Companies House Accounts Filing Deadline 2026: What Every UK Business Needs to Know

For every UK limited company, filing annual accounts with Companies House is an important legal responsibility. Whether a business is actively trading, dormant or small, it generally needs to prepare and deliver accounts to Companies House.

For most private limited companies, the deadline for annual accounts is 9 months after the end of the company’s financial year. Public companies generally have 6 months. The deadline is calculated precisely, so businesses should not assume that filing at any point during the ninth month is sufficient.

With Companies House continuing to introduce changes to corporate reporting requirements, understanding the Companies House accounts filing deadline 2026 is particularly important for directors and business owners.

What Is the Companies House Accounts Filing Deadline?

The filing deadline is the final date by which acceptable annual accounts must be received by Companies House.

For a typical private limited company:

Accounts filing deadline = 9 months after the accounting reference date

The accounting reference date is generally the last day of the month in which the anniversary of incorporation falls, unless the company has changed its accounting reference date.

For example, if a company’s accounting reference date is 31 December 2026, its annual accounts would normally need to reach Companies House by:

30 September 2027

The deadline is about when Companies House receives acceptable accounts, not simply when the company sends them.

Companies House Filing Deadline 2026 at a Glance

Company situation	Normal filing deadline
Private limited company	9 months after financial year end
Public limited company	6 months after financial year end
First accounts for a private company covering more than 12 months	21 months from incorporation or 3 months from accounting reference date, whichever is longer
Dormant company	Same filing deadline as other companies
LLP	Generally 9 months after accounting reference period

The first accounts deadline can differ from the deadline for subsequent annual accounts.

Example: How to Calculate Your 2026 Filing Deadline

Suppose your private limited company’s financial year ends on:

31 March 2026

The normal Companies House filing deadline would be:

31 December 2026

This is because private companies generally have nine months from the end of their accounting reference period to deliver their accounts.

Another example:

Financial year end: 30 September 2026
Companies House deadline: 30 June 2027

The exact deadline depends on your company’s accounting reference date, so directors should check their company’s Companies House record rather than relying on a general calendar date.

What Are Accounting Reference Dates?

Your accounting reference date, or ARD, determines the end of your company’s financial year.

For a new company, the first accounting reference date is normally the last day of the month in which the anniversary of incorporation occurs. Subsequent accounting reference dates normally fall on the same date each year.

For example, if a company was incorporated on 15 May 2025, its first accounting reference date would normally be 31 May 2026.

The company would generally have until 28 February 2027 to file its first annual accounts, assuming the normal rules apply.

What Are the First Accounts Filing Rules?

Your company’s first accounts can have a different deadline from later accounts.

For a private company whose first accounts cover more than 12 months, Companies House states that the accounts must normally be delivered within:

• 21 months of incorporation, or
• 3 months from the accounting reference date,

whichever is longer.

This is why newly incorporated companies should not automatically assume that their first accounts are due nine months after their first financial year end.

Do Dormant Companies Need to File Accounts?

Yes.

A dormant company still has to deliver accounts to Companies House, even if it has not traded.

Companies House states that all companies must file annual accounts, including dormant companies and flat management companies. Dormant companies can potentially qualify for audit exemption, but their accounts still need to be filed by the relevant deadline.

The same late filing penalties can apply to dormant accounts.

Therefore, putting a company into dormant status does not remove its Companies House filing responsibilities.

What Accounts Does a Small Company Need to Prepare?

The accounts a company needs to prepare depend on its size, structure and applicable accounting requirements.

Depending on the circumstances, accounts may include items such as:

• Balance sheet
• Profit and loss account
• Notes to the accounts
• Directors’ report, where applicable
• Auditor’s report, where applicable
• Other required statements or information

Companies must make sure their accounts meet the applicable Companies Act requirements before submitting them.

Companies House guidance also makes clear that directors remain responsible for the company’s legal obligations even when an accountant prepares and files the accounts.

What Happens If You Miss the Companies House Deadline?

Late filing can result in an automatic financial penalty.

