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Section 179D Commercial Energy Deductions
179D is the quiet sibling of cost segregation: a per-square-foot deduction for energy-efficient commercial buildings, worth up to $2.97/sq ft under 2026 inflation adjustments (Rev. Proc. 2025-32). OBBBA closed the window for projects that start construction after June 30, 2026 — which makes 2026 the year to check.
What you get
- ✓Eligibility screen against the June 30, 2026 construction-start cut-off
- ✓Prescriptive vs. modeled pathway comparison ($0.59–$2.97/sq ft 2026 amounts)
- ✓Designer allocation election prep (contractor/owner/designer splitting)
- ✓Form 7205 + §179D(c) certification coordination
- ✓Runs bundled with your cost segregation study where both apply
Who it's for
Commercial builds that broke ground before July 1, 2026 →Designers and contractors holding deduction rightsOwners of newly built offices, retail, warehouse →
Is 179D still alive after OBBBA?
Yes, with a deadline: buildings whose construction begins after June 30, 2026 no longer qualify. Deduction amounts for 2026 are $0.59/sq ft (prescriptive, $1.19 cap) up to $2.97/sq ft (modeled, $5.94 cap) per Rev. Proc. 2025-32.
Can I stack 179D with cost segregation?
Different assets, different forms — yes, many owners use both on the same building. We coordinate so basis tracking stays clean.
Compare tiers before you commit
Rapid vs. Quick™ vs. Full Engineered — side by side, with honest recommendations for your property type.