796Limits on credit: income tax
(1)The amount of the credit for foreign tax which, under any arrangements, is 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 section 795; 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, subsection (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 subsection has already been applied.
(3)Without prejudice to subsections (1) and (2) above, the total credit for foreign tax to be allowed to a person against income tax for any year of assessment under all arrangements having effect by virtue of section 788 shall not exceed the total income tax payable by him for that year of assessment, less any income tax which he is entitled to charge against any other person.