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August 30, 2026
Does a New UK Company Need to Register for Corporation Tax?
A new UK limited company must register for Corporation Tax when it starts trading or becomes active for Corporation Tax purposes.
The company must generally notify HMRC within three months of the start of its Corporation Tax accounting period. A newly incorporated company that has not started doing business will usually be dormant and may not need to register until it becomes active.
The requirement applies even if the company makes a loss or does not expect to owe any Corporation Tax.
When a company is registered online through the official Companies House service, it may be set up for Corporation Tax at the same time.
If Corporation Tax was not set up during incorporation, the company must add Corporation Tax services to its HMRC business tax account when it starts doing business.
The directors should not assume that incorporation alone has completed every Corporation Tax step. They should check the company’s HMRC account and confirm that the correct trading start date has been recorded.
A company must generally tell HMRC that it is active within three months of starting its Corporation Tax accounting period.
This is commonly described as registering for Corporation Tax, although the online process may involve adding Corporation Tax services to the company’s business tax account.
The deadline runs from when the company becomes active—not necessarily from the date it was incorporated.
HMRC may consider a company active when it:
A company may be active before it receives its first customer payment.
For example, purchasing stock, advertising products or employing someone can indicate that the company has started business activities.
No. Corporation Tax registration is based on the company becoming active, not on whether it makes a profit.
A company may need to register even if it:
The loss may need to be reported through the Company Tax Return and could potentially be used according to the applicable loss-relief rules.
A company is generally dormant for Corporation Tax if it has not started trading and has no other taxable income.
Examples may include:
A dormant company does not normally need to pay Corporation Tax.
A company that remains dormant does not normally need to register as active for Corporation Tax.
If HMRC believes the company is active or sends a notice requiring a Company Tax Return, the directors should respond. The company may need to tell HMRC that it is dormant.
After HMRC accepts the dormant status, the company will not normally need to file further Company Tax Returns unless:
A dormant company must still meet its Companies House obligations.
Yes. Dormant status does not remove the company’s Companies House responsibilities.
A dormant limited company will normally still need to:
Corporation Tax dormancy and Companies House dormancy are related but legally distinct concepts.
Opening an account by itself may not always mean that the company has started trading.
However, the company could become active if it:
The directors should examine the nature of each transaction rather than assuming that an open account has no tax effect.
Certain formation-related transactions do not necessarily mean that the company is trading.
For Companies House dormancy purposes, transactions such as the payment for initial shares and certain filing fees are generally disregarded.
However, Corporation Tax dormancy uses a separate test. If the company starts advertising, buying stock, employing people or receiving income, it may become active even if it has not yet made a sale.
A company may incur expenses before its trade formally begins.
These could include:
Some pre-trading expenditure may qualify for tax relief once the company begins trading, subject to the applicable conditions.
However, certain activities—particularly advertising, purchasing goods and employing staff—may indicate that the company is already active. The correct start date should be confirmed with an accountant where the position is unclear.
The company normally registers by adding Corporation Tax services to its HMRC business tax account.
It may need:
The Government Gateway account should belong to the company. Directors should avoid using personal credentials where the service requires a separate company account.
The Corporation Tax Unique Taxpayer Reference is a ten-digit number issued by HMRC.
It is normally sent to the company’s registered office after incorporation.
The company may need the UTR to:
If the UTR does not arrive, the company can request it from HMRC after checking that its registered office address is correct.
The accounting period is the period covered by the Company Tax Return.
It usually starts when the company begins trading or becomes active and normally ends on the company’s accounting reference date.
A Corporation Tax accounting period cannot be longer than 12 months.
The company’s first statutory accounts may cover more than 12 months. In that situation, it may need to file two Company Tax Returns covering the same overall accounts period.
For most small companies, Corporation Tax is normally due nine months and one day after the end of the relevant accounting period.
Larger companies may have to pay Corporation Tax through instalments under different rules.
The payment deadline comes before the deadline for filing the Company Tax Return.
A Company Tax Return is normally due 12 months after the end of the accounting period it covers.
The return may need to include:
Yes, if the company is active or HMRC has issued a notice requiring a Company Tax Return.
A return may still be required when the company:
The absence of a tax bill does not automatically remove the filing obligation.
No. A UK-incorporated company will normally remain subject to UK Corporation Tax requirements even if its directors or shareholders live overseas.
International ownership may create additional considerations involving:
Non-resident owners should obtain advice covering both the UK and their country of residence.
A UK-resident company may pay Corporation Tax on taxable profits arising from:
Allowable expenses and reliefs can reduce taxable profits, but company accounting profit and taxable profit are not always the same.
Yes. An accountant or tax adviser can assist with registration and act as the company’s agent.
However, the directors remain responsible for:
The company should retain access to its tax records and keep copies of all filings.
Late notification may result in penalties, particularly if the company also fails to pay tax or submit a required return on time.
Possible consequences include:
The company should contact HMRC promptly if it has started trading but has not completed its Corporation Tax registration.
A new company should:
A new UK company must register for Corporation Tax when it starts trading or otherwise becomes active.
The company should generally notify HMRC within three months of the start of its Corporation Tax accounting period. It may need to register even if it makes a loss or has no tax to pay.
A company that has not started business and has no other income will usually be dormant. It may not need to register as active until trading begins, but it must still file the required accounts and confirmation statements with Companies House.
This article provides general information and does not constitute legal, tax or financial advice.
