Self Assessment tax returns

Self Assessment is a system HM Revenue and Customs (HMRC) uses to collect Income Tax.

Tax is usually deducted automatically from wages and pensions. People and businesses with other income must report it in a Self Assessment tax return.

If you need to send a Self Assessment tax return, fill it in after the end of the tax year (5 April) it applies to.

Sending your return

You can file your Self Assessment tax return online.

If you need a paper form you can download or request other forms.

Deadlines

You must tell HMRC by 5 October if you need to complete a tax return for the previous year. Check the deadlines.

Filling in your return

You need to keep records so you can fill in your tax return correctly. Get help filling in your return.

Paying your bill

HMRC will calculate what you owe based on what you report. Pay your Self Assessment bill by 31 January.

Cryptoassets

If you hold, sell or swap cryptoassets you may need to report them. Find out about cryptoassets and Self Assessment, or check your cryptoassets.