Federal energy tax credits are not refundable. They can reduce your federal income tax to zero, but any credit left over after that disappears; the IRS will not send you a check for the unused portion. The one meaningful exception is not really an exception to the rule but a way around it: for clean vehicle purchases, you could transfer the credit to the dealer at the point of sale and receive the full amount as a price cut regardless of what you owed in tax.1Internal Revenue Service. FAQs for Modification of Sections 25C, 25D, 25E, 30C, 30D, 45L, 45W, and 179D Under Public Law 119-21
What Nonrefundable Means for the Money You Get Back
All federal energy credits sit in Subpart A of the Internal Revenue Code, the section that groups “nonrefundable personal credits.” Under Section 26, the total of those credits in a given year cannot exceed your regular tax liability for that year.2Office of the Law Revision Counsel. 26 U.S. Code 26 – Limitation Based on Tax Liability The credit works against the tax you owe. Once your tax hits zero, the credit stops.
A worked example makes the difference clear. Suppose you owe $3,000 in federal income tax and qualify for a $7,500 clean vehicle credit that you claim on your return. The credit erases the $3,000 you owed. The remaining $4,500 does not carry over to your refund. It is gone. A refundable credit, like the earned income credit, would pay that $4,500 out to you; the energy credits were never written that way.
This matters most for people whose tax bill is modest. A retiree, a part-time worker, or anyone whose withholding and liability run low can qualify for the full credit on paper and still see only a fraction of it in practice, because there is not enough tax there for the credit to erase.
The Dealer Transfer: The Only Way to Get the Full Credit Without Owing Tax
For the new clean vehicle credit under Section 30D and the used clean vehicle credit under Section 25E, buyers had a second option. Instead of waiting to claim the credit on a tax return, you could transfer it to a registered dealer at the time of purchase. The dealer then reduced the price of the vehicle by the credit amount, functioning as an instant discount or down payment.3Internal Revenue Service. Topic H – Frequently Asked Questions About Transfer of New Clean Vehicle Credit and Previously Owned Clean Vehicles Credit
Here is the key point for someone worried about the nonrefundable limit: the full allowable credit could be transferred to the dealer even if the credit amount exceeded the buyer’s tax liability.4Internal Revenue Service. Topic A – Frequently Asked Questions About the Eligibility Rules for the New Clean Vehicle Credit Under Section 30D A buyer with $2,000 in tax owed could still take the full $7,500 off the vehicle price at the dealership. That is the single meaningful workaround to the nonrefundable structure in the entire energy-credit system.
The transfer carried one risk. If, when you file your return, it turns out you did not actually qualify for the credit (for instance, your income was over the limit), you must repay the transferred amount to the IRS.5Internal Revenue Service. Instructions for Form 8936 The dealer also had to be registered with the IRS Energy Credits Online portal for the transfer to count.6Internal Revenue Service. Topic I – Frequently Asked Questions About Registering a Dealer/Seller for Seller Reporting and Clean Vehicle Tax Credit Transfers The residential energy credits had no equivalent transfer mechanism.
Solar and Other Section 25D Property: Unused Credit Carries Forward
The Residential Clean Energy Credit under Section 25D is still nonrefundable, but it behaves differently from the other energy credits in one important way: any credit that exceeds your tax liability in the year of installation carries forward to the next year, and keeps rolling forward until it is fully used.7Office of the Law Revision Counsel. 26 USC 25D – Residential Clean Energy Credit
Section 25D covers 30% of the cost of solar electric systems, solar water heaters, small wind turbines, geothermal heat pumps, fuel cells, and battery storage. If you installed solar in 2024 or 2025 and your tax liability was not high enough to absorb the credit, the leftover amount rolls into the following tax year, then the next, until it is exhausted.8Internal Revenue Service. Instructions for Form 5695 You still do not receive the difference as a cash refund in any given year, but the credit is not lost the way it would be under a straight nonrefundable rule with no carryforward.
The credit’s termination for new expenditures after December 31, 2025 does not wipe out carryforward amounts already earned. If you installed a qualifying system before the cutoff, the balance you carry into 2026 and later years remains available against those years’ tax bills.1Internal Revenue Service. FAQs for Modification of Sections 25C, 25D, 25E, 30C, 30D, 45L, 45W, and 179D Under Public Law 119-21
The Other Credits: Unused Amounts Are Gone
The rest of the consumer energy credits do not carry forward for personal use.
The Energy Efficient Home Improvement Credit under Section 25C, which covers 30% of the cost of items like efficient windows, doors, insulation, heat pumps, and home energy audits, is strictly nonrefundable with no carryforward. If the credit for a given year exceeds your tax liability, the excess is permanently lost.9Office of the Law Revision Counsel. 26 U.S. Code 25C – Energy Efficient Home Improvement Credit The annual caps do reset each year, so spreading improvements across tax years is one way homeowners kept the credit within their liability.
The clean vehicle credits, when claimed directly on your tax return rather than transferred to the dealer, work the same way. There is no carryforward for personal-use vehicles, and any amount above your tax liability is forfeited.4Internal Revenue Service. Topic A – Frequently Asked Questions About the Eligibility Rules for the New Clean Vehicle Credit Under Section 30D The used clean vehicle credit follows the same rule.10Internal Revenue Service. Used Clean Vehicle Credit That is why the dealer transfer was so consequential for buyers with low tax bills: the transfer was the only route to receiving the full value.
Where the Credits Stand After the 2025 Law Change
The One Big Beautiful Bill, signed on July 4, 2025, pulled forward the end dates for every major consumer energy credit. The vehicle credits under Sections 30D, 25E, and 45W are not available for vehicles acquired after September 30, 2025. The residential credits under Sections 25D and 25C are not available for expenditures or property placed in service after December 31, 2025.1Internal Revenue Service. FAQs for Modification of Sections 25C, 25D, 25E, 30C, 30D, 45L, 45W, and 179D Under Public Law 119-21
The refundability rules did not change with the law. A qualifying purchase made before the applicable cutoff still generates a nonrefundable credit on the 2025 return, still subject to the same tax-liability limit, and still eligible for whatever carryforward or transfer treatment applied to that particular credit. A vehicle placed in service after September 30, 2025 can still qualify if you entered into a binding written contract and made a payment on or before that date.11Internal Revenue Service. Clean Vehicle Tax Credits After the cutoffs, no new credit is generated, but Section 25D carryforward balances earned from earlier installations continue to work against future years’ tax.