Filing Statutory Accounts at Companies House

1. What Gets Filed

A set of statutory accounts for a small UK limited company comprises a balance sheet (statement of financial position), an optional profit and loss account (not required for micro-entities filing with Companies House), notes to the accounts, and a director's signature.

Medium-sized and large companies must also include a strategic report, director's report, and audited financial statements, but the thresholds are high: a company qualifies as small if it meets two of (a) turnover <= £15m, (b) balance sheet total <= £7.5m, (c) average employees <= 50. The vast majority of owner-managed SMEs sit comfortably inside the small-company regime.

2. Deadlines and First-Year Rules

For a private limited company, annual accounts must reach Companies House within 9 months of the accounting reference date (ARD). The first set of accounts after incorporation has a special extended deadline: 21 months from the incorporation date, reflecting that a first accounting period may be longer than 12 months.

The ARD defaults to the last day of the month of incorporation and can be changed through form AA01, though repeated extensions are restricted. Changing the ARD to shorten a period is generally allowed freely; changing it to extend a period is limited to once every five years and cannot extend an individual accounting period beyond 18 months.

3. Filing Formats and iXBRL

Companies House accepts three filing channels: WebFiling (the official HMRC/Companies House portal), third-party accounting software with Companies House integration (Xero, FreeAgent, Sage, IRIS, etc.), and paper submission. Paper is slowest, error-prone, and being progressively phased out under the Economic Crime Act.

HMRC requires the CT600 and its accompanying accounts to be submitted in iXBRL (Inline eXtensible Business Reporting Language) format, a machine-readable layer that tags each figure with its accounting meaning. Modern bookkeeping software handles this invisibly; manual iXBRL tagging for directors filing their own returns is tedious and prone to rejection.

4. Director Responsibilities

Under the Companies Act 2006, directors are personally responsible for ensuring accounts give a "true and fair view" of the company's financial position. Delegating preparation to an accountant does not transfer this duty, directors approve the accounts, and directors remain accountable for errors, omissions, or misstatements.

In practice this means reviewing the draft accounts before signing: checking that director remuneration ties to the payroll records, that the director's loan account balance matches your own records, that dividends declared in the year are legal against distributable reserves, and that related-party transactions are properly disclosed. Rubber-stamping a draft without review is a governance failure that can become personal liability if the company later enters insolvency.

5. Economic Crime Act Changes

The Economic Crime and Corporate Transparency Act 2023 has been phased in across 2024-2026, reshaping Companies House from a passive registry to an active regulator. Key changes directors must accommodate in 2026 filings:

• Identity verification: all directors, PSCs, and persons filing on a company's behalf must verify their identity through GOV.UK One Login or via an Authorised Corporate Service Provider (ACSP).
• End of abridged accounts: small companies will lose the option to file abridged accounts (balance sheet without the P&L). All small companies will file full accounts, with a profit and loss option for micro-entities.
• Software-only filing: paper and WebFiling routes are being withdrawn in favour of API-based software filing. Directors using Xero, FreeAgent, or Sage are largely unaffected; directors filing manually will need to adopt software.
• Registered office requirements: PO boxes are banned. A registered office must be an address where documents can be physically delivered and acknowledged.

6. Late Filing Penalties

Companies House penalties are automatic, unavoidable, and apply even if the company has no trading activity. The amounts depend on how late the filing is and whether the company was also late in the previous year:

• Up to 1 month late: £150.
• 1 to 3 months late: £375.
• 3 to 6 months late: £750.
• More than 6 months late: £1,500.
• Repeat offender (late two years running): all penalties are doubled.

Penalties from HMRC for the CT600 are separate: £100 automatic for being one day late, rising to £200 after three months, then 10-20% of the unpaid tax after 18-24 months. A company that files both late is exposed to fines from both regulators simultaneously.

7. Amending a Filed Set of Accounts

If a mistake is discovered after filing, revised accounts can be submitted using form AA10 (amended accounts) or through software if it supports amendments. The revised set must be clearly marked "Amended" and must be accompanied by a statement explaining which figures have changed.

Amendments do not remove the original from the public record, both versions remain visible on Companies House search. For a small error, the reputational cost of an amendment can exceed the cost of the error itself. The strong recommendation is to review drafts thoroughly before the first submission; amendments should be a last resort, not a planning tool.

For full statutory preparation and filing support, see our year-end accounts service.