§179D Deduction

Section 179D Energy Efficiency Deduction

The §179D deduction is a powerful incentive aimed at improving energy efficiency in commercial buildings. It primarily applies to qualifying energy-efficient systems installed in new construction or major renovations of commercial or government-owned buildings. The Inflation Reduction Act enhanced the 179D deduction by increasing the deduction potential and adding prevailing wage and apprenticeship provisions. Projects meeting these new requirements can max out deductions up to $5.00 per square foot.

The OBBBA has terminated the 179D deduction for all projects that begin construction after June 30, 2026.

⚡ Eligible Building Systems Under §179D

  1. Interior Lighting Systems
    • High-efficiency LED fixtures
    • Occupancy sensors and daylight controls
    • Advanced lighting control panels
  2. HVAC and Hot Water Systems
    • High-performance heating, cooling, and ventilation systems
    • Efficient boilers, chillers, and heat pumps
    • Smart thermostats and building automation systems
  3. Building Envelope Enhancements
    • High-performance insulation
    • Energy-efficient windows and glazing
    • Cool roofing materials
    • Exterior wall systems that reduce thermal transfer

🏛️ Eligible Building Types

    • Commercial office buildings
    • Retail centers
    • Industrial/manufacturing facilities
    • Warehouses
    • Multifamily properties (4+ stories)
    • Government buildings (via designer allocations)

📋 Key Requirements

    • Must meet specific energy reduction targets vs. ASHRAE standards (usually 50% or more depending on the system)
    • Third-party engineering certification is required
    • The building must be placed in service during the applicable tax year
    • For government buildings, the deduction is typically allocated to the designer (architects, engineers, contractors)

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