179D Guide · 8 min read
Section 179D Tax Deduction Calculator: How to Calculate Your Commercial Building's Deduction in 2026
The Section 179D tax deduction can be worth $0.59 to $5.94 per square foot for energy-efficient commercial buildings in 2026. Learn how the calculator works, what rates apply to your state and building type, and how to maximize your deduction before the June 2026 deadline.
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