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

Most UK private limited companies must file their annual accounts at Companies House within 9 months of the end of their accounting period. Miss it by even a day and Companies House applies an automatic penalty, starting at £150, with no warning letter first.

The accounting reference date of your business determines the filing deadline; most private limited firms must file their accounts within nine months after the end of the financial year. Even while this would seem like plenty of time, firms may miss the deadline if bookkeeping, account preparation, or director permission are delayed. 

This blog outlines the regulations pertaining to Companies House accounts filing deadline in 2026, including crucial dates, late filing fines, typical reasons why submissions are missed, and how companies can get ready ahead of time to prevent expensive errors.

When Are Your Company Accounts Due? (The Standard Deadline) 

Within nine months following the conclusion of their accounting reference period, UK private limited firms are required to submit their annual accounts to Companies House. The deadline is not dependent on the end of the tax year, but rather on the date of your company’s financial year. For instance, your accounts must typically be submitted by December 31, 2026, if your accounting period ends on March 31, 2026. 

The rules depend on the type of company: 

• Existing private limited companies: File annual accounts within 9 months of the end of the accounting period. 
• Public limited companies: File annual accounts within 6 months of the end of the accounting period.
• First accounts after incorporation: Private companies must file their first accounts within 21 months from the date of incorporation. Public companies must file within 18 months.

The deadlines for filing with Companies House are set and cannot be extended just because accounts preparation takes longer than expected. Even a one-day delay will result in a late filing penalty from Companies House if your business misses the deadline. 

First-Year Accounts: Why Your Deadline Is Different 

Since they span the time from incorporation to the first accounting reference date, a company’s first accounts have a distinct filing deadline. The deadline provides new businesses with more time to produce their initial set of accounts. 

Key points about first-year accounts deadlines: 

• Private limited companies: Within 21 months of the date of establishment, the first accounts must be submitted to Companies House. 
• Public limited companies (PLCs): Within eighteen months after establishment, first accounts must be filed. 
• First accounting period: The period from the date of incorporation to the first accounting reference date is typically covered by a company’s initial accounts. 
• Maximum accounting period: The initial accounting period of a business may be more than 12 months, but it cannot be greater than 18 months. 
• After the first filing: The typical reporting deadline for future annual accounts for private corporations is nine months following the conclusion of the company’s accounting period. 
• Example: A private company incorporated on 1 April 2026 will normally need to file its first accounts by 1 January 2028. 
• Separate tax deadlines: The HMRC deadlines for Corporation Tax registration, payment, and Company Tax Return submission differ from the Companies House accounts filing deadline. 
• Early preparation matters: To guarantee that accounts can be created and filed accurately before the deadline, new firms should maintain accurate bookkeeping records from the beginning. 

How to Find Your Exact Companies House Filing Deadline 

Your Companies House filing deadline is calculated from your company’s accounting reference date (ARD), which is the end of your financial year. Your ARD is by default the last day of the month in which your business was formed; for example, a business that was incorporated on March 15, 2025, would have an ARD of March 31. Your first ARD occurs on the first anniversary of that month’s end (in this case, March 31, 2026). Unless you modify it, it then recurs on the same day each year. Your ARD and the date of your upcoming set of accounts are displayed on the Companies House register’s overview page for your business. 

To check your filing deadline: 

• Visit your company record on Companies House: Look up the “Filing history” or company information page by searching for your company name. 
• Find your accounting reference date: This indicates the time frame that your yearly accounts must cover and help in figuring out when you must file. 

• Calculate the deadline: 
  • Private limited companies must file accounts within 9 months after the end of their accounting period.
  • Public limited companies must file accounts within 6 months after the end of their accounting period.

• Check your first accounts deadline: The first accounts deadline is different for newly incorporated companies and is determined by the date of incorporation. 

• Review any changes to your accounting period: The filing deadline may alter if your company’s accounting term has been shortened or prolonged. 

Example: 

Your annual accounts must typically be filed by March 31, 2027, which is nine months after the year-end, if your company’s accounting period finishes on June 30, 2026. 

