Among the many tax law changes stemming from the One Big Beautiful Bill Act (OBBBA) is an overhaul of existing clean energy tax incentives. Some incentives have already expired as of December 2025, while others are set to terminate in 2026. Below is a timeline of expiring federal clean energy tax incentives under the OBBBA, including some key dates contractors should keep in mind.
Credits That Have Already Expired
The following clean energy credits expired within the last year:
- Section 25E Previously-owned Clean Vehicles Credit and Section 30D New Clean Vehicle Credit—expired after September 30, 2025
Two credits related to the purchase of clean vehicles, the Previously-owned Clean Vehicles Credit and the New Clean Vehicle Credit, expired for vehicles acquired after September 30, 2025.
- Section 25D Residential Clean Energy Credit—expired after December 31, 2025
The Residential Clean Energy Credit is a 30% credit that applies to the purchase of new, qualified clean energy property for a primary or secondary residence. Property had to be fully installed and placed in service by December 31, 2025, in order to qualify for the credit.
- Section 25C Energy Efficient Home Improvement Credit—expired after December 31, 2025
The Energy Efficient Home Improvement Credit is a 30% credit (up to $3,200 a year) that applies to qualified energy-efficient improvements to a primary residence. Property had to be placed in service by December 31, 2025, to qualify for the credit.
Incentives Expiring in 2026 and 2027
The following federal incentives are set to terminate in 2026 or 2027:
- Section 179D Energy Efficient Commercial Buildings Deduction—expires for projects with construction beginning after June 30, 2026
The Energy Efficient Commercial Buildings Deduction is a tax deduction available to qualifying building owners who place in service energy-efficient commercial building property (EECBP) or energy-efficient commercial building retrofit property (EEBRP). Projects subject to the 179D deduction have to begin construction before June 30, 2026, in order to still be eligible for the deduction.
- Section 30C Alternative Fuel Vehicle Refueling Property Credit—expires after June 30, 2026
The Alternative Fuel Vehicle Refueling Property Credit is a tax credit available to businesses and individuals who install qualified refueling or recharging property, including electric vehicle charging equipment, in a qualifying location. This credit expires for property placed in service after June 30, 2026.
- Section 45L New Energy Efficient Home Credit—expires for homes acquired after June 30, 2026
The New Energy Efficient Home Credit is a tax credit available to eligible contractors who build or substantially reconstruct qualified new energy-efficient homes. The amount of the credit depends on the type of home, its energy efficiency, and the date the home is acquired. Eligible contractors may be able to claim up to $5,000 per home. This credit will not be allowed for any new energy-efficient home acquired after June 30, 2026.
- Section 48E Clean Electricity Investment Tax Credit and Section 45Y Clean Electricity Production Tax Credit for solar and wind projects—expire for facilities placed in service after December 31, 2027
Phase-outs for two major federal tax incentives for renewable energy have been accelerated under the OBBBA. The Clean Electricity Investment Credit (ITC) and the Clean Electricity Production Credit (PTC) for the construction of applicable wind and solar facilities are set to terminate after 2027.
The deadlines for eligibility for these credits are as follows:
- For solar and wind projects starting before July 4, 2026: the contractor has (the standard) up to four years to complete the project and claim the ITC and PTC.
- For solar and wind projects starting after July 4, 2026: the project must be completed by December 31, 2027, in order to be eligible for the ITC and PTC.
The IRS has released guidance regarding the “beginning of construction” for the purpose of enforcing the ITC and PTC credit termination date for solar and wind facilities.
Looking Forward
2026 and 2027 will be critical for capitalizing on these federal tax incentives while they are still available. Consider meeting with your RBT accountant soon to discuss the possibility of claiming clean energy tax credits and deductions before they expire. Contact RBT CPAs today to find out how we can be Remarkably Better Together.










