26 CFR 1.1366-5: -5 Effective/applicability date.

(a) Sections 1.1366-1, 1.1366-2(a)(1), and 1.1366-2(b) through 1.1366-4 apply to taxable years of an S corporation beginning on or after August 18, 1998.

(b) Section 1.1366-2(a)(2) applies to indebtedness between an S corporation and its shareholder resulting from any transaction occurring on or after July 23, 2014. In addition, S corporations and their shareholders may rely on § 1.1366-2(a)(2) with respect to indebtedness between an S corporation and its shareholder that resulted from any transaction that occurred in a year for which the period of limitations on the assessment of tax has not expired before July 23, 2014.

(c) Sections 1.1366-2(a)(3) through (7), and this section apply on and after July 23, 2014. For rules that apply before that date, see 26 CFR part 1 (revised as of April 1, 2014).