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Use this technical documentation for individual returns if you're a software developer working with the Self Assessment online service.
Use supplementary pages SA107 to record income you received from a trust, settlement or deceased person's estate on your SA100 tax return.
Get help, support and guidance with filling in your Self Assessment tax return.
Evaluation of 2 trials that changed how HMRC supported Self Assessment customers in the 2023 to 2024 tax year.
These manuals contain guidance on Self Assessment.
Use supplementary pages SA102MP to record employment income on your SA100 Tax Return if you're a Member of Parliament (MP) or a minister.
Registering for Self Assessment is an essential requirement for people with an untaxed income.
Fill in the Lloyd's underwriters pages of your Self Assessment tax return using these helpsheets, forms and notes.
A warning to Self Assessment customers who may be targeted by criminals.
Customers have just 100 days remaining to file their Self Assessment tax return for the 2022 to 2023 tax year.
Taxpayers who are unsure if they need to submit a Self Assessment tax return can use HMRC's online tool to help them work out what they need to do.
More customers than ever use HMRC's app to pay their Self Assessment tax bill.
Use supplementary pages SA104F to record full partnership income on your SA100 tax return.
Check the availability and any issues affecting the Self Assessment: paying HMRC online service.
Self Assessment, PAYE and Income Tax subject headings for agents' letters to HM Revenue and Customs on behalf of clients.
Register a new partnership for Self Assessment using form SA400.
Don’t include personal or financial information like your National Insurance number or credit card details.
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