Companies House Filing Guide 2026

Companies House is one of those obligations that most directors know exists, right up until it triggers an automatic penalty notice. Every limited company registered in England, Wales, Scotland, or Northern Ireland must file certain documents on time, every time. There are no reminders, no grace periods, and no appeals process for the standard late filing penalties. The fines are automatic.

I've spent 24 years in institutional finance at Citigroup and ABN AMRO, and now work with UK owner-managed businesses as a CGMA-qualified fractional finance director. The number of companies that arrive at my door having already been stung by avoidable Companies House penalties is, to put it diplomatically, far too high. According to Companies House official statistics, over 300,000 late filing penalties are issued each year. This guide covers every filing obligation, every deadline, every penalty, and every threshold change you need to know for 2026.

1. Companies House: What It Is and Why It Matters

Companies House is the United Kingdom's registrar of companies. It is an executive agency of the Department for Business and Trade, and it holds the public register of more than 5 million active companies. Every limited company, whether private (Ltd) or public (plc), must file certain documents with Companies House to remain in good standing.

The register is public. Anyone (potential customers, suppliers, lenders, competitors) can look up your company and see whether you've filed your accounts on time, who your directors are, who controls the company, and whether any red flags exist. A company that files late, or files incomplete information, signals to the market that its house is not in order. Banks and credit agencies routinely check Companies House records when making lending decisions.

Crucially, Companies House filings are separate from HMRC filings. Filing your corporation tax return with HMRC does not satisfy your Companies House obligations. They are different organisations, with different deadlines, and different penalties. Many directors conflate the two and end up paying fines to both.

2. Annual Confirmation Statement (CS01)

The confirmation statement replaced the old annual return in June 2016. Every company must file one at least once every 12 months. It confirms that the information Companies House holds about your company is accurate and up to date.

What the Confirmation Statement Confirms

• Registered office address: where official correspondence is sent
• Directors and secretaries: names, service addresses, dates of birth
• Shareholders and share capital: who holds what, and how many shares are in issue
• Standard Industrial Classification (SIC) codes: the nature of your business
• Persons of Significant Control (PSC): individuals or entities with significant control over the company
• Trading status of shares: whether shares are admitted to trading on a regulated market

When It's Due

Your confirmation statement must be filed within 14 days of the review date. The review date is either the anniversary of incorporation or the anniversary of the last confirmation statement, whichever is more recent. If your company was incorporated on 15 March, your review date is 15 March each year, and the statement must be filed by 29 March.

Fees

The fee is payable each time you file, regardless of whether any information has changed. Even if nothing has changed since last year, you must still file and pay.

3. Filing Annual Accounts

Every limited company must prepare and file annual accounts with Companies House. The deadline depends on whether the company is private or public, and whether it is filing its first set of accounts.

Filing Deadlines

For a private company with a 31 December 2025 year-end, annual accounts must be filed at Companies House by 30 September 2026. For a public company with the same year-end, the deadline is 30 June 2026.

New companies filing their first accounts have additional time: 21 months from the date of incorporation or 3 months from the accounting reference date, whichever is longer. However, this extended deadline only applies to the first filing. From the second year onward, the standard 9-month (or 6-month) deadline applies.

What Must Be Filed

What you must include depends on your company's size classification. All companies must file at minimum a balance sheet signed by a director and any notes to the accounts. The level of detail required increases with company size. Micro-entities have the lightest obligations, while large companies must file full statutory accounts including a directors' report and (in some cases) an auditor's report.

4. 2024/2025 Company Size Threshold Changes

This is the most significant change affecting UK company filings in recent years. For accounting periods starting on or after 1 October 2024, the thresholds that determine whether a company qualifies as micro, small, medium, or large have been substantially increased. These changes were introduced by The Companies (Accounts) (Amendment) Regulations 2024 (SI 2024/686) and align with similar EU directive changes.

A company must meet at least two of the three criteria (turnover, balance sheet, employees) for two consecutive financial years to qualify for a given size category. A company that breaches two of the three thresholds in a single year does not immediately lose its classification. It must breach them for two years running.

Previous vs. New Thresholds Comparison

The micro and small thresholds saw significant increases in the 2024 regulations, bringing many more companies within the scope of reduced filing requirements. If your company has a turnover of, say, £8 million and a balance sheet total of £4 million, you now qualify as a small company, entitling you to file abbreviated disclosures and potentially claim audit exemption.

5. What Small Companies Must File

Small companies benefit from significantly reduced filing requirements at Companies House. Understanding exactly what you must file, and what you can omit, can save your business from unnecessary public disclosure.

Abbreviated Accounts (No Longer Available)

Prior to 2016, small companies could file abbreviated accounts, a condensed balance sheet with limited notes. This option was abolished for accounting periods starting on or after 1 January 2016. If you see references to "abbreviated accounts" online, they relate to the old regime.

Filleted Accounts

What replaced abbreviated accounts is the concept of filleted accounts. A small company prepares full statutory accounts for its shareholders (members), but when filing at Companies House, it can choose to remove:

• The profit and loss account (income statement)
• The directors' report

This means the public register shows only your balance sheet and notes — your turnover, profit margins, and directors' commentary remain private. For competitive businesses that don't want suppliers or competitors knowing their margins, this is significant.

Micro-Entity Exemptions

Micro-entities have even lighter obligations. A qualifying micro-entity can file:

• A simplified balance sheet only
• Limited notes (only guarantees, financial commitments, and advances/credits to directors)
• No profit and loss account required at Companies House
• No directors' report required at Companies House
• No audit requirement (subject to group size)

6. Late Filing Penalties

Companies House late filing penalties are automatic. There is no warning, no grace period, and no discretion. If your accounts arrive even one day late, the penalty is imposed immediately. The penalty is levied on the company (not the directors personally), but the directors are responsible for ensuring the filing happens on time.