Directors are in charge of making sure that accounts are submitted on schedule. You may prepare records, take care of any accounting problems, and prevent late filing fines if you check your deadline well in advance. 

Companies House Deadline vs HMRC Deadline: Don’t Confuse the Two 

Companies in the UK are required to fulfill independent dates set by HMRC and Companies House. The requirement to file a Corporation Tax Return to HMRC is not eliminated by filing yearly accounts with Companies House. Businesses can prevent missed deadlines and needless fines by being aware of the distinction. 

Aspect	Companies House Deadline	HMRC Deadline
What you need to file	Annual accounts showing your company’s financial activities and financial position	Company Tax Return (CT600) showing taxable profits and Corporation Tax calculation
Organisation receiving the information	Companies House	HM Revenue & Customs (HMRC)
Purpose	Make sure your business complies with its legal filing requirements and maintains an accurate public record.	Allows HMRC to assess Corporation Tax liability and collect the correct tax amount
Accounts filing deadline (private limited company)	Usually 9 months after the end of the company’s accounting period	Not applicable for accounts filing
Corporation Tax payment deadline	Not applicable	9 months and 1 day after the end of the accounting period
Example: Accounting period ends 31 March 2026	Accounts due by 31 December 2026	Corporation Tax payment due by 1 January 2027; Company Tax Return due by 31 March 2027
Late filing penalty	£150 to £1,500 (private), automatic from the first day late	Fixed penalty from £200, rising for returns more than 3, 6, or 12 months late, for any CT600 with a filing deadline on or after 1 April 2026

What Happens If You Miss the Companies House Deadline 

An automatic late filing penalty will be applied to your business if you fail to file your Companies House accounts by the deadline. Even if the delay was brief and your accounts are accurate, the penalty still applies. Unless there is a legitimate unusual scenario, Companies House typically does not waive penalties. 

The penalty depends on how late the accounts are and whether your company has filed late before. If your accounts are late for a second financial year in a row, the applicable penalty for that band is automatically doubled, on top of whatever penalty applied the first time.

The late filing penalties include: 

How late the accounts are filed	Penalty for a private limited company	Private (doubled)	Penalty for a public company	Public (doubled)
Up to 1 month late	£150	£300	£750	£1,500
More than 1 month but not more than 3 months late	£375	£750	£1500	£3,000
More than 3 months but not more than 6 months late	£750	£1,500	£3,000	£6,000
More than 6 months late	£1,500	£3,000	£7,500	£15,000

Missing your deadline is also not just a Companies House matter. Directors have a statutory duty under section 441 of the Companies Act 2006 to deliver accounts on time, and persistent or serious failure to file can lead to compulsory strike off action against the company and, in the most serious cases, director disqualification. If your accounts are already overdue, file them as soon as possible. The penalty is fixed at the point Companies House receives your accounts, so every extra day of delay risks pushing you into a higher penalty band.

Can You Extend Your Filing Deadline? 

Yes, but not in the manner that most directors think. The more beneficial of the two ways is the one that people choose to ignore. Before your current deadline expires, both must be used. 

Since your ARD determines your filing deadline, altering your ARD will alter the deadline. No special circumstances are needed for this ordinary, free filing, which is accessible to any business.

Your new deadline is whichever of these occurs later after Companies House receives an AA01: 

• 9 months from the new ARD (6 months for a public company), or
• 3 months from the date Companies House receives the form

It’s the second limb that matters. Shortening your financial year by just one day near your current deadline can buy up to three extra months because it starts on the date of receipt rather than your year-end. 

Example: Your ARD is 31 March 2026, so accounts are due by 31 December 2026. On 1 November 2026, you file an AA01 shortening the year-end by one day to 30 March 2026. Nine months from the new ARD is 30 December 2026; three months from receipt is 1 February 2027. The later date wins, so your deadline moves to 1 February 2027. 

