Rev. Rul. 2020-19, page 611.

This revenue ruling provides guidance on what constitutes a change in basis of computing life insurance reserves under § 807(f) of the Internal Revenue Code, as amended by the Tax Cuts and Jobs Act. This revenue ruling provides specific holdings in a number of different situations, with each holding indicating whether the described situation is a change in basis under § 807(f).

T.D. 9905, page 614. This document contains final regulations providing guidance about the limitation on the deduction for business interest expense. The regulations provide guidance to taxpayers on how to calculate the limitation, what constitutes interest for purposes of the limitation, which taxpayers and trades or businesses are subject to the limitation, and how the limitation applies in consolidated group, partnership, international, and other contexts.