Section 357JHA | Availability of relief
From legislation.gov.uk
(1)The reference in section 188BB(1)(a) (group relief for carried-forward losses: surrendering of carried-forward losses and other amounts) to a loss carried forward to an accounting period of a company under section 45A(4) is, where a company has Northern Ireland losses or mainstream losses carried forward to an accounting period under that section, a reference to those Northern Ireland losses or mainstream losses.
(2)Where—
(a)a company makes a claim for group relief for carried-forward losses under Part 5A in relation to a surrenderable amount that is a Northern Ireland loss, and
(b)the profits against which the relief is claimed include some profits that are Northern Ireland profits and some that are not,
the relief in relation to that surrenderable amount is given first, so far as possible, against the Northern Ireland profits.
(3)Where—
(a)a company makes a claim for group relief for carried-forward losses under Part 5A in relation to a surrenderable amount that is not a Northern Ireland loss, and
(b)the profits against which the relief is claimed include some profits that are Northern Ireland profits and some that are not,
the relief in relation to that surrenderable amount is given first, so far as possible, against the profits that are not Northern Ireland profits.