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Self-assessment tax return

6 articles

The complete guide to filling out your tax return, with explanations of the deadlines and what happens if you submit a late tax return.

How to fill in a self-assessment tax return

Last updated: Apr 2022

Find out how fill out HMRC's self-assessment tax return for the 2021-22 tax year, and what income you need to declare.

Tax returns 2022: important deadlines

Last updated: Apr 2022

Put these key dates for 2020-21, and 2021-22 self-assessment tax returns in your diary to avoid a penalty for missing the deadlines.

Online tax returns

Last updated: Apr 2022

Find out how to make the process of submitting your tax return online as simple as possible. 

What is a UTR number?

Last updated: Apr 2022

Find out what a unique tax reference (UTR) number is, how you can get one from HMRC, how long it will take, and what you'll need to use it for.

Paper tax returns

Last updated: Apr 2022

Find out how to complete paper tax return, plus an explanation of any supplementary pages you might need

Late tax returns and penalties for mistakes

Last updated: Apr 2022

Find out what happens if you file your tax return late, how to get help filling in your tax return, and what penalties you can face for sending HMRC incorrect information
Work out your tax bill
Use these calculators to estimate how much tax you’ll be paying this year.
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Do your tax return online with Which?
Use our jargon-free calculator to complete and securely submit your tax return direct to HMRC.
Which? tax calculator

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