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CTSA applies to companies for accounting periods ended on or after 1 July 1999.

CTSA imported the finality and enquiry rules of SA into the general administrative framework for corporation tax purposes.

It also brought into a single SA:

• tax chargeable under CTA10/S455 on loans or advances by close companies to participators,
• tax that was chargeable under ICTA88/S747 on the profits of controlled foreign companies for accounting periods ending on or before 31 December 2012.

You should read references in this guidance to ‘tax� and to ‘CT� accordingly, where the context requires.