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IRS GuideWire December 23, 2022

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Issue Number:    A-2023-02
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Announcement 2023-02 [ [link removed] ] 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.

Date Placed In Service Applicable Reference Standard 90.1

Before 1/1/2015 Reference Standard 90.1-2001

After 12/31/2014 and before 1/1/2027* Reference Standard 90.1-2007

After 12/31/2026* Reference Standard 90.1-2019

* Taxpayers who begin construction before 1/1/2023 may apply Reference Standard 90.1-2007 regardless of when the building is placed in service.

Announcement 2023-02 will be in IRB: 2023-3, dated January 17, 2023.

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