When Do I Need to File Company Accounts with Companies House

At Towerstone Accountants we provide specialist limited company accountancy services for directors and owner managed businesses across the UK. We wrote these guides for people running a company who want clear answers on tax, payroll, Companies House duties, and day to day compliance without jargon. Our aim is to help you understand your responsibilities, reduce the risk of penalties, and know when to get professional support.

This is one of the most important compliance questions for any company director and it is also one of the easiest to get wrong if it is not properly explained. In my work as a chartered accountant I regularly see directors caught out by missed deadlines simply because they did not fully understand when accounts are due what period they cover or how the rules change over time.

In this article I want to explain clearly and practically when you need to file company accounts with Companies House how deadlines are calculated what happens if you miss them and how this fits alongside your tax obligations. I am writing this in the first person based on how I advise my own UK limited company clients and everything here aligns with current guidance from Companies House HM Revenue and Customs and GOV.UK.

Why Companies House filing deadlines matter

Companies House deadlines are not optional and they are not flexible. Filing late does not just create paperwork issues it can trigger automatic penalties damage your company’s public record and in some cases raise red flags with HMRC lenders or suppliers.

Your company accounts filed at Companies House are public documents. They show that your business is being run properly and that directors are meeting their legal responsibilities. Missing deadlines suggests poor governance even if the underlying business is healthy.

What company accounts are filed with Companies House

Before looking at deadlines it helps to understand what Companies House actually expects to receive.

For most limited companies this means:

• Statutory annual accounts prepared under UK accounting standards

• A balance sheet signed by a director

• Notes to the accounts

• A directors’ report unless exemptions apply

Small and micro entity companies can usually file abridged versions known as filleted accounts which contain less detail but still meet legal requirements.

These accounts are different from your Corporation Tax return and different again from any management accounts you might use internally.

Your first Companies House accounts deadline

The first year causes the most confusion because the deadlines are longer and the accounting period can be more than 12 months.

When you form a limited company you have:

• Up to 21 months from the date of incorporation to file your first accounts

This does not mean your first accounting period must be 21 months but it often can be.

For example:

• If your company is incorporated on 1 June 2024

• Your first accounts must be filed by 28 February 2026

Those accounts can cover a period of up to 18 months depending on how you set your accounting reference date.

I always advise directors to confirm this date early because it drives every future deadline.

Subsequent Companies House accounts deadlines

After the first year the rules are much simpler.

For established companies:

• Accounts must be filed within 9 months of the accounting period end

So if your year end is 31 March your accounts must be filed by 31 December of the same year.

This deadline is fixed regardless of whether your accountant is busy whether you are waiting for information or whether the business has been quiet.

Accounting reference dates and why they matter

Your accounting reference date sets the end of your financial year. It appears on the Companies House register and determines your filing deadlines.

Most companies choose a year end that aligns with:

• The tax year

• Seasonal trading cycles

• Group reporting where applicable

You can change your accounting reference date but there are rules around how often and by how much. Changing it can move your filing deadlines forward or backward so it should be done carefully.

What happens if you file late

Late filing penalties are automatic and unavoidable. Companies House does not accept excuses and penalties apply even if no tax is due.

Current penalties for late filing include:

• 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

If you file late two years in a row the penalties are doubled.

In addition to financial penalties persistent late filing can result in compulsory strike off action which is far more serious.

The difference between Companies House and HMRC deadlines

One of the most common mistakes I see is directors assuming that Companies House and HMRC deadlines are the same. They are not.

Companies House deadlines relate to:

• Public statutory accounts

HMRC deadlines relate to:

• Corporation Tax returns and computations

Corporation Tax returns are usually due:

• 12 months after the end of the accounting period

Corporation Tax itself is normally payable:

• 9 months and 1 day after the period end

This means you often have three separate deadlines to manage. Accounts to Companies House tax payment to HMRC and the tax return itself.

Filing accounts when your company is dormant

If your company is dormant the filing obligations still exist although the accounts are simpler.

A dormant company must:

• File dormant accounts with Companies House

• File them by the same deadlines as active companies

Dormant accounts typically include:

• A simplified balance sheet

• Minimal notes

Failure to file dormant accounts still results in penalties.

What if your company has not traded at all

Even if your company has never traded you still need to file accounts.

Until a company is formally dissolved it has legal filing obligations. I often see directors assume that inactivity removes the requirement to file which is incorrect.

What happens if you change your year end

Changing your accounting reference date can result in shorter or longer accounting periods.

This affects:

• The period covered by the accounts

• The filing deadline

• The alignment with Corporation Tax periods

When you shorten a year the filing deadline usually moves forward. This can catch directors out if it is not planned properly.

Accounts filing during company closure

If you are closing your company the obligation to file accounts does not stop immediately.

You may need to file:

• Final accounts to the date trading ceased

• Accounts up to the date of dissolution depending on timing

This is particularly important if you are applying for voluntary strike off. Companies House can and does object to strike off applications where filings are outstanding.

How Companies House enforces filing rules

Companies House enforcement is largely automated.

This includes:

• Automatic penalty notices

• Reminder letters and emails

• Strike off warnings for persistent non compliance

Once a compulsory strike off process starts it can be difficult to stop without bringing all filings up to date.

Why relying on reminders is risky

Companies House does issue reminders but relying on them is risky.

Reminders can be:

• Sent to old email addresses

• Missed or filtered

• Delayed

The legal responsibility to file on time always sits with the directors regardless of whether a reminder was received.

How an accountant helps you meet Companies House deadlines

One of the most valuable roles of an accountant is managing compliance timelines so you do not have to.

I help my clients by:

• Confirming accounting reference dates

• Preparing accounts well before deadlines

• Coordinating Companies House and HMRC filings

• Monitoring changes in filing rules

• Acting quickly if something unexpected arises

This removes stress and allows directors to focus on running the business.

Common mistakes I see directors make

There are a few recurring issues that cause unnecessary penalties.

These include:

• Confusing HMRC and Companies House deadlines

• Assuming inactivity removes filing obligations

• Leaving accounts until the last minute

• Changing year ends without advice

• Filing incomplete or incorrect accounts

Most of these are easily avoided with early planning.

What happens if accounts are rejected

If Companies House rejects your accounts the filing date is not protected.

This means:

• The deadline still applies

• Penalties can still be charged

• Corrections must be made quickly

Rejections often happen due to formatting errors missing signatures or incorrect dates.

Digital filing and software considerations

Most companies now file accounts digitally either through accounting software or Companies House WebFiling.

Digital filing is faster but still requires:

• Correct tagging

• Accurate figures

• Director approval

Technology helps but it does not remove responsibility.

Directors’ legal responsibility

It is important to be clear that even if you use an accountant the legal responsibility for filing accounts on time rests with the directors.

An accountant supports the process but directors remain accountable under company law.

Final thoughts

Knowing when to file company accounts with Companies House is a fundamental part of running a limited company in the UK. The rules are clear but the details matter and small misunderstandings can lead to penalties reputational damage and unnecessary stress.

In my experience the best approach is to understand your deadlines early treat them as fixed points in your business calendar and work with an accountant who keeps you informed and ahead of time. When compliance is handled properly it becomes routine rather than something that keeps you awake at night.

You may also find our guidance on What happens if I file my company accounts late and What does confirmation statement overdue mean helpful when exploring related limited company questions. For a broader overview of running and managing a company, you can visit our limited company hub.