IRA Commercial Buildings Energy Efficiency Credit (179D): Compliance Requirements

File IRS Form 7205 with the tax return for the taxable year in which the energy-efficient property is placed in service, identifying yourself as building owner or designer and providing certification information.

Deadline: Due with federal tax return for the year property is placed in service

Source: IRS Form 7205 Instructions (12/2025); 26 USC 179D

If allocating the deduction to a designer (for government or tax-exempt-entity-owned buildings), obtain written allocation agreement from the building owner signed by authorized personnel and meeting Notice 2008-40 requirements.

Deadline: Allocation letter must be executed before or at the time the designer files Form 7205

Source: 26 USC 179D(a)(3); IRS Notice 2008-40, Section 3.04; Form 7205 Instructions

Reduce the tax basis of the energy-efficient property by the full amount of the 179D deduction claimed. Do not claim depreciation deductions for property costs attributable to the deduction.

Deadline: Basis reduction must be reflected on the tax return for the year the property is placed in service

Source: 26 USC 179D(b)(2); IRS Practice Unit IRC 179D

For property placed in service on or after January 30, 2023, ensure all laborers and mechanics are paid prevailing wages as determined by the Department of Labor, unless claiming only base deduction rate without wage enhancement.

Deadline: Wages must be paid throughout construction/installation period; certification of compliance due with Form 7205

Source: 26 USC 179D(a)(2); IRS Notice 2022-61; Form 7205

For property placed in service on or after January 30, 2023, meet apprenticeship hour requirements (registered apprentices working on installation) to claim enhanced deduction amounts.

Deadline: Apprenticeships must occur during property installation; compliance documentation due with Form 7205

Source: 26 USC 179D(a)(2)(C); IRS Notice 2022-61

Obtain third-party certification from a qualified engineer or licensed architect confirming that energy-efficient property achieves at least 25% annual energy cost savings compared to ASHRAE 90.1-2007 reference standard baseline.

Deadline: Certification must be completed before the tax return deadline for the year property is placed in service

Source: 26 USC 179D(c)(2); DOE compliance pathways; IRS Form 7205

For Alternative (Measurement) Pathway buildings: obtain certified pre-upgrade and post-upgrade energy use intensity data. Pre-upgrade data must be from within one year before improvements, post-upgrade data from more than one year after property placement in service.

Deadline: Post-upgrade certification not available until more than one year after retrofit property is placed in service

Source: 26 USC 179D(f); IRS Form 7205 Instructions; DOE guidance

Retain all documentation including the energy certification report, computer modeling files, energy savings calculations, and allocation letters for audit purposes.

Deadline: Maintain for the period the IRS can audit (typically 3-6 years after filing)

Source: 26 USC 179D(a)(3); IRS Practice Unit IRC 179D; multiple guidance notices

Comply with the 4-year building lifetime maximum deduction cap: aggregate deductions under 179D(a) and 179D(f) for a building cannot exceed the allowable cap in any 4-year rolling period for property placed in service after Dec. 31, 2022.

Deadline: Verify cumulative deductions do not exceed cap across prior 3 taxable years (or 4-year period for pass-through entities) when claiming deduction

Source: 26 USC 179D(b)(1); IRS Form 7205; Inflation Reduction Act amendments