Whenever any person who has drawn benefits under this chapter subsequently receives retroactive pay without deduction for such benefits under an arbitration, or other award or judgment with respect to the same period for which he has drawn unemployment compensation benefits, he shall be liable to repay to the administrator the amount of benefits so drawn upon demand. If the amount of unemployment compensation payments which he has received has been deducted from the amount paid to him by the employer, the employer shall be liable to pay the amount so deducted to the administrator, who shall accept and credit the same to the account of such person and such charged employer. If such person does not repay the sum or if an employer does not repay the amount deducted for benefits drawn, such sum shall be collectible in the manner provided in § 31-266 for the collection of past due contributions. All retroactive pay referred to in this section shall be deemed “wages” as said term is defined under the provisions of § 31-222, and will be reported by an employer under the taxable method for the quarter during which the payment is made. Every employer who has been required to make a retroactive payment, whether or not the amount of benefits is to be deducted from such payment, shall notify the administrator of such fact.