In general. Under section 4965(c), the term “tax-exempt entity” refers to entities that are described in sections 501(c), 501(d), or 170(c) (other than the United States), Indian tribal governments (within the meaning of section 7701(a)(40)), and tax-qualified pension plans, individual retirement arrangements and similar tax-favored savings arrangements that are described in sections 4979(e)(1), (2) or (3), 529, 457(b), or 4973(a). The tax-exempt entities referred to in section 4965(c) are divided into two broad categories, non-plan entities and plan entities.

Non-plan entities. Non-plan entities are—

Entities described in section 501(c);

Religious or apostolic associations or corporations described in section 501(d);

Entities described in section 170(c), including states, possessions of the United States, the District of Columbia, political subdivisions of states and political subdivisions of possessions of the United States (but not including the United States); and

Indian tribal governments within the meaning of section 7701(a)(40).

Plan entities. Plan entities are—

Entities described in section 4979(e)(1) (qualified plans under section 401(a), including qualified cash or deferred arrangements under section 401(k) (including a section 401(k) plan that allows designated Roth contributions));

Entities described in section 4979(e)(2) (annuity plans described in section 403(a));

Entities described in section 4979(e)(3) (annuity contracts described in section 403(b), including a section 403(b) arrangement that allows Roth contributions);

Qualified tuition programs described in section 529;

Eligible deferred compensation plans under section 457(b) that are maintained by a governmental employer as defined in section 457(e)(1)(A);

Arrangements described in section 4973(a) which include—

Individual retirement plans defined in section 408(a) and (b), including—

Simplified employee pensions (SEPs) under section 408(k);

Simple individual retirement accounts (SIMPLEs) under section 408(p);

Deemed individual retirement accounts or annuities (IRAs) qualified under a qualified plan (deemed IRAs) under section 408(q); and

Roth IRAs under section 408A.

Arrangements described in section 220(d) (Archer Medical Savings Accounts (MSAs));

Arrangements described in section 403(b)(7) (custodial accounts treated as annuity contracts);

Arrangements described in section 530 (Coverdell education savings accounts); and

Arrangements described in section 223(d) (health savings accounts (HSAs)).

Effective/applicability dates. See § 53.4965-9 for the discussion of the relevant effective and applicability dates.