Finance Act 1965

3 (1) The amount of the credit for foreign tax to be allowed to a person against income tax for any year of assessment shall not exceed the difference between the amounts of income tax which would be borne by him for the year (no credit being allowed for foreign tax)—

(a) if he were charged to tax on his total income for the year, computed in accordance with paragraph 2 above; and

(b) if he were charged to tax on the same income, computed in the same way, but excluding the income in respect of which the credit is to be allowed.

(2) Where credit for foreign tax is to be allowed in respect of income from more than one source sub-paragraph (1) above shall be applied successively to the income from each source, but so that on each successive application paragraph (a) shall apply to the total income exclusive of the income to which the sub-paragraph has already been applied.

(3) Without prejudice to sub-paragraphs (1) and (2) above the total credit to be allowed to a person against income tax for any year of assessment for foreign tax under all arrangements having effect by virtue of section 347 of the [1952 c. 10.] Income Tax Act 1952 shall not exceed the total income tax payable by him for that year of assessment, less any tax which he is entitled to charge against any other person.