How to report your income and claim tax reliefs and any repayment due to you using the SA100 tax return, for 6 April 2025 to 5 April 2026.
You can find tax returns for 5 April 2025 or earlier.
File online
You can file your tax return online — 97% of people already do it this way.
If you file your tax return online:
- it’s easier to make amendments and more secure
- you’ll have an extra 3 months to send it to us
- you do not have to complete it all at once — you can save your details and finish it later
How to fill in your tax return
Find guidance to help you understand and fill in the sections of your Self Assessment tax return.
You can also use the guidance notes to help you fill in your tax return.
How to fill in your tax return (2026)
This file may not be suitable for users of assistive technology.
Request an accessible format.
Get supplementary pages
There are supplementary forms if you are:
There are also supplementary forms if you need to record:
If you complete a paper tax return
You’ll need to post your tax return to HMRC.
If you live in the UK send to:
If you live outside the UK send to:
HMRC must receive your paper tax return by the deadline.
If you miss the paper filing deadline, send your tax return online instead to avoid a penalty.
, 1.29 MB, 10 pages
This file may not be suitable for users of assistive technology.