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Company accounts and tax deadline calculator
Enter your year end to see every filing date for your limited company.
At a glance
- Accounts: 9 months after year end
- First accounts: 21 months after registration
- Tax return: 12 months after period end
- Corporation Tax: 9 months and 1 day after
Find your dates
Enter your financial year end.
- Companies HouseAnnual accounts duePick a date
- HMRCCorporation Tax payment duePick a date
- HMRCCompany Tax Return (CT600) duePick a date
Standard dates for an established private company. First accounts are due 21 months after the company was registered.
Late accounts penalties
Private companies, charged by Companies House
Penalties double if your accounts are late two years in a row.
Sources: GOV.UK annual accounts and GOV.UK Corporation Tax. Checked 6 November 2026.
How to use the calculator
Enter the last day of your financial year, also called your accounting reference date. The calculator then shows when your accounts, your Company Tax Return and your Corporation Tax payment are due.
If you are not sure of your year end, check your last filed accounts or your Companies House record. It is the date your accounts are made up to.
The dates explained
- Annual accounts at Companies House: 9 months after the financial year end.
- First accounts: 21 months after the date the company was registered.
- Company Tax Return to HMRC: 12 months after the end of the accounting period.
- Corporation Tax payment: 9 months and 1 day after the end of the accounting period.
Notice that the tax payment date is earlier than the tax return date. Many directors miss this and pay late.
A worked example
Imagine a company with a 31 March year end. Its accounts are due by 31 December of the same year. Its Corporation Tax is due by 1 January, which is 9 months and 1 day after the year end. Its Company Tax Return is due by 31 March the following year.
The calculator above does this arithmetic for you for any year end.
What happens if you miss a date
Late accounts at Companies House bring automatic penalties of £150, £375, £750 or £1,500 for a private company, depending on how late they are. The penalty doubles if the company is late two years in a row.
Missing the tax dates also has consequences with HMRC. If you are already late, see our late accounts filing service, or read the guide to late filing penalties.
How to never miss a date again
We set up your dates when you order and file everything on time. Our micro-entity accounts service covers your accounts and tax return, and our confirmation statement service keeps your yearly Companies House check-in up to date.
Related services and tools
Next steps for your company.
Micro-entity accounts
FRS 105 accounts and your tax return, filed for you.
£399 + VAT up to £100K turnover
First-year accounts
Your first accounts, due 21 months after registration.
£399 + VAT up to £100K turnover
Deadline FAQs
Straight answers to common questions.
When are company accounts due?
Nine months after the financial year end for a private company. Your first accounts are due 21 months after registration.
When is the Company Tax Return due?
Twelve months after the end of the accounting period it covers.
When must I pay Corporation Tax?
Nine months and one day after the end of the accounting period.
What is the penalty for late accounts?
From £150 up to £1,500 for a private company, depending on how late the accounts are. It doubles if late two years in a row.
How do I find my year end?
Check your last accounts or your Companies House record. It is the date your accounts are made up to.
Want us to handle every date?
We file your accounts and tax return and keep you on schedule.