For private companies and LLPs, the current penalties are:

How late are the accounts?	Private company / LLP penalty
Not more than 1 month	£150
More than 1 month but not more than 3 months	£375
More than 3 months but not more than 6 months	£750
More than 6 months	£1,500

These penalties are based on how late the accounts are delivered.

The penalty can also be doubled where accounts are filed late in two successive financial years under the relevant rules.

Are Late Filing Penalties Automatic?

Yes.

Companies House states that a late filing penalty is automatically imposed when accounts are delivered after the deadline.

Directors are responsible for ensuring that acceptable accounts reach Companies House on time. It is not enough to assume that an accountant, employee or another director will take care of the deadline without checking the arrangements.

What If Companies House Rejects Your Accounts?

This is an important point for directors.

Submitting accounts before the deadline does not necessarily protect the company if the accounts are rejected and the corrected accounts arrive after the deadline.

Companies House states that accounts must meet the relevant legal requirements before they can be accepted. If accounts are rejected after the filing deadline and corrected accounts are filed late, a late filing penalty can apply.

This is why businesses should avoid leaving their filing until the final day.

Can You Get More Time to File?

In certain circumstances, a company can apply for an extension if an unforeseen event prevents it from filing on time.

The application must be made before the existing filing deadline.

Companies House gives examples such as unexpected illness or a fire destroying company records shortly before the filing deadline. An extension is not something companies should rely on as a routine way of delaying their accounts.

If the deadline has already passed, applying for an extension will generally be too late to prevent a late filing penalty.

Companies House Accounts vs Corporation Tax Return

One common mistake is assuming that filing accounts with Companies House is the same as filing a Corporation Tax Return with HMRC.

They are separate requirements.

A private limited company generally has:

Companies House accounts deadline: 9 months after the financial year end.

Corporation Tax payment deadline: normally 9 months and 1 day after the end of the Corporation Tax accounting period.

Company Tax Return deadline: normally 12 months after the end of the Corporation Tax accounting period.

This means a business can have several different deadlines to manage.

Companies House Accounts and Corporation Tax

Your annual accounts provide important financial information that can also help with Corporation Tax calculations.

However, Companies House filing and HMRC Corporation Tax reporting are separate obligations.

Businesses should therefore maintain accurate records throughout the year so that their Corporation Tax position can be calculated correctly.

Good bookkeeping can make the year-end process significantly easier.

How Bookkeeping Helps With Year-End Accounts

Accurate bookkeeping is one of the foundations of timely accounts preparation.

Throughout the year, businesses should maintain records of:

• Sales
• Purchases
• Expenses
• Bank transactions
• Payroll
• Debtors
• Creditors
• Fixed assets
• Loans
• Stock, where applicable
• VAT transactions

At year end, these records can be reconciled and reviewed before the accounts are prepared.

This can reduce the risk of discovering missing information shortly before the Companies House deadline.

What About VAT and MTD?

Businesses may have additional reporting obligations alongside Companies House accounts.

For example, a VAT-registered company needs to manage its VAT records and returns according to the applicable VAT rules.

Some businesses are also affected by MTD requirements. Making Tax Digital requirements depend on the relevant tax and business circumstances, so Companies House accounts should not be treated as a replacement for separate HMRC reporting obligations.

Keeping digital and well-organised accounting records can help businesses manage these different requirements more efficiently.

What Role Does Payroll Play?

Payroll information can be particularly important when preparing year-end accounts.

Businesses should reconcile:

• Employee wages
• Employer National Insurance
• PAYE liabilities
• Pension contributions
• Payroll-related balances

Accurate payroll records help ensure that liabilities shown in the accounts are supported by the underlying records.

Payroll should therefore be reviewed as part of the wider year-end accounting process.

Do Companies Need an Audit?

Not every UK company needs a statutory audit.

Some companies may qualify for an audit exemption, subject to the applicable rules and eligibility requirements.

However, companies that are required to have an audit need to include the relevant auditor’s report with their accounts. Companies House guidance confirms that an auditor’s report is required unless the company is exempt from audit.

