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IRC Section 179D Energy-Efficient Commercial Building Tax Deduction

A Federal Tax Incentive for Energy-Efficient Commercial Buildings

IRC Section 179D is a federal tax incentive designed to reward owners of energy-efficient commercial buildings. The deduction can provide significant tax savings for qualifying improvements to a building's lighting, HVAC and hot water systems, and building envelope. Property owners who have constructed, renovated, or upgraded commercial, industrial, multifamily, educational, healthcare, or other qualifying facilities may be eligible to claim a deduction based on the energy performance of their building. For many owners, Section 179D has been one of the most valuable incentives available for reducing the cost of energy-efficient investments.

Although the recently enacted H.R. 1 legislation terminates Section 179D for projects that begin construction after June 30, 2026, opportunities still remain. Buildings with qualifying construction that began before the deadline may continue to be eligible for the deduction, even if the project is completed and the deduction is claimed after June 30, 2026. In addition, many property owners may qualify based on past projects and improvements that have not yet been evaluated for 179D eligibility.

EIA helps building owners identify qualifying properties, perform the required engineering analyses, prepare certification documentation, and maximize available tax benefits before these opportunities expire.

How EIA Helps

Eligibility Assessment
EIA evaluates your portfolio to identify properties that may qualify based on construction dates, system improvements, and energy performance -- including past projects that have not yet been assessed for 179D eligibility.
Engineering Analysis & Documentation
Section 179D requires a qualified energy study performed by a licensed engineer. EIA coordinates the required analysis and prepares all IRS-required certification documentation to ensure your claim is fully supported and defensible.
Deduction Maximization & Filing
EIA works directly with your internal tax team or external CPA to ensure the 179D deduction is properly claimed across all eligible building systems -- lighting, HVAC, hot water systems, and building envelope -- and integrated into your overall tax strategy.