§31.3121(b)-4 Employment; excepted services in general.

(a) Services performed by an employee for an employer do not constitute employment for purposes of the taxes if they are specifically excepted from employment under any of the numbered paragraphs of section 3121(b). Services so excepted do not constitute employment for purposes of the taxes even though they are performed within the United States, or are performed outside the United States on or in connection with an American vessel or American aircraft, or are performed outside the United States by a citizen of the United States for an American employer. If not otherwise provided in the regulations relating to the numbered paragraphs of section 3121(b), such regulations apply to services performed after 1954.