Except as otherwise provided in this section, in the case of the taxes imposed by sections
3101
(b) and
3111
(b) with respect to service performed in the employ of a State or any political subdivision thereof (or any instrumentality of any one or more of the foregoing which is wholly owned thereby), the return and payment of such taxes may be made by the head of the agency or instrumentality having the control of such service, or by such agents as such head may designate. The person making such return may, for convenience of administration, make payments of the tax imposed under section
3111 with respect to the service of such individuals without regard to the contribution and benefit base limitation in section
3121
(a)(1).