If you have already missed the deadline, this route no longer applies, since it must be used before your current deadline passes. Once a penalty has been issued, Companies House will only consider an appeal where the delay was caused by something genuinely outside your control, such as a serious illness, a fire or theft affecting your records, or a failure of the Companies House filing system itself. Appeals must be submitted in writing with supporting evidence. Being busy, short staffed, or waiting on a client for information does not count as a valid reason.

Special Cases: Dormant Companies and Weekend Deadlines 

When filing accounts, certain businesses take different factors into account, especially those that are dormant or whose filing deadlines coincide with a weekend or public holiday. 

Dormant Companies: Even if they haven’t engaged in any trading activity throughout the accounting period, dormant firms must nonetheless submit accounts to Companies House. 

Weekend and Bank Holiday Deadlines: Companies House deadlines are based on calendar dates. If your filing deadline falls on a weekend or bank holiday, you should not assume that the deadline automatically moves to the next working day.

What 2026 Changes Mean for Your Filing Obligations 

In 2026, UK companies will need to adjust to new compliance requirements brought about by the Economic Crime and Corporate Transparency Act while still fulfilling their Companies House filing obligations. Companies are now subject to more scrutiny about the accuracy of information supplied to Companies House and the identity verification procedures for directors and people with significant control (PSCs), even if the usual regulations surrounding the annual accounts due date have not altered. 

The annual accounts due date for the majority of private limited firms is still nine months following the end of the business’s financial period. However, directors must make sure they are ready for further inspections, keep correct company documents, and finish any necessary identity verification procedures on time.  If you are not sure which identity verification deadline applies to you, our guide to the Companies House director ID verification deadline explains how it is tied to your confirmation statement date.

Two other 2026 changes are worth flagging. From 1st April 2026, HMRC’s fixed penalty for a late Company Tax Return rose from £100 to £200, with steeper penalties for returns more than three months late and for companies with repeated late filings. And from 1 February 2026, Companies House increased several of its own filing fees, including the annual confirmation statement, which now costs £50 rather than £34. Neither change affects the Companies House accounts deadlines set out above, but both add to the cost of falling behind.

Who Else Needs a Copy of Your Accounts? 

Depending on the legal and financial requirements of your business, copies of your yearly accounts may need to be distributed to multiple parties. 

The main recipients of company accounts include: 

• Companies House: To fulfill their statutory reporting obligations and maintain the public register current, all limited firms are required to submit yearly accounts to Companies House. 

• Shareholders: A copy of the yearly accounts must be given to shareholders so they may comprehend the company’s performance and financial status. 

• HMRC: The computation of corporation tax and the production of your company tax return are supported by the information from your accounts. 

• Company directors: Directors are legally responsible for making sure the accounts are accurate and must examine and approve them before submitting them. 

• Investors: Accounts may be reviewed by current or prospective investors to evaluate company performance and prospects for future expansion. 

How Cox Hinkins Keeps Your Business Ahead of Every Deadline

Cox Hinkins has been advising Oxford businesses on compliance and accounts preparation for over 50 years, and we are an ICAEW registered chartered accountancy practice. Our team tracks every client’s accounting reference date and filing deadline as a matter of course, so accounts are prepared and reviewed well ahead of the Companies House cut off rather than in the final days before it. If your filing history has been unpredictable in the past, or you are approaching your first year end as a new company, we can review your position and confirm exactly which deadline applies to you.

FAQs: Frequently Asked Questions

Conclusion

It is a duty of UK business to be aware of the Companies House accounts filing deadline in order to maintain compliance and prevent needless fines. While new businesses and public firms have differing deadlines, the majority of private limited companies are required to file their annual accounts within nine months of the end of their accounting period.

Missing the deadline may result in automatic penalties, problems with compliance, and possible harm to the public image of your business. Businesses can avoid last minute pressure and retain good status with Companies House by maintaining correct financial records, preparing accounts early, and keeping track of important filing dates.

With the proper procedures in place, fulfilling your filing requirements is a lot simpler, freeing you up to confidently concentrate on managing and expanding your company.

If you are facing any issues with your Companies House filing, talk to our team at Cox Hinkins.