Registering your limited company in the UK is just the beginning. Once your company is on the Companies House register, a set of annual compliance obligations kicks in immediately, and they run every year for as long as your company exists. Missing them is not just a financial risk. It can damage your company’s reputation, affect your ability to raise investment, and, in serious cases, result in your company being struck off the register entirely.
Annual filing in the UK covers everything your limited company must submit to both Companies House and HMRC each year, from your financial accounts and confirmation statement to your corporation tax return and VAT filings.
This guide walks startup founders through every requirement, every deadline, and every penalty in plain language so you can stay compliant and focus on building your business.
What is Annual Filing in the UK?
Annual filing in the UK refers to the yearly submission of statutory documents, including confirmation statements, annual accounts, and tax returns, to Companies House and HM Revenue and Customs to keep a company legally compliant.
All UK limited companies must submit annual filings to Companies House and HMRC to stay registered. The directors of a company are legally responsible for completing the annual filing requirements. Failure to complete the annual filing requirements can result in penalties, including fines.
These obligations fall under two separate authorities: Companies House, which manages your company’s public record and financial transparency, and HMRC, which oversees your tax affairs. Satisfying one does not satisfy the other. Both must be addressed, with different forms, different deadlines, and different penalty systems.
Who Needs to File Annual Returns in the UK?
Every UK-registered limited company must complete annual filing obligations without exception. This includes companies that made a profit, companies that made a loss, companies with no income at all, and companies that never traded.
Compliance with the UK business annual filing needs is one of the important aspects of corporate governance for resident as well as non-resident directors. Failure to meet obligations with Companies House and HMRC can result in penalties, fines, or even a company strike-off.
Foreign founders with UK subsidiaries or branches face identical UK company filing requirements to domestic companies. Being based overseas provides no exemption from UK company compliance filing steps. If your company is on the Companies House register, it must file.
Annual Filing Requirements with Companies House
1. Confirmation Statement (CS01) Requirements
The confirmation statement submitted using form CS01 is your company’s annual check-in with Companies House. It confirms that the publicly registered details about your company are accurate and up-to-date, including directors, shareholders, registered office address, and people with significant control (PSC).
Your first confirmation statement is required to be filed within 14 days of the company’s first statement date. The statement date is the incorporation date minus one day. After your first filing, the 12-month review period begins again immediately, and you must file within 14 days of each subsequent statement date.
The online filing fee is £34. There is no direct financial penalty for late filing, but Companies House may strike off your company if you fail to submit it. For a document that takes minutes to complete, the consequences of ignoring it are entirely disproportionate.
2. Annual Accounts Filing Requirements
Every limited company must prepare and file a full set of annual accounts covering its financial year. These accounts go to Companies House as part of your UK company annual filing process and to HMRC as part of your corporation tax return.
Your annual accounts should involve a balance sheet, profit and loss statement, and notes to the accounts. Larger companies must also include a directors’ report and, where applicable, an independent audit report.
If you start your business, your first limited company accounts will cover a period of more than twelve months. For example, if your business is established on 10th June 2024, your first accounting period will end on 30th June 2025. So your first set of accounts will cover 12 months and 20 days. Within twenty-one months of the date your company was incorporated, you need to file your first accounts.
All subsequent accounts must be filed within nine months of your accounting reference date. Filing electronically through Companies House WebFiling is strongly recommended — paper filing is being phased out, and electronic submission significantly reduces the risk of rejection.
How to File Annual Filing in the UK — Step-by-Step Guide
Understanding the steps to file annual returns UK helps you approach the process systematically rather than reactively. Here is how these steps form the standard annual filing process for UK companies in 2026:
Step 1: Set your accounting reference date
Companies House automatically sets your accounting year-end as the last day of the month you incorporated. You are free to change it, but just be aware that doing so will push all your future filing deadlines along with it.
Step 2: Prepare your annual accounts
Once your financial year ends, prepare your statutory accounts: a balance sheet, profit and loss statement, and notes. For most small companies, this can be done using accounting software or with the help of an accountant.
Step 3: File your confirmation statement
Sign in to Companies House WebFiling, look over your company’s registered details, update anything that needs changing, and submit. The £34 filing fee can be paid online.
Step 4: Submit annual accounts to Companies House
Upload your accounts through WebFiling within the relevant deadline—21 months for the first accounts and nine months for subsequent accounts.
