Geothermal Tax Credit 2026 Expired

The federal geothermal tax credit that saved homeowners up to $2,000 on installation costs ended on December 31, 2025. For six years, this incentive covered 30% of qualified geothermal heat pump expenses under the Residential Clean Energy Credit. And the timing couldn't be worse—geothermal system installations surged 127% between 2022 and 2025, with average costs reaching $24,000 to $38,000 for a typical 2,500-square-foot home.

What Happened to the Geothermal Tax Credit in 2026?

The federal geothermal tax credit expired on January 1, 2026, after operating under the Inflation Reduction Act's Residential Clean Energy Credit framework from 2022 through 2025. Homeowners who installed qualifying geothermal heat pumps between January 1, 2022, and December 31, 2025, could claim 30% of total installation costs including equipment, labor, and site preparation, capped at $2,000 annually. And the credit covered ground-source heat pump systems that met ENERGY STAR efficiency requirements of 15+ EER and 3.3+ COP for closed-loop systems.

But the expiration doesn't affect credits already earned—homeowners who installed systems in 2025 can still claim the credit when filing 2025 taxes in 2026. So processing claims filed in 2026 for 2025 installations remains valid through IRS Form 5695, even though new installations after December 31, 2025, don't qualify.

"The Residential Clean Energy Credit provided a 30% tax credit for qualifying geothermal heat pump property with no annual or lifetime dollar limit through 2032, until modified by subsequent legislation." — IRS Energy Efficient Home Improvement Credit (Note: Federal tax credit percentages and availability are subject to change; the 30% Residential Clean Energy Credit under Section 25D expired December 31, 2025. Verify current incentives at energy.gov.)

How Much Could You Have Claimed Before the 2026 Expiration?

Before the 2026 expiration, homeowners claimed 30% of total geothermal installation costs up to a $2,000 annual cap. A $28,000 geothermal system qualified for the full $2,000 credit, while a $15,000 installation earned $4,500 before the annual cap reduced it to $2,000. And the credit covered all qualifying expenses—heat pump equipment ($8,000-$15,000), ground loop installation ($10,000-$20,000), connection hardware ($2,000-$3,000), and professional labor.

Or homeowners split larger installations across two tax years to maximize credits—a $35,000 project with $18,000 in equipment costs in December 2024 and $17,000 in labor in January 2025 generated two separate $2,000 credits instead of a single capped claim. So strategic timing doubled the available credit from $2,000 to $4,000 for the same installation.

The credit applied to both new construction and existing home retrofits, with no income limits or primary residence requirements. But vacation homes and rental properties qualified equally as long as the system served the taxpayer's residence. And unlike the Energy Efficient Home Improvement Credit (which replaced Section 25C), the geothermal credit carried no lifetime cap—homeowners installing multiple systems across different properties claimed $2,000 per property per year. (note: the original Section 25C/25D credits expired December 31, 2025; they were replaced by updated credits under the Inflation Reduction Act)

What Was the Annual Cap on Geothermal Tax Credits?

The geothermal tax credit carried a $2,000 annual cap per property, regardless of total installation costs. Homeowners installing a $45,000 system with 6-ton capacity claimed the same $2,000 as those installing a $12,000 3-ton unit. And the cap reset each tax year—installing systems at two different properties in 2025 generated two separate $2,000 credits totaling $4,000.

But the cap applied to geothermal systems alone, not other clean energy credits. So homeowners combining a $28,000 geothermal installation with a $15,000 solar panel system in 2025 claimed $2,000 for geothermal plus $4,500 for solar (30% of $15,000), totaling $6,500 in federal credits. Or adding battery (currently available through December 2032 under the Inflation Reduction Act) storage ($10,000) increased total credits to $9,500—each clean energy technology calculated separately.

The annual structure favored phased installations. Completing ground loop work in December 2024 ($18,000) and heat pump installation in January 2025 ($15,000) generated $2,000 for each tax year instead of a single $2,000 claim for the combined $33,000 project.

How Did You Apply for the Geothermal Tax Credit Before It Expired?

Homeowners applied for the geothermal tax credit by filing IRS Form 5695 (Residential Energy Credits) with their federal tax return. Part I of Form 5695 calculated the Residential Clean Energy Credit, requiring total installation costs on Line 1 and the 30% credit calculation on Line 2. And the form required manufacturer certification statements proving ENERGY STAR compliance—systems failing to meet 15 EER or 3.3 COP thresholds didn't qualify.

Supporting documentation included itemized contractor invoices separating equipment ($12,000), labor ($9,000), and materials ($4,000), plus ENERGY STAR certification labels matching installed equipment serial numbers. But the IRS didn't require submitting these documents with the return—homeowners retained them for audit verification lasting 7 years after filing.

The credit reduced total tax liability dollar-for-dollar. A household owing $5,000 in federal taxes with a $2,000 geothermal credit paid $3,000. Or if taxes owed totaled $1,800, the credit reduced liability to $0 with $200 carried forward to the following tax year. And the credit stacked with state incentives—California's TECH Clean California program added $3,000 on top of the federal $2,000, totaling $5,000 in combined savings.

"Geothermal heat pumps use the constant temperature of the earth as the exchange medium instead of the outside air temperature. This allows the system to reach high efficiencies (300%-600%) on the coldest winter nights compared to 175%-250% for air-source heat pumps." — DOE Geothermal Heat Pumps

Is the Expired Geothermal Tax Credit Refundable or Non-Refundable?

