For Self-Employed / Sole Traders:
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Self Assessment tax return deadline: 31 January (following the end of the tax year).
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Example: 2024–25 tax year ends 5 April 2025 → return and payment due by 31 January 2026.
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You may also need to make Payments on Account (advance tax payments in January and July).
For Limited Companies:
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Corporation Tax is due 9 months and 1 day after your company’s accounting year-end.
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Example: Year-end 31 March → Corporation Tax due 1 January.
You may also have:
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PAYE deadlines (if you employ staff)
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VAT returns (usually quarterly)
Missing deadlines results in automatic penalties and interest, so it’s vital to stay on top of it. A good accountant will track these for you and help spread out your cash flow accordingly.
