UK Filing Deadline Calculator
Enter your financial year end and company type to get your estimated Companies House accounts deadline and HMRC CT600 deadline — both regulators, one calculation.
This is an estimate for planning purposes, not a substitute for confirming your exact dates with HMRC, Companies House, or your accountant — it doesn't account for extensions or a company's first accounting period, which uses a different 21-month rule. See our insights for the detail.
Know your deadline. Now get your accounts tagged right.
Whichever deadline is closer, we can turn your accounts into filing-ready iXBRL — typically within 24 hours.
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Check our FAQ, or send us a message directly — we're happy to talk through your accounts.
Read the FAQFrequently asked questions
Are these deadlines exact, or estimates?
Estimates for planning purposes. They don't account for extensions, non-standard accounting periods, or a company's first accounting period (which uses a different 21-month rule for Companies House). Always confirm your exact dates with HMRC, Companies House, or your accountant.
Why does the calculator ask for company type?
Companies House gives public companies 6 months to file accounts, versus 9 months for private companies — the calculator applies whichever applies to you.
What if this is our company's first year?
This calculator doesn't apply the 21-month first-accounts rule — see our startups guide for your first-year timeline instead.