Notice 2021-55, page 461.

This notice explains the circumstances under which the four-year replacement period under section 1033(e)(2) is extended for livestock sold on account of drought. The Appendix to this notice contains a list of counties that experienced exceptional, extreme, or severe drought conditions during the 12-month period ending August 31, 2021. Taxpayers may use this list to determine if any extension is available.

T.D. 9956, page 449. These final regulations under sections 250 and 951A address the calculation of qualified business asset investment for qualified improvement property under the alternative depreciation system. These final regulations also contain transition rules relating to the impact on loss accounts of net operating loss carrybacks allowed by reason of the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”).