26 CFR §1.145-1

1. (a)Overview. Interest on a private activity bond is not excludable from gross income under section 103(a) unless the bond is a qualified bond. Under section 141(e)(1)(G), a qualified 501(c)(3) bond issued under section 145 is a qualified bond. Under section 145, a qualified 501(c)(3) bond is any bond issued as a part of an issue that satisfies the requirements of sections 145(a) through (d).
2. (b)Scope. Sections 1.145-0 through 1.145-2 apply for purposes of section 145(a).
3. (c)Effective dates. For effective dates of §§ 1.145-0 through 1.145-2, see § 1.141-15.