Corporation Tax Act 2010 section 357I

The Northern Ireland rate

Section 357I explains how the Northern Ireland corporation tax rate is determined for each financial year, including what happens when the Northern Ireland Assembly does or does not set a rate.

• If the Northern Ireland Assembly passes a resolution setting a rate for a financial year before that year begins, that rate applies as the Northern Ireland rate.
• If no rate is set for a particular year, but the Assembly had set a rate for an earlier year, the most recent previously set rate carries forward.
• If the Assembly has never set a rate, the Northern Ireland rate defaults to the UK main rate of corporation tax.
• A resolution setting a rate is treated as if it was never passed if it is cancelled by a further Assembly resolution before the financial year begins.