Under section 7476(d) the term "retirement plan" means a pension profitsharing, or stock bonus plan described in section 401(a), or a trust which is part of such a plan, an annuity plan described in section 403(a), or a bond purchase plan described in section 405(a). This procedure is available only to the employer, the plan administrator as defined in section 414(g), an employee who qualifies as an interested party as defined in this section, or the Pension Benefit Guaranty Corporation, where such person has an actual controversy involving a determination described in paragraph (a)(2)(ii) of this section. In the case of an application for such a determination, this procedure is available only if such determination or failure to make such determination is with respect to an application described in paragraph (b)(7) of this section. In addition, in the case of such an application, if a petitioner was the applicant for the determination, the Tax Court may hold, under section 7476(b)(2), the filing of a pleading for a declaratory judgment to be premature unless the petitioner establishes to the satisfaction of the Tax Court that such petitioner has caused the interested parties to be notified in accordance with this section and § 1.7476.2
In applying this paragraph (d)(2), plan provisions (with respect to which the determination regarding qualification is to be based) not in effect on the first date on which notice is given to interested parties shall be treated as though they were in effect on such date.
26 C.F.R. §1.7476-1