Active participant
For purposes of this subsection, the term “active participant” means, with respect to any plan year, an individual—
(A) who is an active participant in— (i) a plan described in section 401(a) which includes a trust exempt from tax under section 501(a), (ii) an annuity plan described in section 403(a), (iii) a plan established for its employees by the United States, by a State or political subdivision thereof, or by an agency or instrumentality of any of the foregoing, (iv) an annuity contract described in section 403(b), (v) a simplified employee pension (within the meaning of section 408(k)), or (vi) any simple retirement account (within the meaning of section 408(p)), or
(B) who makes deductible contributions to a trust described in section 501(c)(18).
The determination of whether an individual is an active participant shall be made without regard to whether or not such individual’s rights under a plan, trust, or contract are nonforfeitable. An eligible deferred compensation plan (within the meaning of section 457(b)) shall not be treated as a plan described in subparagraph (A)(iii).