Step 5: Prepare your tax computations
Adjust your accounting profit for non-deductible expenses, capital allowances, and any reliefs you are claiming to work out your taxable profit figure.
Step 6: File your CT600 with the HMRC
Submit your corporation tax return, statutory accounts, and tax computations to HMRC in iXBRL format using commercial software. Pay your corporation tax bill by the nine-month and one-day deadline.
Step 7: File VAT and payroll returns, if applicable
If your company is VAT-registered or employs staff, submit your quarterly VAT returns and monthly payroll filings on their respective deadlines throughout the year.
Annual Filing Obligations with HM Revenue and Customs
Corporation Tax Return (CT600) Explained
The CT600 is your company’s annual corporation tax return submitted to HMRC. A company is required to register for corporation tax within 3 months of starting to trade. Corporation tax must be paid 9 months and 1 day after the end of the accounting period, and the CT600 must be filed within 12 months.
The payment deadline comes before the filing deadline, meaning you must calculate and pay your tax bill before submitting the return. This is one of the most common misunderstandings among first-year founders.
Corporation tax returns must be filed electronically through commercial accounting software. HMRC’s online filing option is being withdrawn, and from April 2026, the free CATO filing tool will close permanently. All companies must use approved software to file the CT600.
VAT Return Filing Requirements
Any VAT-registered company, including those earning more than £90,000 taxable turnover in a 12-month period, must register with HMRC and submit returns. VAT returns are usually due 1 month and 7 days after the end of the VAT period, which typically covers 3 months.
All VAT records must be maintained digitally under Making Tax Digital rules and submitted using compatible software. Using incompatible software or manual records is non-compliance and can lead to penalties.
PAYE and Payroll Reporting Obligations
If your company employs staff, payroll reporting is part of your annual compliance UK responsibilities. PAYE payments to HMRC are usually due monthly, although some businesses may qualify for quarterly payments. Late submissions can lead to penalties.
At the end of the tax year on 5 April, employers must issue P60 certificates to employees by 31 May and submit a final payroll report to HMRC confirming the year’s figures.
Annual Filing Deadlines for UK Companies — 2026 Calendar
| 12 months after the accounting period end | Submitted To | Deadline |
|---|---|---|
| Confirmation Statement | Companies House | Within 14 days of the statement date |
| First Annual Accounts | Companies House | Within 21 months of incorporation |
| Subsequent Annual Accounts | Companies House | Within 9 months of accounting year-end |
| Corporation Tax Payment | HM Revenue and Customs | 9 months and 1 day after accounting period end |
| CT600 Corporation Tax Return | HM Revenue and Customs | 12 months after accounting period end |
| VAT Return (if registered) | HM Revenue and Customs | 1 month and 7 days after each quarter |
| Final Payroll Submission | HM Revenue and Customs | By 5 April each year |
| P60 Issued to Employees | Employees | By 31 May each year |
For most companies, accounts must be filed 9 months after the end of the financial year. For example, if your financial year ends 31 March 2026, your filing deadline would typically be 31 December 2026.
Annual Filing for Special Cases
Dormant Companies Filing Requirements
Running a dormant company does not eliminate your business filing obligations UK. Dormant companies are still required to file their annual accounts and confirmation statement. However, dormant accounts are significantly simpler, typically just a basic balance sheet and notes, and cost considerably less to prepare than full trading accounts.
If you do not tell HMRC you are dormant for their purposes, they will still expect you to deliver your corporation tax return. Failure to do so will result in the same penalties as an active company. Formally notifying HMRC of dormancy is a simple step that eliminates the CT600 obligation for that period, but it must be done proactively, not assumed.
Foreign Companies with UK Presence
Foreign companies operating in the UK through a branch or subsidiary face the same annual UK compliance obligations as domestically owned companies. Compliance with UK company annual filing requirements is a critical aspect of corporate governance for both resident and non-resident directors.
If your overseas company has a UK-registered subsidiary, that subsidiary must file its own confirmation statement, annual accounts, and CT600 independently — exactly as any other UK limited company would. Non-resident directors are personally liable for missed filings, regardless of where they are based.
From 6 April 2020, non-UK resident companies receiving income from UK property must pay Corporation Tax on those profits and submit a CT600 accordingly. Double taxation treaty relief may be available based on your home country’s treaty position with the UK.
