Every limited company in the UK must file annual accounts with Companies House and submit a Corporation Tax Return to HMRC.

Missing deadlines can lead to automatic penalties and unwanted stress.

This guide explains what you need to know.

1. Companies House Filing Deadline

Most companies must file accounts within 9 months after the end of their financial year.

Example:
If your year-end is 31 March, your accounts must be filed by 31 December.

2. Corporation Tax Deadline

You must:

File the Corporation Tax Return

Within 12 months after the accounting period ends.

Pay Corporation Tax

Usually within 9 months and 1 day after the accounting period ends.

3. What Happens if You Miss the Deadline?

Companies House penalties can include:

£150 (up to 1 month late)

£375 (1–3 months late)

£750 (3–6 months late)

£1,500 (more than 6 months late)

If late filing happens repeatedly, penalties double.

4. What You Need for Year-End Accounts

To prepare your accounts, you should have:

Sales invoices

Purchase invoices

Bank statements

Payroll records

VAT returns

Expense receipts

Good bookkeeping makes this much easier.

5. How RedTax Accounts Ltd. Can Help

We support businesses with:

Year-end accounts preparation

Companies House submission

Corporation Tax calculation & filing

Bookkeeping cleanup before year-end

Tax-saving advice

Conclusion

Company accounts deadlines are strict — but with the right planning, they don’t have to be stressful.

If you want your accounts filed correctly and on time, contact RedTax Accounts Ltd.