refund

  You may be able to get a tax refund (also known as a ‘repayment’ or…

• How to get help

  If you need help with Self Assessment, you can: appoint someone to fill in…

• Returns for someone who has died

  If you’re the ‘personal representative’ (an executor or administrator) for…

Sign in and send your Self Assessment tax return online.

Use this tool to find out if you need to send a tax return for the 2024 to 2025 tax year (6 April 2024 to 5 April 2025).

Understand your Self Assessment tax bill - your tax calculation, statement, balancing payments, payments on account.

How to report your income and claim tax reliefs and any repayment due to you using the SA100 tax return.

How to register for Self Assessment if you need to send a tax return or want to make voluntary Class 2 National Insurance payments.

Payment options for your Self Assessment tax bill - Direct Debit, bank transfer, through your tax code, debit or credit card, cheque and pay weekly or monthly

Self Assessment tax return forms for the current tax year

Includes filing, deadlines, pay and tax records

• Updated: 21 December 2022

Nearly 300,000 customers file their Self Assessment tax return for the 2024 to 2025 tax year at earliest opportunity.

• Updated: 7 May 2025