(a) Until the mortgage is paid in full or until receipt by the Commissioner of an application for insurance benefits, or until the contract of insurance is otherwise terminated with the consent of the Commissioner, the mortgagee, on each anniversary of the date of the first principal payment, shall pay an annual mortgage insurance premium equal to one-half of one percent of the average outstanding principal obligation of the mortgage for the year following the date on which such premium becomes payable.

(b) The provisions of paragraph (a) of this section shall apply to operating loss loans and to supplementary loans.