Section 179D – Energy Efficient Commercial Buildings Deduction

Section 179D of the Internal Revenue Code provides a permanent federal tax incentive for businesses that invest in energy-efficient commercial and institutional buildings. Administered by the Internal Revenue Service (IRS), this provision allows qualifying taxpayers to claim accelerated deductions for high-performance building systems that reduce energy and power consumption.

Originally enacted as a temporary provision, Section 179D was enhanced and made permanent under recent federal legislation, creating long-term planning certainty for building owners and designers.

AARC helps clients identify, document, and maximize Section 179D deductions through engineering-backed, audit-ready studies.

What Is Section 179D?

Section 179D allows building owners and designers to claim a per-square-foot tax deduction for qualifying energy-efficient improvements, including:

  • Interior lighting systems
  • HVAC and hot water systems
  • Building envelope (walls, roofs, insulation, windows)

The deduction applies to both new construction and retrofit projects.

Available Deduction Amounts

  • Base Deduction: Starting at approximately $0.50 per square foot
  • Enhanced Deduction: Up to $5.00 per square foot (with prevailing wage and apprenticeship compliance)

Because Section 179D is now permanent, these benefits can be incorporated into long-term capital planning and facility upgrade strategies.

Who Can Benefit

Private Sector Buildings:

  • Commercial and industrial property owners
  • Manufacturers, warehouses, data centers, offices, and hospitals
  • REITs, partnerships, and corporations

Government Buildings:
For public-sector projects, the deduction may be allocated to the designer, including architects, engineers, design-build firms, and energy consultants.

AARC's Section 179D Services

AARC provides end-to-end Section 179D solutions, including:

  • Licensed engineering certification
  • Energy modeling and system verification
  • Construction and retrofit validation
  • Audit-ready tax documentation
  • QA/QC compliance reviews
  • Integration with R&D and energy incentive strategies