Companies in a group (defined as for the purposes of group relief: see ¶735-100ff) are able to offset, by surrender, underpayments and overpayments of tax, within the group. This will affect any exposure to interest on overdue tax payable by (or overpaid tax payable to) any individual company. An election for such a surrender must be made jointly by the two companies concerned, by notice to HMRC. The provisions are included in CTA 2010, Part 22, Ch. 4 (Surrender of tax refund within group), below.