There are a number of reasons why a taxpayer needs to complete a Self-Assessment return. This includes if they are self-employed, a company director, have an annual income over £100,000 and / or have income from savings, investment or property.
Taxpayers that need to complete a Self-Assessment return for the first time should inform HMRC as soon as possible. The latest date that HMRC should be notified is by 5 October following the end of the tax year for which a Self-Assessment return needs to be filed.
In certain circumstances, HMRC also asks taxpayers to complete tax returns. HMRC has an online tool that can help taxpayers ascertain whether they are required to submit a Self-Assessment return.
The list of taxpayers that are likely to be required to submit a Self-Assessment return includes:
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Since 6 April 2025, the remittance basis of taxation for non-UK domiciled individuals (non-doms) has been replaced by
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