Private Company Penalties

Public Company Penalties

Can You Appeal a Late Filing Penalty?

Technically, yes, but the bar is extremely high. Companies House will not accept the following as grounds for appeal:

• The accounts were delayed by the company's accountant or auditor
• The director was unaware of the filing deadline
• The company had no transactions during the period
• The accounts were filed on time at HMRC
• The company is dormant (dormant companies must still file)

The only grounds that have been accepted in practice involve genuine disruption: natural disasters, serious illness affecting the sole director, or Companies House system failures that can be evidenced with timestamps.

7. Director Responsibilities and Personal Liability

Under the Companies Act 2006, directors are personally responsible for ensuring that accounts are filed on time. This is not a matter of corporate liability alone. It extends to individual directors.

If a company persistently fails to file documents at Companies House, the Registrar can refer the matter to the court. Directors may face:

• Criminal prosecution: failure to file accounts is a criminal offence under section 451 of the Companies Act 2006. Directors can be fined in the magistrates' court.
• Director disqualification: the Insolvency Service can apply for a disqualification order, preventing the individual from acting as a director for up to 15 years.
• Striking off: Companies House can strike the company off the register, at which point all assets (including bank balances) vest in the Crown.

Even if you delegate the preparation of accounts to an accountant, the legal responsibility for filing remains with the directors. You cannot outsource the duty itself, only the work. If your accountant is slow and the filing is late, the penalty falls on the company and the reputational damage falls on you.

8. PSC Register Requirements

Since April 2016, every UK company must maintain a register of Persons of Significant Control (PSCs) and file this information with Companies House. The PSC register is designed to increase transparency about who ultimately owns and controls UK companies.

Who Qualifies as a PSC?

An individual is a PSC if they meet one or more of the following conditions:

• Holds, directly or indirectly, more than 25% of the company's shares
• Holds, directly or indirectly, more than 25% of the company's voting rights
• Has the right to appoint or remove a majority of the board of directors
• Has the right to exercise, or actually exercises, significant influence or control over the company
• Has the right to exercise, or actually exercises, significant influence or control over a trust or firm that itself satisfies any of the above conditions

What Must Be Registered

For each PSC, the company must record and file:

• Full name, date of birth, nationality, and country of residence
• Service address and usual residential address (the residential address is not published on the public register)
• The date on which the individual became a PSC
• Which of the five conditions they satisfy
• The nature and extent of their control (reported in prescribed percentage bands: over 25% up to 50%, 50% to 75%, or 75% and above)

Penalties for Non-Compliance

Failure to maintain and file accurate PSC information is a criminal offence. Penalties include:

• Daily default fines for officers of the company
• Up to two years' imprisonment for knowingly providing false PSC information
• Restrictions on shares: the company can serve a restrictions notice, preventing the transfer or voting of shares where a PSC has failed to respond to information requests

The Economic Crime and Corporate Transparency Act 2023 further strengthened these requirements, giving Companies House enhanced powers to query and reject PSC filings that appear inaccurate.

9. Register of Members and Share Capital

Every company with share capital must maintain a register of members (shareholders). This register records who holds shares, how many, and what class. While many companies now elect to keep this information on the central register at Companies House rather than maintaining a separate register, the obligation to ensure accuracy remains with the directors.

Key Filing Requirements

Share allotments are one of the most commonly missed filings. When a company issues new shares (whether to raise capital, admit a new shareholder, or convert loan notes) form SH01 must be filed within one month. Failure to file does not invalidate the allotment, but it is a criminal offence by the directors and can create significant problems when the company is later sold or refinanced.

10. Event-Driven Filings

Beyond the annual obligations, numerous company events trigger a requirement to file at Companies House within a specified period. Missing these deadlines is a criminal offence by the company's officers.

11. How a Fractional FD Manages Companies House Compliance

Most owner-managed businesses don't need a full-time finance director to manage Companies House compliance. What they need is someone who owns the process, a qualified professional who maintains a compliance calendar, ensures every filing is accurate and on time, and takes the cognitive load off the directors.

Here's what a fractional FD does for Companies House compliance:

• Maintains a 12-month compliance calendar with all filing deadlines, review dates, and accounting period-end dates
• Prepares or reviews annual accounts well before the filing deadline, typically 3–4 months in advance
• Files the confirmation statement (CS01) each year, verifying all company information is current
• Monitors PSC register changes and files updates within the 14-day window
• Coordinates with external accountants and auditors to ensure accounts are signed off in good time
• Manages event-driven filings (director changes, share allotments, charges, address changes) as they occur
• Reviews the company's size classification each year against current thresholds to ensure optimal filing regime
• Maintains the statutory books and registers, ensuring they are consistent with what is filed at Companies House

The value isn't in any single filing. It's in the system. A disciplined compliance process means no missed deadlines, no automatic penalties, no embarrassing gaps in the public register, and no anxious phone calls from your bank asking why your accounts are overdue.

12. Why BlackpeakCFO?

I'm Stuart Wilson, a CIMA-qualified management accountant (ACMA CGMA) with 24 years of institutional finance experience at Citigroup, ABN AMRO, and in private equity. I've managed reporting obligations for entities across multiple jurisdictions, dealt with regulators, and built the compliance infrastructure that institutional investors demand.

Now I bring that same rigour to UK owner-managed businesses. The companies I work with don't miss Companies House deadlines. They don't pay avoidable penalties. Their public register is clean, current, and reflects a well-run business. Because it is one.

If you're a director of a UK limited company and you're not 100% confident that every filing obligation is being met on time, we should talk. Not to sell you anything, but to make sure you're not sitting on a compliance problem that's about to become a penalty, a prosecution, or worse.

13. Frequently Asked Questions