83.—(1) In the circumstance prescribed by paragraph (2), an amount in respect of a Class 1A contribution that falls to be repaid in accordance with these Regulations may be set off against liabilities under them to the extent prescribed in paragraph (3).
(2) The circumstance is that an employer has paid to the Board in accordance with regulations 70 to 82 an amount, in respect of Class 1A contributions, which he was not liable to pay.
(3) The extent of the set-off is that the employer shall be entitled to deduct the amount which he was not liable to pay in respect of Class 1A contributions from any payment in respect of secondary earnings-related contributions which he is subsequently liable to pay to a Collector under paragraph 10 or 11 of Schedule 4 for any income tax period in the same year.
(4) In this regulation “Collector”, “income tax period” and “year” have the meanings given in paragraph 1(2) of Schedule 4.