Section 53.4960-6 - Applicability date(a)General applicability date. Sections 53.4960-0 through 53.4960-4 apply to taxable years beginning after December 31, 2021. Taxpayers may choose to apply §§ 53.4960-0 through 53.4960-4 to taxable years beginning after December 31, 2017, and on or before December 31, 2021, provided the taxpayer applies §§ 53.4960-0 through 53.4960-4 in their entirety and in a consistent manner.T.D. 9938, 86 FR 6219 , Jan. 19, 2021 T.D. 9938, 86 FR 6219 , 1/19/2021