89. Restrictions on the allowance.

A company is entitled to a single annual investment allowance in respect of all the qualifying activities carried on by it in a chargeable period1.

A company which, in a financial year, is a parent undertaking of one or more other companies, and those other companies, are entitled to a single annual investment allowance between them in respect of the relevant AIA qualifying expenditure2.

Where in a financial year two or more groups of companies are controlled3 by the same person and related4 to one another, the companies which are the members of those groups are entitled to a single annual