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

• Overview

  When you submit a Self Assessment tax return, you’ll get a: Self…

• Self Assessment statement

  Your Self Assessment statement shows: the tax you owe at the time the…

• Tax calculation (SA302)

  Your tax calculation (SA302) shows: your total income on which tax is due…

• Payments on account

  ‘Payments on account’ are payments towards your next tax bill (including…

Get help with Self Assessment by using online tools and helpsheets, watching YouTube videos or asking the digital assistant or community forums a question.

• Updated: 22 January 2025

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 send a tax return and you miss the…

• 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…

CHP Scheme. Complete Self-Assessment form F4 for existing schemes 2MWe or over and F4(S) for schemes under 2MWe

When you may need to make a change to your Self Assessment tax return for SEISS payments, and how to do it.

• Updated: 20 September 2023

Use supplementary pages SA103S to record self-employment income on your SA100 tax return if your annual business turnover was below the VAT threshold for the tax year.

The ethics self-assessment process aims to offer researchers an easy-to-use framework to review the ethics of their projects throughout the research cycle.

• Updated: 29 January 2025

• Updated: 24 October 2023

Find out how to do a rapid lateral flow test for COVID-19. Rapid lateral flow tests show the result on a device that comes with the test.

• Updated: 30 April 2024

Use form SA1 to register for Self Assessment for any reason other than self-employment.

• Updated: 6 April 2025