Late Filing Penalties and Consequences in the UK
Missing any annual filing deadline triggers automatic penalties. There are no warnings, no grace periods, and no exemptions for first-time founders.
Companies House — Late Annual Accounts Penalties:
| How late | Penalty |
|---|---|
| Up to 1 month | £150 |
| 1 to 3 months | £375 |
| 3 to 6 months | £750 |
| More than 6 months | £1,500 |
If you miss the deadline for filing your annual accounts, the penalty ranges from £150 to £1,500, depending on how late you are. Critically, these penalties double automatically if accounts are filed late two years in a row – meaning a second consecutive late filing at six months would cost £3,000 rather than £1,500.
HMRC — Late CT600 Penalties:
If your business tax return is delayed, the first penalty is £100. After three months, another £100 is added. Delays can even attract much larger amounts as penalties and interest on any unpaid taxes. If your tax return is delayed for the third time consecutively, the £100 penalty is increased to £500.
HMRC charges interest on overdue corporation tax. The current late payment interest rate from 6 April 2025 is 8.5%.
Beyond financial penalties, failure to meet UK company filing deadlines in 2026 can result in penalties ranging from £100 to £1,500+, director fines of up to £5,000, and strike-off under the Companies Act 2006.
Common Annual Filing Mistakes to Avoid
Even well-organised startup founders make these errors in their first year:
- Treating Companies House and HMRC as the same filing — they are separate bodies with different forms, different deadlines, and different penalty systems. Filing with one does not satisfy the other.
- Paying corporation tax after filing the CT600 — the payment deadline falls nine months and one day after your period ends, well before the 12-month filing deadline. Many founders reverse these and pay interest as a result.
- Assuming Dormant No Filings – Even dormant companies have to file a confirmation statement and dormant accounts with Companies House every year.
- Missing the 21-month first accounts deadline — first-year accounts come with a longer window than subsequent years, but many founders do not realise this is a one-time extension and fail to plan around it.
- Not registering for corporation tax within three months of trading — this is a legal requirement that kicks in the moment your company begins any business activity, not at year-end.
- Filing paper accounts instead of electronic — paper filing is being phased out. Electronic submission reduces rejection risk and is now the expected standard.
Annual Filing Checklist for UK Companies
Use this checklist every year to ensure nothing is missed:
| Task | Authority | Status |
|---|---|---|
| Confirm company details are accurate | Companies House | Pending |
| File confirmation statement (CS01) | Companies House | Pending |
| Prepare statutory annual accounts | Internal | Pending |
| File annual accounts | Companies House | Pending |
| Register for Corporation Tax (if new) | HMRC | Pending |
| Prepare tax computations in iXBRL | Internal | Pending |
| Pay the corporation tax bill | HMRC | Pending |
| File CT600 Corporation Tax Return | HMRC | Pending |
| Submit quarterly VAT returns (if registered) | HMRC | Pending |
| Run monthly payroll and PAYE filings (if applicable) | HMRC | Pending |
| Issue P60s to all employees | Employees | Pending |
| Submit final payroll submission | HMRC | Pending |
| Update PSC register if ownership changed | Companies House | Pending |
Conclusion
Annual filing in the UK is one of the most important ongoing responsibilities that comes with running a limited company. The rules are clear, the deadlines are fixed, and the consequences of getting it wrong financially and reputationally are real. For startup founders who want to earn the trust of investors, lenders, and future partners, keeping a clean and consistent filing record is one of the best things your company can do right from the start.
Managing annual filing in the UK can quickly become complex, especially as your business grows. OnDemand International helps companies manage their full compliance process from Companies House filings to HMRC submissions correctly and on time. Reach out to our experts today for smooth, stress-free UK company compliance filing.
FAQ’s
What is annual filing in the UK?
Annual filing in the UK is the process of submitting required documents, such as confirmation statements, annual accounts, and tax returns, to Companies House and HM Revenue and Customs to keep your company on the right side of the law.
Is annual filing mandatory for all UK companies?
Yes, all UK-registered limited companies must complete annual filing obligations, including dormant and non-trading companies. Failure to comply can lead to penalties or the company being struck off.
Can I file annual returns myself in the UK?
Yes, you can file directly through online portals provided by Companies House and HM Revenue and Customs. However, many businesses choose professional services to avoid errors.