For UK limited companies, compliance is not just a year-end exercise. There are a number of key filing and payment deadlines throughout the year, and missing them can result in penalties, interest, and increased HMRC scrutiny.
Understanding these obligations; and meeting them on time; is essential to maintaining a well-managed and compliant business.
While exact dates vary depending on a company’s accounting period and incorporation date, the following are the most important deadlines most companies need to monitor.
Corporation Tax Payment
Corporation Tax is generally due 9 months and 1 day after the end of your accounting period.
For example, a financial year end of 31 March 2026 would have a corporation tax payment deadline of 1 January 2027.
This is often one of the most significant cash outflows for a company and requires careful planning to ensure funds are available when due.
It is worth noting that larger companies with taxable profits exceeding £1.5m are required to make quarterly instalment payments.
Corporation Tax Return (CT600)
Your Corporation Tax return must be filed with HMRC 12 months after the end of the accounting period.
Using the same example as above, a financial year end of 31 March 2026 would have a CT600 filing deadline of 31 March 2027.
Although the filing deadline is later than the payment date, the calculation itself must be prepared in advance to determine the tax liability.
Statutory Accounts (Companies House)
Companies must file annual accounts with Companies House 9 months after the end of their financial year.
Therefore, a company with a year end of 31 March 2026 would need to submit its accounts at Companies House by 31 December 2026
For new companies, the first filing deadline may be longer, but thereafter the standard 9-month rule applies.
Dormant companies are also required to file accounts each year, with no exemption available.
Confirmation Statement
A Confirmation Statement must be filed at least once every 12 months, confirming that company details held at Companies House are up to date.
This is typically a straightforward filing but is often overlooked if not diarised properly.
PAYE and Payroll Obligations
If you operate a payroll, PAYE and National Insurance must usually be paid monthly, by the 22nd of the following month (if paying electronically), whilst Real Time Information (RTI) submissions must be made on or before each payment to employees
VAT Returns and Payments (if registered)
For VAT-registered businesses, VAT returns are typically filed quarterly with submission and payment due 1 month and 7 days after the end of the VAT period
The Consequences of Missing Deadlines
Failing to meet filing or payment obligations can result in a range of consequences, depending on the type and duration of the delay.
Financial Penalties
Late filing penalties apply automatically in many cases. For Companies House accounts, companies can be fined up to £150 for a short delay, Increasing to £1,500 or more for prolonged lateness.
It is also important to note that penalties are doubled if your company accounts are filed late in two consecutive years.
For Corporation Tax returns, there is an initial £200 fixed penalty for filing less than 3 months late, with an additional £200 penalty after 3 months. If filing 6 months or more late, HMRC will estimate your tax bill and add a further penalty of 10%. After 12 months, HMRC will then issue a penalty of a further 10%.
If your tax return is filed late 3 times in a row, HMRC will increase the £200 fixed penalties to £1,000.
Interest on Late Payments
If Corporation Tax, PAYE, or VAT is paid late, HMRC will charge interest from the due date until payment is made.
This is not a one-off charge; it accrues daily, increasing the longer the liability remains unpaid.
Increased HMRC Scrutiny
Repeated late filings or payments can raise concerns with HMRC and may lead to:
A poor compliance history can become a risk factor in itself.
Risk to Company Status
Failure to file accounts or confirmation statements can result in Companies House taking action to strike the company off the register. If a company is struck off:
Even where strike-off is reversed, the process can be costly and time-consuming.
Personal Implications for Directors
Directors are legally responsible for ensuring that the company meets its statutory obligations. Persistent non-compliance can lead to:
Staying Compliant
Meeting these obligations is largely a matter of good systems and forward planning. Well-run companies will typically:
Conclusion
UK companies operate within a structured compliance framework, with clearly defined filing and payment deadlines. While these obligations are manageable, missing them can have financial, operational, and reputational consequences.
A proactive approach; supported by accurate record-keeping and timely advice; ensures that deadlines are met, risks are minimised, and the business can focus on its core activities with confidence.
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