Company Dormancy Letter (UK)

A Company Dormancy Letter in the United Kingdom is a legally binding written instrument.

For Corporation Tax purposes, HMRC defines a dormant company as one that has had no 'significant accounting transactions' during its accounting period. A significant accounting transaction is any transaction that must be entered in the company's accounting records, such as receipt of income, payment of invoices, purchase of assets, or payment of dividends. Under Corporation Tax Act 2010, section 12, a company that has had no Corporation Tax liability for an accounting period may be excused from filing a Corporation Tax return (CT600) for that period if HMRC accepts its dormancy notification. Three types of transactions are permitted during a dormant period without affecting dormant status: payment of Companies House filing fees, payment of penalties to Companies House, and allotment of subscriber shares at incorporation.

For Companies House purposes, the definition of dormancy under section 1169 of the Companies Act 2006 is broadly similar but separately applied. A company can be dormant for Companies House purposes while still having some activity for HMRC purposes, or vice versa. Companies House requires dormant companies to continue filing their annual confirmation statement (under section 853 of the Companies Act 2006) and dormant company accounts, even though those accounts may consist only of a simplified balance sheet.

The Company Dormancy Letter is distinct from a company dissolution or strike-off application. A dissolution application (made on Form DS01 under section 1003 of the Companies Act 2006) permanently removes the company from the Companies House register and cannot be reversed except by a court order for restoration under section 1029 of the Companies Act 2006. Dormancy preserves the company as a live legal entity — protecting the company name, any intellectual property or contracts held by the company, and the option to resume trading in the future — while eliminating the Corporation Tax compliance burden during the inactive period.

Directors of a UK limited company have a continuing obligation under the Companies Act 2006 and the Corporation Tax Act 2010 to file accounts and to notify HMRC of changes in the company's tax position. Failing to notify HMRC of dormancy when a company ceases to trade, and failing to file Corporation Tax returns, can result in automatic filing penalties and interest charges under Schedule 55 of the Finance Act 2009.

A UK Company Dormancy Letter is needed whenever the directors of a limited company decide that the company will temporarily cease trading and want to confirm HMRC does not require Corporation Tax returns to be filed during the inactive period.

When a sole director company owner suspends trading to take extended leave, pursue other projects, or manage personal circumstances — without wishing to dissolve the company permanently — a dormancy notification to HMRC prevents Corporation Tax returns from being demanded for the dormant periods. HMRC's Corporation Tax office will confirm that no CT600 return is required for the period of dormancy once the notification is received and accepted.

When a holding company within a corporate group has no trading activity of its own — its sole function being to hold shares in subsidiary companies — the holding company is likely to be dormant for Corporation Tax purposes in any accounting period in which it receives no dividends, charges no management fees, and makes no disposals of assets. A dormancy letter to HMRC at the start of each accounting period in which no activity is expected is a straightforward compliance step that avoids unnecessary CT600 filing obligations.

When a company name is registered to protect a brand, product name, or intellectual property asset, with no current intention to trade under that name, the registered company will typically be dormant from the date of incorporation until commercial activity begins. A Company Dormancy Letter sent to HMRC shortly after incorporation notifies HMRC that the company is dormant and has no Corporation Tax liability, and requests that HMRC record the company accordingly on its CT register.

When a company's trading activities are temporarily suspended due to a regulatory review, a licensing dispute, or a pending business acquisition — but dissolution is not appropriate because the company's contracts, licences, or assets need to be preserved — a dormancy letter to HMRC manages the tax compliance position during the suspension period.

When a company has completed the wind-down of its trading activities in preparation for a members' voluntary liquidation but has not yet appointed a liquidator, the directors should notify HMRC of dormancy for the period between the cessation of trading and the commencement of the formal winding-up process under the Insolvency Act 1986.

A UK Company Dormancy Letter must include the following elements to be effective as a notification to HMRC that the company has ceased trading and has no Corporation Tax liability for the relevant period.

The company identification block must state the company's full registered name exactly as it appears on the Companies House register, the Companies House registration number, the company's Unique Taxpayer Reference (UTR) as assigned by HMRC, and the company's registered office address. The UTR is the primary identifier HMRC uses to locate the company's Corporation Tax record and is essential for the letter to be routed correctly within HMRC's Corporation Tax processing teams.

The dormancy start date must state the precise date from which the company became dormant — that is, the date on which the last significant accounting transaction occurred and from which the company has had no further trading activity. This date determines the start of the accounting period for which no Corporation Tax return will be required, and it should be consistent with the company's accounting records and the date from which no further transactions appear in the company's books.

The accounting period reference should state the accounting period or periods for which the company will be dormant. If the dormancy straddles the end of a Companies House accounting reference date — for example, the company became dormant on 15 August 2025 and the accounting reference date is 31 December 2025 — the letter should address the treatment of the period from the dormancy start date to the accounting reference date.

The no-Corporation-Tax-liability statement must confirm that the company has no Corporation Tax liability for the accounting period in which it became dormant and for any subsequent dormant accounting periods. This confirmation triggers HMRC's process for suspending the CT600 filing requirement. Without this statement, HMRC may continue to issue CT600 notices for filing and may impose automatic penalties under Schedule 55 of the Finance Act 2009 for non-filing.

The request to update HMRC records should expressly ask HMRC to record the company as dormant on its Corporation Tax register, to confirm that no CT600 return is required for the dormant period, and to advise the company when — or under what circumstances — Corporation Tax filing obligations will resume. HMRC will typically respond with a written confirmation, which the company should retain in its statutory books.

The director's signature and date block identifies the person authorising the notification. For a single-director company, the sole director signs. For multi-director companies, any director can notify HMRC of the company's dormancy. The letter should be dated on or before the date it is sent, and a copy should be retained in the company's registered office files or company secretarial records. The forms-legal.com Company Dormancy Letter (UK) template covers the mandatory elements under Companies Act 2006.