Filing annual accounts with Companies House: deadlines, fees and penalties for 2026

Why annual accounts matter beyond compliance

Annual accounts are the formal record of a company's financial performance — assets, liabilities, revenues, and profit or loss over the financial year. Once filed with Companies House, they become part of the public register, visible to anyone from suppliers and lenders to competitors and potential investors.

That transparency is intentional. The UK's open register is designed to support trust in commercial relationships. A company that files on time, year after year, with consistent and clearly prepared accounts communicates something quite different from one that files late, with minimal disclosure, at irregular intervals. The filing record is itself a signal.

For expats setting up UK companies, directors appointed to existing boards, or business owners navigating the filing requirements for the first time, understanding both the mechanics and the significance of the annual accounts obligation is an important part of running a compliant company.

Who must file

Every company incorporated under UK law must file annual accounts with Companies House, regardless of whether it has traded during the year. This obligation applies to private limited companies, public limited companies, limited liability partnerships, and certain overseas companies with a UK establishment.

Dormant companies — those with no significant accounting transactions — must still submit accounts. Dormant accounts are simpler than trading accounts, typically consisting of a balance sheet and a small number of notes. The obligation does not disappear because no business took place. A company that has ceased trading but not been formally dissolved must continue to file until it is struck off the register.

The responsibility for ensuring timely, accurate filing rests with the company's directors. Delegating to an accountant or company secretary is common and sensible, but it does not transfer the legal duty. If accounts are late, the penalty attaches to the company — and the directors are responsible for the company.

Filing deadlines

The deadline is calculated from the end of the financial year, known as the accounting reference date (ARD). For a private limited company, accounts must be filed within nine months of the ARD. For a public limited company, the deadline is six months. The shorter deadline for PLCs reflects the greater public interest in timely disclosure for companies that can raise capital from the public.

First-year accounts operate under different rules. A newly incorporated company has 21 months from its incorporation date, or three months from its first ARD, whichever is longer. This extended window acknowledges the time needed to establish accounting systems during a company's first year.

Missing the deadline by even a single day triggers an automatic penalty. There is no grace period and no mechanism to appeal on grounds of administrative difficulty. The only way to avoid a penalty is to file on time.

2026 fee changes

From 1 February 2026, Companies House increased several of its standard filing fees as part of the funding programme for the Economic Crime and Corporate Transparency Act reforms. The changes affect new incorporations, annual confirmation statements, and voluntary strike-offs.

Annual accounts themselves do not carry a Companies House filing fee — the costs are in the confirmation statement and incorporation stages. The fee increases fund enhanced enforcement powers, identity verification infrastructure, and the active register checks introduced under the ECCTA.

HMRC joint filing service closes 31 March 2026

The free HMRC joint filing service — sometimes called CATO — has allowed companies to file their annual accounts and corporation tax return (CT600) in a single submission since 2011. This service closes permanently on 31 March 2026.

From 1 April 2026, the two filings must be made separately. Annual accounts continue to be filed with Companies House through the usual routes — WebFiling or compatible software. Corporation tax returns and the accounts sent to HMRC must now be filed using commercial software; the free HMRC web form for corporation tax is being withdrawn at the same time.

If your company currently uses the joint service, the most important steps are: arrange commercial accounting software before 31 March 2026, and download at least three years of previously filed returns and accounts from the joint service before it closes — historical filings will not be accessible after closure. Acting before the deadline avoids both the compliance gap and the rush of other companies making the same transition simultaneously.

What annual accounts must include

The required contents of annual accounts vary by company size, but all sets follow a consistent structure. At the core is the balance sheet — a snapshot of assets, liabilities, and equity at the year-end date. Alongside it, most companies must also file a profit and loss account showing revenues, costs, and the resulting profit or loss.

Notes to the accounts provide the context that turns figures into a comprehensible picture. They explain accounting policies, unusual transactions, related-party dealings, and contingent liabilities. A directors' report covering the principal activities and business review is required for most companies above the micro-entity threshold. Larger companies or those not exempt from audit must also include an auditor's report.

Small companies and micro-entities currently benefit from reduced disclosure requirements. Small companies can file abridged accounts omitting the profit and loss account and directors' report from the public record. Micro-entities have further simplifications available. These options remain in place following the January 2026 decision to pause the proposed April 2027 reforms.

Filing methods

There are three routes to file accounts with Companies House: online through the WebFiling service, through compatible accounting software, or by post. Digital filing is faster, provides immediate confirmation of receipt, and — as the fee table above shows — is significantly cheaper than paper.

