Self Assessment
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Self Assessment
Who must file, what to include, key deadlines, and how to avoid late-filing penalties.
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UK self-assessment deadlines and penalties
The UK Self Assessment online return is due by 31 January following the end of the tax year. Miss it by even one day and the penalty is £100, regardless of whether tax is owed. Daily and percentage penalties compound for longer delays.
MTD for Income Tax: what you need to know
Making Tax Digital for Income Tax (MTD ITSA) requires UK self-employed individuals and landlords with annual income over £50,000 to keep digital records and submit quarterly updates to HMRC, starting 6 April 2026. The threshold drops to £30,000 from April 2027.
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