(a) Effective January 1, 1958, payments of insurance to a beneficiary under a United States Government life insurance policy shall be subject to levy for taxes due the United States by such beneficiary.

(b) The provisions of 38 U.S.C. 5301(b) which entitle the United States to collect by setoff out of benefits payable to any beneficiary under a United States Government life insurance policy do not apply to dividends being held to the credit of the insured for the payment of premiums under the provisions of section 1946 of title 38 U.S.C.