Homeowners with geothermal heat pumps can cut their energy bills by up to 65% compared to traditional HVAC systems. And now, a federal incentive makes that initial investment far more accessible. This isn't a small rebate. It’s a direct, dollar-for-dollar reduction of your federal tax liability, fundamentally changing the financial equation for adopting this clean energy technology. The window to claim the full amount is open right now, but it won't last forever.
What is the Geothermal Tax Credit and What Percentage Can You Claim?
The federal Residential Clean Energy Credit (Section 25D) ended for expenditures made after December 31, 2025, and the IRS treats an expenditure as made when installation is completed (IRS FS-2025-05). Federal tax credits for this work have ended, but state, local and utility rebates may still apply; check what is available at your address with the DuloCore rebate calculator.
The geothermal tax credit is officially known as the Residential Clean Energy Credit under section 25D (now expired, replaced by the Residential Clean Energy Credit) of the U.S. tax code. The federal Residential Clean Energy Credit (Section 25D) ended for expenditures made after December 31, 2025, and the IRS treats an expenditure as made when installation is completed (IRS FS-2025-05). This isn't a deduction. It's a nonrefundable tax credit, which means it can lower your tax bill to zero, but you won't get any of it back as a refund beyond your tax liability. For a typical system costing $25,000, this translates to a $7,500 credit. The credit percentage is scheduled to decrease to 26% for systems installed in 2033 and 22% in 2034 before expiring. Find all available incentives using our rebate calculator.
So what? Why does this matter? A geothermal heat pump system is a significant upfront investment, with average installation costs ranging from $15,000 to $35,000. But without a financial incentive like the 30% tax credit (this federal credit ended for expenditures made after December 31, 2025), this high-efficiency technology remains out of reach for millions of American households. This credit directly addresses that barrier, reducing the net cost by thousands of dollars and shortening the payback period from over 10 years to as few as 5-7 years in many cases.
What Geothermal Equipment Qualifies and Are There Income Limits?
The federal Residential Clean Energy Credit (Section 25D) ended for expenditures made after December 31, 2025, and the IRS treats an expenditure as made when installation is completed (IRS FS-2025-05). This federal incentive has no income limits, making it available to all homeowners regardless of their adjusted gross income (AGI).
To qualify for the 30% credit, the entire geothermal system must meet the specific criteria set by the ENERGY STAR program. The total cost used to calculate the credit includes more than just the heat pump unit itself. It covers the costs of the heat pump, ground loop or heat exchanger, associated piping, wiring, and all labor for onsite preparation, assembly, and original installation. According to the U.S. Department of Energy, this comprehensive coverage ensures the full scope of the project contributes to the credit amount. Crucially, there are no income caps on this specific credit, distinguishing it from many other energy tax credits that have income-based phaseouts. This makes it a universally accessible incentive for homeowners looking to invest in geothermal technology.
Are There Any Annual or Equipment Spending Caps on the Credit?
The federal Residential Clean Energy Credit (Section 25D) ended for expenditures made after December 31, 2025, and the IRS treats an expenditure as made when installation is completed (IRS FS-2025-05).
This is a key feature that separates the geothermal tax credit from other home energy incentives. The federal Energy Efficient Home Improvement Credit (Section 25C) ended for property placed in service after December 31, 2025 (IRS FS-2025-05). The federal Residential Clean Energy Credit (Section 25D) ended for expenditures made after December 31, 2025, and the IRS treats an expenditure as made when installation is completed (IRS FS-2025-05). This uncapped structure provides a powerful incentive for homeowners to invest in the most efficient and appropriately sized system for their property without worrying about hitting a financial ceiling. The IRS confirms this structure directly on its credit guidance pages.
All of these qualified expenses have no credit limits except for fuel cell property.
--- IRS.gov, Residential Clean Energy Credit
How Do You Claim the Geothermal Tax Credit and What Are the Key Dates?
Form 5695 only covers qualifying work completed by December 31, 2025 and claimed on a 2025 return; the federal 25C and 25D credits ended after that date (IRS FS-2025-05). The federal Residential Clean Energy Credit (Section 25D) ended for expenditures made after December 31, 2025, and the IRS treats an expenditure as made when installation is completed (IRS FS-2025-05).
