What type of building?
179D applies to commercial buildings, government buildings, and certain multifamily structures.
Building details
These figures determine your maximum deduction and qualifying systems.
Ownership & deduction rights
179D has special rules for tax-exempt buildings — the deduction can be "allocated" to the designer.
Where should we send the report?
Your personalized 179D eligibility analysis will be generated immediately. We'll also email you a copy.
🔒 No spam. We'll only email your report and important 179D deadline updates.
Your 179D Eligibility Report
Personalized analysis based on your building details
About the 179D Eligibility Generator
This tool uses AI to generate a personalized Section 179D Energy Efficient Commercial Building Deduction eligibility analysis based on your specific building, systems, and project status. Every report is unique to your inputs.
Why this matters now: The One Big Beautiful Budget Act (OBBBA), signed into law in 2025, permanently eliminates Section 179D for projects where construction does not begin before June 30, 2026. There is no phase-down period, no grandfathering, and no extensions. Buildings that qualify could receive up to $5.94 per square foot in federal tax deductions — a potential six-figure benefit for many commercial buildings.
Disclaimer: This report is for informational purposes only and does not constitute tax advice. Consult a qualified tax professional and certified energy modeler before claiming 179D deductions. View full AI disclaimer.