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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