Businesses should therefore establish their audit position before finalising their accounts.

Where an audit is legally required or otherwise appropriate, an Audit Service can form part of the year-end process.

Important Companies House Changes Coming in 2028

Although the focus is the Companies House accounts filing deadline 2026, businesses should also be aware of upcoming filing reforms.

The government announced in June 2026 that major Companies House accounts reforms will come into effect from April 2028, rather than April 2027.

The reforms include:

• Requiring small companies and micro-entities to file profit and loss accounts, with an option to opt out of publication in certain circumstances
• Requiring companies to file annual accounts using commercial software
• Removing abridged accounts
• Strengthening eligibility statements for companies claiming audit exemption
• Requiring component parts of accounts and reports to be filed together

Companies House has stated that the changes will give businesses more time to prepare for the new requirements.

How UK Businesses Can Prepare for Their 2026 Filing Deadline

A simple year-end process can help reduce last-minute problems.

1. Confirm Your Accounting Reference Date

Check your company’s Companies House record and identify the exact accounts filing deadline.

2. Keep Bookkeeping Up to Date

Make sure all bank transactions, sales, purchases and expenses have been recorded.

3. Reconcile Bank Accounts

Bank reconciliations can identify missing or duplicated transactions.

4. Review Debtors and Creditors

Check outstanding customer invoices and supplier balances.

5. Check Payroll Records

Make sure payroll liabilities and payments have been properly recorded.

6. Review VAT Records

Reconcile VAT balances and investigate any differences.

7. Review Fixed Assets

Check additions, disposals and depreciation information.

8. Prepare Year-End Accounts Early

Do not wait until the filing deadline is approaching before beginning the accounts process.

9. Check Whether an Audit Is Required

Establish whether the company qualifies for an audit exemption or requires an auditor.

10. File Before the Deadline

Allow time for reviewing and correcting any issues before the final filing date.

Companies House Filing Deadline Checklist

Before filing your 2026 accounts, check:

• Accounting reference date confirmed
• Filing deadline confirmed
• Bookkeeping completed
• Bank accounts reconciled
• Sales and expenses reviewed
• Debtors and creditors checked
• Payroll balances reconciled
• VAT records reviewed
• Fixed assets reviewed
• Corporation Tax calculations considered
• Audit requirement checked
• Accounts reviewed and approved
• Accounts filed before the deadline
• Confirmation of successful filing retained

Frequently Asked Questions

How long do private companies have to file accounts?

A private company normally has 9 months from the end of its accounting reference period to deliver its annual accounts to Companies House.

What is the penalty for filing Companies House accounts late?

For a private company, the penalty starts at £150 for accounts filed no more than one month late and can rise to £1,500 when accounts are more than six months late.

Do dormant companies need to file accounts?

Yes. Dormant companies generally still have to file annual accounts with Companies House and are subject to the relevant filing deadlines.

Are Companies House accounts and Corporation Tax returns the same?

No. Companies House accounts and the Company Tax Return sent to HMRC are separate filing requirements and have different deadlines.

Can I change my company’s accounting reference date?

Yes, subject to the applicable rules. Companies can change their accounting reference date, but the change must be made before the relevant filing deadline.

Can I get an extension to my filing deadline?

An extension can be requested in certain exceptional circumstances, but the application must be made before the existing filing deadline.

Conclusion

The Companies House accounts filing deadline 2026 is an important date for every UK limited company. For most private companies, annual accounts must reach Companies House within nine months of the financial year end.

Directors should remember that Companies House accounts are only one part of their wider compliance responsibilities. Corporation Tax, VAT, MTD, Payroll, bookkeeping and other reporting obligations may have separate requirements and deadlines.

Starting the year-end process early gives businesses more time to reconcile their records, prepare accurate accounts, resolve errors and deal with any audit requirements.

For professional support with bookkeeping, accounting and year-end compliance, Coxhinkins can help businesses manage their VAT, MTD, Payroll, Corporation Tax, Year End Accounts, and Audit Service requirements while keeping their financial records organised and ready for filing.