UK · Companies House & HMRC
Company filing deadline checker.
Enter your accounting period end and incorporation date to see when accounts, the confirmation statement, Corporation Tax and the Company Tax Return are due.
Rules read from GOV.UK on 30 September 2026. Runs on this device; nothing is sent or saved.
Your company
Your deadlines
Enter an accounting period end and press Show deadlines.
Worked example
A private company incorporated on 15 March 2020 with a 31 December 2025 year end and a last confirmation statement dated 15 March 2026: accounts are due 30 September 2026 (9 months), Corporation Tax is payable by 1 October 2026 (9 months and 1 day), the Company Tax Return is due 31 December 2026 (12 months), and the next confirmation statement review period ends 15 March 2027, so it is due by 29 March 2027.
Rules and sources
- Accounts: 9 months (private) or 6 months (public) after the accounting reference date. First accounts covering more than 12 months: 21 months (private) or 18 months (public) from incorporation, or 3 months from the accounting reference date, whichever is longer. Source: GOV.UK, Preparing and filing Companies House accounts (updated 25 September 2026).
- Corporation Tax and return: pay or tell HMRC no tax is owed within 9 months and 1 day; file the Company Tax Return within 12 months of the accounting period end. Source: GOV.UK, Prepare and file your annual accounts and Company Tax Return.
- Confirmation statement: at least every 12 months; the review period ends 12 months after incorporation or the last confirmation statement date, and you can file up to 14 days after it ends. Source: GOV.UK, Filing your company’s confirmation statement (updated 21 April 2026).
Late accounts penalty (Companies House, automatic)
| Length of delay | Private | Public |
|---|---|---|
| Not more than 1 month | £150 | £750 |
| More than 1 month, up to 3 months | £375 | £1,500 |
| More than 3 months, up to 6 months | £750 | £3,000 |
| More than 6 months | £1,500 | £7,500 |
Table as published on the GOV.UK accounts guidance above, as of 30 September 2026.
How dates are calculated
“N months after the period end” is counted as the N-month period starting the day after the period end, so 30 June gives 31 March and 31 December gives 30 September. This is our reading of the month-end convention, not wording GOV.UK spells out; the first-accounts limb counts from the incorporation date exactly as in GOV.UK’s own example. Confirm the exact date on your company’s Companies House record.
Frequently asked questions
Do the deadlines move if they fall on a weekend or bank holiday?
No. Companies House says that if an accounts deadline falls on a Sunday or bank holiday it is still a legal requirement to file by that date, so this tool does not shift dates. File earlier.
Is the confirmation statement due on the same date as accounts?
No. The confirmation statement runs on its own 12-month review period starting from incorporation (then from each confirmation statement date), and you can file up to 14 days after the period ends. Your accounts follow your accounting reference date.
Why is Corporation Tax payment a day later than 9 months?
HMRC's rule is 9 months and 1 day after the end of the accounting period, so a 31 December year end gives 1 October. The Company Tax Return itself is due 12 months after the period ends.
What if my first accounting period is 12 months or less?
Then the normal 9-month (private) or 6-month (public) limit applies. The 21-month and 18-month first-accounts rules only apply when the first accounts cover more than 12 months.
Are the penalty amounts final?
They are the automatic Companies House late-filing amounts from the GOV.UK guidance on the as-of date shown. HMRC has separate penalties for a late Company Tax Return that this tool does not calculate.
Planning aid, not advice
This tool does not model shortened or extended accounting periods, large-company Corporation Tax instalments, HMRC late-return penalties or dormant-company rules. Companies House and HMRC are the authority for your exact dates.