66.—(1) An administering authority may require a Scheme employer or former Scheme employer from which any payment under regulations 62 to 65 (employer’s contributions or payments) is overdue to pay interest on that amount.
(2) The date on which any amount due under regulation 62 (employer’s contributions), 63 (employer’s further payments) or 65 (additional costs arising from Scheme employer’s level of performance) is overdue is one month from the date specified by the administering authority for payment.
(3) The date on which any amount due under regulation 64 (payment by Scheme employers to administering authorities) (other than an extra charge payable under regulation 64 and referred to in regulation 64(1)(b)) is overdue is the day after the date when that payment is due.
(4) Interest payable under this regulation must be calculated at one per cent above base rate on a day to day basis from the due date to the date of payment and compounded with 3-monthly rests.