WebFiling is suitable for most private companies with straightforward accounts. The service runs validation checks before submission, but these are structural rather than substantive — it will flag a balance sheet that does not balance, but it will not identify a misclassified expense. The accuracy of the content remains the director's responsibility.

Accounting software integration is increasingly the standard approach for companies using platforms such as Sage, QuickBooks, or Xero. These tools allow accounts to be prepared within the same system used for day-to-day bookkeeping and submitted directly to Companies House and, until 31 March 2026, to HMRC through the joint service. From April 2026, each submission is made separately, but the workflow within integrated software remains streamlined.

Postal filing is still accepted for certain account types that the online system cannot handle, but it carries processing delays and no immediate confirmation. For most companies, it is the least efficient option and now carries significantly higher fees.

Identity verification and confirmation statements

From 18 November 2025, the annual confirmation statement — the filing in which a company confirms the accuracy of its register information — cannot be submitted unless all directors have completed identity verification and their personal codes are included. This requirement is separate from the accounts filing itself but applies at the same time for companies whose accounts and confirmation statements fall in the same window.

One unverified director is enough to block the confirmation statement entirely. For companies approaching their confirmation statement deadline, ensuring all directors have verified their identity in advance is now a prerequisite for compliance. The identity verification guide covers this in full.

Late filing penalties

Companies House operates an automatic penalty system for late accounts. Penalties escalate with the length of the delay and are significantly higher for public limited companies. There is no mechanism to request a grace period, and the penalties apply per set of accounts regardless of the reason for lateness.

All penalties double if the company filed late in the previous year. A private company that is more than six months late two years in a row faces a £3,000 penalty rather than £1,500. Persistent non-compliance can also draw regulatory attention, harm credit ratings, and affect banking relationships in ways that go beyond the financial penalty itself.

Why accounts get rejected

Companies House does not audit the financial content of accounts, but it does run checks before accepting a submission. Common reasons for rejection include a missing or expired authentication code, an unsigned balance sheet, an incorrect company registration number, and file format issues in software submissions.

A rejection close to the deadline is a high-risk situation. If the corrected accounts are not resubmitted before the deadline, a penalty applies regardless of the rejection. Filing well before the deadline — ideally several weeks in advance — allows time to correct and resubmit if the initial attempt is refused.

The paused April 2027 reforms: what you need to know

In July 2025, Companies House confirmed that from April 2027, all companies would be required to file accounts using commercial software only, and small companies and micro-entities would have to file full profit and loss accounts publicly — ending the option for abridged or filleted accounts. These proposals attracted significant opposition from small business groups and professional bodies.

In January 2026, the government confirmed that both reforms have been paused and are under review. The official guidance now states that changes to accounts filing will not be introduced in April 2027. A final decision will be announced, and companies will receive at least 21 months' notice before any changes come into force.

The practical implication is clear: no immediate action is required on accounts filing format. The existing WebFiling service remains available. Abridged accounts remain permissible. Companies that were considering purchasing new software specifically for the 2027 requirements can pause that decision. If the reforms are eventually reintroduced in some form, the notice period ensures time to prepare.

What has not changed: the HMRC joint filing service still closes on 31 March 2026. That is a confirmed deadline and requires action now if it affects your current workflow.

Getting professional help

Many directors choose to have accounts prepared and filed by a professional accountant. For companies with external investors, lenders, or complex structures, professionally prepared accounts carry additional credibility and are less likely to contain the kinds of technical errors that trigger rejection or queries.

If you use an external agent, confirm before 31 March 2026 that they are equipped to file separately after the joint HMRC service closes. Also confirm whether they are registered as an Authorised Corporate Service Provider — from late 2026, only ACSP-registered agents will be able to submit documents to Companies House on behalf of clients.

Frequently asked questions

In summary

Filing annual accounts is a legal obligation that carries no flexibility on deadlines and no tolerance for avoidable errors. The 2026 landscape has shifted in several ways that affect the filing process directly: fees have risen, identity verification is now a prerequisite for confirmation statements, and the HMRC joint filing service closes at the end of March. Each of these requires attention before it becomes a problem.

The April 2027 accounts reforms — mandatory software filing and the end of abridged accounts for small companies — have been paused, which removes an imminent source of disruption. But the pause is not a permanent reprieve. The direction of travel is towards greater transparency, verified identities, and software-based filing. Companies that plan accordingly, maintain good accounting records, and file consistently and on time will find the transition manageable when it eventually arrives.

For directors new to the UK system — whether recently appointed, recently incorporated, or recently arrived from overseas — the fundamentals remain straightforward: know your ARD, know your deadline, verify your identity before the confirmation statement is due, and have a plan in place for filing accounts and corporation tax separately from April 2026 onwards.