The process for claiming the credit is straightforward. First, you must purchase and install a qualifying geothermal system. Be sure to keep all receipts and documentation, including proof that the system is ENERGY STAR certified. Form 5695 only covers qualifying work completed by December 31, 2025 and claimed on a 2025 return; the federal 25C and 25D credits ended after that date (IRS FS-2025-05). The total calculated credit from this form then transfers directly to your Form 1040, reducing your total tax liability. The "placed in service" date is critical; it's the date the installation is complete and the system is ready for use. The federal Residential Clean Energy Credit (Section 25D) ended for expenditures made after December 31, 2025, and the IRS treats an expenditure as made when installation is completed (IRS FS-2025-05). (See also: best geothermal heat pump brands.)
Can You Stack the Geothermal Tax Credit with Other Energy Incentives? (See also: geothermal tax credit vs solar tax credit.)
However, a utility rebate for the equipment itself typically reduces the cost basis used to calculate the 30% federal credit (this federal credit ended for expenditures made after December 31, 2025), while state credits do not.
Stacking incentives is a powerful strategy, but the rules matter. State tax credits are generally considered a separate benefit and don't reduce the amount you can claim on your federal return. But rebates from a utility company are often viewed by the IRS as a discount or reduction in price. For example, a $30,000 geothermal project that receives a $2,000 rebate from the local utility has a new cost basis of $28,000. The 30% federal credit (this federal credit ended for expenditures made after December 31, 2025) would then be calculated on this lower amount, resulting in an $8,400 credit ($28,000 x 0.30). So, while you can combine them, the federal portion is calculated after the utility rebate is subtracted. Check for available heat pump rebates in your area to see how they interact.
Federal vs. State Energy Incentive Comparison
| Incentive Name | Credit/Rebate Amount | Annual Cap | Expiration |
|---|---|---|---|
| Residential Clean Energy Credit (Federal) | Ended Dec 31, 2025 | — | Ended Dec 31, 2025 |
| Energy Efficient Home Improvement Credit (Federal) | Ended Dec 31, 2025 | Ended Dec 31, 2025 | Ended Dec 31, 2025 |
| NYS Clean Heat Rebate (State Example) | Varies by utility, up to $15,000 | Per project | Varies by utility |
Related Reading: Learn more about Geothermal Carryforward Tax Credit Rules and Geothermal Tax Credit For New Construction.
Related Reading: Learn more about Geothermal Tax Credit History Timeline.
Frequently Asked Questions
What are the eligibility requirements for the federal geothermal tax credit? (See also: geothermal heat pump cost with rebates.)
To be eligible, the geothermal heat pump must be ENERGY STAR certified and installed at your primary or secondary residence in the United States. The credit is available for both existing homes and new construction.
How much is the federal tax credit for installing a geothermal heat pump?
The federal Residential Clean Energy Credit (Section 25D) ended for expenditures made after December 31, 2025, and the IRS treats an expenditure as made when installation is completed (IRS FS-2025-05).
How do I claim the geothermal energy tax credit on my federal tax return?
Form 5695 only covers qualifying work completed by December 31, 2025 and claimed on a 2025 return; the federal 25C and 25D credits ended after that date (IRS FS-2025-05). You must have receipts proving the cost and ENERGY STAR certification of the equipment.
When does the federal geothermal tax credit expire?
The federal Residential Clean Energy Credit (Section 25D) ended for expenditures made after December 31, 2025, and the IRS treats an expenditure as made when installation is completed (IRS FS-2025-05). It then steps down to 26% for systems installed in 2033 and 22% in 2034. The credit is set to expire completely after December 31, 2034.
Does the geothermal tax credit apply to both new construction and existing homes?
The federal Residential Clean Energy Credit (Section 25D) ended for expenditures made after December 31, 2025, and the IRS treats an expenditure as made when installation is completed (IRS FS-2025-05).
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Official Sources
Updated: April 14, 2026 — fact-checked by DuloCore Research. About our editorial process.
Check your California heat pump rebate eligibility — see the programs you qualify for and the dollar amounts on our California heat pump rebate finder.