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The corporation tax self assessment (CTSA) regime applies to companies and deals with the administration and payment of corporation tax. Corporation tax may be due on profits from:

1. •

   undertaking business as a limited company

2. •

   a foreign company with a UK permanent establishment

3. •

   a club, co-operative or other unincorporated association such as a community group or sports club

See the Charge to corporation tax guidance note for further details of which entities are chargeable.

It is the responsibility of the company to calculate how much corporation tax is due for each accounting period (ie it is a self assessment regime).

Companies have an obligation to notify HMRC within three months when their first chargeable accounting period begins or when they come back within the charge to corporation tax after a period of dormancy (see ‘Dormant companies’ below). If this notice is not received, HMRC must be notified in writing within 12 months of the end of the period that the company is chargeable (see the ‘Duty to give notice of chargeability