Dormant UK Companies: Annual Compliance and Filing Rules 2026

What "Dormant" Actually Means

A dormant company is one that has made no significant accounting transactions during the financial year. The precise definition matters, because HMRC's test is narrow and getting it wrong disqualifies you from the lighter filing and penalty rules.

For most accounting periods a company is dormant if all of the following are true:

• It has not traded (no sales, no services provided, no trading activity)
• It has not bought or sold any assets or investments
• It has not paid or received any money other than payments for shares or money lent/repaid to or from a director
• It has not paid anything to HMRC as a result of carrying on any trade or activity

That is a much narrower category than most founders assume. Letting a bank account earn a few pounds of interest, running a promotional discount, or paying a website subscription will disqualify the company from dormant status for that period.

Common disqualifiers:

• Interest or fees earned on a business bank account
• Refund of a deposit or repayment of a director's loan (check whether the loan route is available for your period)
• Selling a company asset, even at a loss
• Taking a trade payment, however small

[!WARNING] HMRC publishes the exact list. If you are unsure whether your company qualifies, assume it does not until you have checked, and file full accounts. Filing full accounts for a genuinely dormant company is safe. Claiming dormancy you do not have is not.

What You Must File Every Year

A dormant company still has two mandatory annual obligations.

1. Dormant Accounts

You must file accounts at Companies House every year, whether or not you traded. Dormant companies can file a simplified dormant balance sheet:

You must include a statement that the company has been dormant throughout the period and that no audit is required.

2. Confirmation Statement (CS01)

The CS01 is filed once every 12 months, regardless of trading status. It confirms that the company's registered office, directors and persons with significant control (PSCs) are correct and up to date.

Unlike accounts, a late CS01 carries an automatic penalty if it is 12 months or more overdue. Filing within the period but outside the review window is accepted without penalty.

[!IMPORTANT] Missing your CS01 for 12 months starts a process that can end with the company being struck off the register. That is not the same as voluntary dissolution — the assets pass to the Crown (bona vacantia). It is recoverable, but only if someone identifies the company and pays the restoration fee. In practice, dormant companies with no traceable assets are frequently never recovered.

Penalties and the Strike-Off Trap

Filing Accounts Late

Two consecutive late filings trigger an automatic financial penalty with no warning and no discretion.

Late Corporation Tax

If the company is dormant and genuinely inactive, there is usually no Corporation Tax to pay. But the CT600 must still be filed. A dormant company that fails to file gets:

• Late filing penalties of £300 then £900
• Late payment interest if there is a balance

HMRC introduced reduced late-filing penalties for dormant companies for accounting periods beginning on or after 1 April 2024. The reduction applies only where the failure relates solely to a dormant period and the return is otherwise compliant. The company must still file on time to qualify.

The Automatic Strike-Off Route

Companies House strikes off companies that fail to file accounts and the CS01. The sequence:

1. Company fails to file accounts
2. Companies House writes to the registered office
3. After a period, a second notice follows
4. The company is placed on the register of companies dissolved by gazette notice
5. After 3 years, it is struck off the register and dissolved
6. Assets — including bank balances, intellectual property and contract rights — vest in the Crown

Restoration is possible but not automatic, and it becomes materially harder the longer you wait.

Annual Cost of Keeping a Company Dormant

A correctly dormant company is close to free, but not zero.

The genuine cost is the registered office address. If the company has no trading activity, a registered office service is still legally required — you cannot simply use a friend's address indefinitely or keep using a service that has expired.

Our registered office address guide covers the address requirements in detail.

Why Founders Keep a Dormant Company

Brand and name protection. A registered company name blocks competitors from taking it while the company exists. This is genuinely valuable if you hold a domain, a trademark application, or a brand you are not yet trading under.

Company age. Some lenders, suppliers and marketplaces prefer or require an established incorporation date. Keeping a dormant entity lets you present continuous trading history when you activate.

Speculative opportunities. Reactivating a dormant company is materially faster than incorporating a new one — roughly a week against three to six. For time-sensitive opportunities such as tenders, marketplace entry or grant applications, that difference can matter.

Loan arrangements. A dormant company can take a director's loan and repay it within nine months, which can be useful for structuring funding.

[!WARNING] None of these reasons justify simply ignoring the filing obligations. The name protection that justifies keeping the company is destroyed by the strike-off that comes from not maintaining it — an incorporated name does not survive dissolution.

Reactivating a Dormant Company

Bringing a dormant company back to trading is straightforward:

1. Notify HMRC if the company has been registered as dormant with them
2. Resume normal accounting — accounts are no longer simplified
3. Start Corporation Tax if there was a dormant declaration
4. Notify Companies House of any changes to registered office, directors or PSC status
5. Use a new accounting reference date if helpful for your trading cycle
6. Tell your bank and any payment providers — dormant accounts are often closed

Most formation agents and accountants handle reactivation as part of their annual compliance work. The practical first step is establishing with your accountant what the dormant position has been, so the reactivation is clean.

Checklist

• Confirm the company genuinely meets HMRC's definition of dormant for the period
• File dormant balance sheet accounts at Companies House
• File the Confirmation Statement within the 12-month window
• Diary the next review date at least 30 days before the deadline
• Keep a valid registered office address in place
• Review whether the company is still worth maintaining — a dormant company with no name, IP or market value may not be
• Keep evidence of inactivity for any period claimed as dormant

Maintaining Compliance on a Dormant Company

Keeping a dormant company compliant is low effort but unforgiving of neglect. The two filings are small; the penalties and the strike-off consequence are not proportionate to them.

Our company secretary service handles the dormant accounts and CS01 filing on an annual basis, so the deadlines are tracked and nothing is missed.

View Company Secretary and Compliance Services

Reactivate or Form a UK Company — Get Advice

Related Guides

• UK Corporation Tax 2026: Rates, Deadlines and How to Pay Less — the full tax picture for a UK Ltd
• UK Registered Office Address Requirements 2026 — the address every company needs
• What Happens After You Register a Company? — your post-formation roadmap
• What is a Confirmation Statement? — the CS01 explained
• Close UK Company Online — DS01 Strike-Off Service — if you'd rather dissolve than maintain
• Form a UK Ltd From Abroad — Non-Resident Guide — for founders who haven't formed yet

Disclosure: UK LTD Registration may receive a commission if you sign up through our links. This helps us keep our guides free and up to date — at no extra cost to you.