A-2023-01: Updated Reference Standard 90.1 for § 179D

Announcement 2023-01 affirms the applicable Reference Standard 90.1 for purposes of the deduction for energy efficient commercial building property expenditures under § 179D of the Internal Revenue Code. Specifically, this announcement is effective on January 1, 2023 and affirms that Reference Standard 90.1-2019 is the applicable Reference Standard 90.1 for energy efficient commercial building property placed in service after 2026. The announcement also provides the following table to clarify the applicable Reference Standard 90.1 based on when property is placed in service, except that property the construction of which began before January 1, 2023 may apply Reference Standard 90.1-2007.

Announcement 2023-01 will be in IRB: 2023-01, dated January 01, 2023.

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