What is 45L Tax Credit?
- Greg Pacioli

- Feb 12, 2025
- 2 min read
Updated: Oct 1, 2025
The 45L Energy Tax Credit is a federal program aimed at encouraging the construction of energy-efficient homes. It was first introduced through the Energy Policy Act of 2005 and offers builders, developers, and contractors a tax credit of up to $5,000 for each dwelling unit. This applies to newly built or significantly renovated homes that meet certain energy efficiency standards.

Eligibility for the 45L Tax Credit
To qualify for the 45L tax credit, the property must:
✅ Be a residential dwelling
This includes single-family homes, apartments, townhouses, and condominiums.
✅ Meet energy efficiency standards
The property must achieve at least 50% energy savings over the baseline set by the 2006 International Energy Conservation Code (IECC) and be verified by a qualified third-party professional.
✅ Be owned by an eligible taxpayer
The credit is available to builders and developers, not homeowners or property investors who purchase completed properties.
What are the Benefits of the 45L Tax Credit?
Significant Tax Savings – Builders and developers can claim up to $5,000 per qualifying unit for homes constructed after 2023.
Encourages Sustainability – Incentivizes energy-efficient building practices that reduce energy consumption and environmental impact.
Retroactive Claims – In some cases, developers can claim the credit for past projects completed within the eligible timeframe by amending prior tax returns.
45L Tax Credit & Cost Segregation
While the 45L tax credit focuses on energy efficiency, cost segregation helps accelerate depreciation on real estate investments. Combining both strategies can lead to substantial tax savings for developers and property owners:
Cost Segregation identifies shorter-life assets that qualify for accelerated depreciation.
45L provides an immediate tax credit for energy-efficient improvements, reducing taxable income.
Together, they optimize cash flow, allowing property owners to reinvest in future projects.
How to Claim the 45L Tax Credit
Conduct an energy audit – A certified third-party must verify that the property meets efficiency standards.
File IRS Form 8908 – This form is used to claim the 45L tax credit for each qualified home. >>Download Form 8908
Consult with a tax professional – Ensuring compliance and optimizing tax benefits often requires expert guidance.
In Closing
The 45L Energy Tax Credit is a strategic tool that rewards developers and builders for investing in energy efficiency. When combined with cost segregation, the savings can multiply.
If you’re planning to build or renovate, talk with a tax advisor to confirm your eligibility and take full advantage of this credit.
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