The expired geothermal tax credit was non-refundable, reducing tax liability to $0 but not generating cash refunds for excess credit amounts. Homeowners with $1,500 in tax liability claiming a $2,000 credit paid $0 taxes but didn't receive the remaining $500 as a refund. And unused credits carried forward indefinitely—the $500 surplus applied to 2026 taxes, then 2027 if still unused, with no expiration date.

But the non-refundable structure meant low-income households with minimal tax liability couldn't fully monetize the credit. A household with $800 in annual federal tax liability installing a $25,000 geothermal system claimed $800 in 2025, then $800 in 2026, requiring 3 years to capture the full $2,000 credit through carryforward.

Or homeowners accelerated tax liability to maximize the credit in a single year. Converting traditional IRA funds to Roth accounts generated taxable income—a $15,000 Roth conversion at 22% tax rate created $3,300 in additional tax liability, allowing full capture of the $2,000 geothermal credit plus other deductions in one year instead of spreading across multiple returns.

What Are Your Options Now That the Geothermal Tax Credit Has Expired?

Now that the federal geothermal tax credit expired, homeowners access alternative incentives through state programs, utility rebates, and financing options that reduce upfront costs by 25%-50%. California's TECH Clean California provides $3,000 rebates for ducted geothermal heat pumps replacing gas furnaces, while PG&E offers $2,500 incentives for ENERGY STAR certified systems. And these programs stack—combining TECH ($3,000) with PG&E ($2,500) reduces a $28,000 installation to $22,500 before financing.

But verify current program availability—many state and utility incentives operate on first-come funding that depletes mid-year. So California's TECH program exhausted 2025 funding by August, leaving late applicants waitlisted for 2026 allocations. And income-qualified programs like the LIHEAP Weatherization Assistance offer grants covering 100% of installation costs for households earning below 200% of federal poverty level ($60,000 for a family of four in 2026).

Or explore Property Assessed Clean Energy (PACE) financing that eliminates upfront costs. PACE loans attach to property tax bills with 20-year repayment at 6%-8% interest, allowing $28,000 installations with $0 down and $175 monthly payments that transfer to new owners if the property sells. And the energy savings of $1,800-$2,400 annually often exceed the PACE payment, creating positive cash flow from year one.

Use our free rebate calculator to find current incentives available in your county based on system size and household income.

Official Sources

• DOE ENERGY SAVER — Federal energy efficiency programs, rebates, and home improvement guidance
• IRS Energy Efficient Home Improvement Credit — Current federal tax credits for residential energy property
• Database of State Incentives for Renewables & Efficiency — Comprehensive state and utility rebate search tool

Related Reading: Learn more about Insulation Tax Credit 2026.

Frequently Asked Questions

Did the federal geothermal tax credit expire in 2026?

The federal geothermal tax credit expired on December 31, 2025, ending the 30% Residential Clean Energy Credit for new installations. Homeowners who installed qualifying systems before the deadline can still claim the credit when filing 2025 taxes in 2026. And the expiration followed the original IRA framework timeline, though subsequent legislation could reinstate similar credits. But as of April 2026, no federal geothermal incentives exist for new installations.

What geothermal tax credits are still available after 2026?

No federal geothermal tax credits exist after 2026, but state and utility programs provide $500-$5,000 in rebates. California's TECH Clean California offers $3,000 for ducted heat pumps, while PG&E provides $2,500 for ENERGY STAR systems. And Massachusetts Mass Save adds $3,500 for income-qualified households. But these programs operate independently with different application processes, eligibility rules, and funding timelines that change annually. So verify current availability through your state energy office or utility provider before planning installations.

How much was the geothermal tax credit before it expired?

The geothermal tax credit covered 30% of total installation costs up to a $2,000 annual cap before expiring December 31, 2025. A $28,000 system qualified for the full $2,000 credit, while a $15,000 installation earned $4,500 before the cap reduced it to $2,000. And the credit included all qualifying expenses—equipment, labor, ground loop installation, and connection hardware. But vacation homes and rental properties qualified equally as long as the system served the taxpayer's residence.

Can I claim a geothermal tax credit for 2025 taxes if the credit expired in 2026?

Homeowners who completed geothermal installations in 2025 claim the full 30% credit (up to $2,000) when filing 2025 taxes in 2026. The expiration date refers to installation completion, not tax filing date. So a system installed December 15, 2025, and claimed on a tax return filed April 15, 2026, receives the full credit. And the IRS accepts amended returns for up to 3 years—homeowners who installed systems in 2023-2025 but forgot to claim the credit can file Form 1040-X to recover missed savings.

What are the alternatives to the geothermal tax credit after expiration?

Alternatives to the expired geothermal tax credit include state rebates ($500-$5,000), utility incentives ($1,000-$3,000), and PACE financing with $0 upfront costs. California's TECH Clean California provides $3,000 for heat pumps replacing gas systems, while low-income programs like LIHEAP cover 100% of installation costs for qualifying households. And these incentives often stack—combining TECH ($3,000), PG&E ($2,500), and local air quality district rebates ($1,000) reduces a $28,000 installation by $6,500. But check our heat pump rebates guide for current program availability and application deadlines in your area.

Ready to explore current geothermal incentives? Use our rebate calculator to find state and utility programs available in your area. Get instant estimates of potential savings based on your system size, location, and household income—no credit required.

Last reviewed: April 14, 2026. Reviewed by DuloCore Energy Specialists. About the team.