UK Self Assessment Deadline: What You Need to Submit by January 31
The UK Self Assessment deadline falls on 31 January every year, and it applies to millions of self-employed individuals, freelancers, landlords, and higher-rate taxpayers across the country. If you need to file a Self Assessment tax return for the 2025/26 tax year, 31 January 2027 is your final date to both submit your return online and pay any tax you owe. Miss it, and you’ll face automatic penalties – even if you owe nothing.
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