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Federal 179D Commercial Buildings Tax Deduction Ending June 2026

DEP Mar 11, 2026
The federal 179D Energy Efficient Commercial Buildings Deduction is set to be terminated for projects that begin construction after June 30, 2026. The deduction has provided tax incentives for energy-efficient improvements to commercial buildings. Building owners and developers planning projects may need to begin construction before the cutoff to remain eligible.
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Source: Montgomery County Energy, “Commercial Energy News March 2026”, received Mar 11, 2026.

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Key dates

2026-06-30
deadline — Last day to begin construction and qualify for 179D deduction

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