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Use supplementary pages SA109 to record your residence and domicile status on your SA100 Tax Return.
This applies to customers who have to submit a Self Assessment tax return through a notice to file.
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.
Use supplementary pages SA103F to record self-employment income on your SA100 Tax Return if your annual turnover was above the VAT threshold for the tax year.
Find out how much you need to put aside for your Self Assessment tax bill if you're self-employed by using HM Revenue and Customs' (HMRC's) self-employed tax calculator.
How to report profit on your Self Assessment tax return from 2023 to 2024 if your accounting year does not end on or between 31 March to 5 April.
Guidance, forms and helpsheets for self-employment. Including setting up your business, filing returns, claiming expenses and how to get help and support.
Use supplementary pages SA107 to record income you received from a trust, settlement or deceased person's estate on your SA100 tax return.
Find out what to do if you need to pay back some or all of a SEISS grant.
Check how to register and file your Self Assessment tax return, apply to reduce payments and find information on keeping records.
Form and guidance on self-certification for manufacturers of video surveillance systems (VSS).
Use supplementary pages SA101 to record less common types of income, deductions and tax reliefs on your SA100 Tax Return.
Use supplementary pages SA102M to record employment income on your SA100 tax return if you're a clergyman or a minister of religion.
Check how much you were paid for SEISS and how to repay an overpaid grant.
Find helpsheets, forms and notes to help you fill in the self-employment and partnership pages of your Self Assessment tax return.
Use supplementary pages SA102MS to record employment income on your SA100 Tax Return if you're a member of the Senedd Cymru — Welsh Parliament.
Use this tool to find out if you need to send a tax return for the 2023 to 2024 tax year (6 April 2023 to 5 April 2024).
Find guidance to help decide the employment status of a worker, including employment intermediaries.
Use supplementary pages SA102 to record employment income on your SA100 Tax Return.
Don’t include personal or financial information like your National Insurance number or credit card details.
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