Update (2026): The federal Energy Efficient Home Improvement Credit (Section 25C) expired December 31, 2025, following the passage of the OBBBA. Check state and local programs for current incentives.
Up to 30% of a home's heating and cooling energy is lost through inefficient windows and doors. So homeowners are literally throwing money out the window every month. This ongoing energy loss directly impacts utility bills, costing the average household hundreds of dollars each year. And with energy costs rising, stopping this thermal leakage becomes a top financial priority for anyone looking to reduce expenses.
What is the 2026 Energy Efficient Window Tax Credit and How Much Can You Save?
The federal Energy Efficient Home Improvement Credit (Section 25C) ended for property placed in service after December 31, 2025 (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. So homeowners can claim up to a $600 annual credit for windows specifically, as part of a larger $3,200 total annual limit for all energy efficiency upgrades through December 31, 2025.
So why does this matter? The core issue is that old, single-pane windows are a primary source of energy waste in millions of American homes. But replacing them often involves an upfront cost of $3,000 to $10,000. This tax credit directly reduces that financial barrier, making a project with a 10-15 year payback period more accessible. And the credit is nonrefundable, meaning it can reduce your tax liability to zero, but you won’t get a refund for any amount that exceeds your tax bill. This incentive makes the financial calculation for upgrading your home's thermal envelope much more favorable. The IRS specifies this credit is for improvements made to your principal residence. Find more details on all available energy tax credits.
Which Windows and Homeowners Qualify for the 2026 Tax Credit?
Qualifying homeowners must own their primary residence in the U.S., and the property must be an existing home, not new construction. So the installed windows must meet specific ENERGY STAR Most Efficient certification requirements to be eligible for the 2026 tax credit.
To qualify, the windows must be installed in your main home located in the United States. And they must meet the stringent performance criteria set by the ENERGY STAR program. This typically means having a U-factor and Solar Heat Gain Coefficient (SHGC) at or below the levels specified for your climate zone. So you must keep the Manufacturer's Certification Statement for your records, as it proves the product qualifies. But you don't submit it with your tax return.
"The windows and skylights must meet ENERGY STAR Most Efficient certification requirements." — ENERGY.GOV
This ensures that only high-performance products that deliver real energy savings are subsidized. So homeowners should verify a product's eligibility before purchase by checking for the ENERGY STAR label and reviewing the certification. You can explore more about window replacement rebates available in your area.
How Do You Claim the 2026 Window Tax Credit and What Are the Key Deadlines?
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). So the key deadline is that the windows must be installed and placed in service by December 31, 2026.
The process is straightforward. First, purchase and install qualifying windows between January 1, 2026, and December 31, 2026. And you must save all your receipts and the Manufacturer’s Certification Statement. 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 form calculates your total credit based on the cost of the windows, excluding installation labor for this specific upgrade. But remember, the credit for windows is capped at $600 for the year.
Can You Combine the 2026 Window Tax Credit with Other Energy Efficiency Incentives?
But the credit calculation basis is reduced by any non-taxable utility rebates received, which affects the final credit amount.
Combining incentives is a powerful strategy to lower project costs by 50% or more. For example, your state or local utility may offer a cash rebate of $50 per window. And you can claim that rebate in addition to the federal tax credit. But the IRS requires you to subtract the utility rebate amount from your total project cost before calculating your 30% federal credit (this federal credit ended for property placed in service after December 31, 2025). So if your windows cost $3,000 and you receive a $500 utility rebate, you calculate the 30% federal credit on the remaining $2,500. This rule prevents "double-dipping" on the same dollar of expense. This is similar to how credits work for other upgrades like heat pump rebates.
Incentive Comparison: Federal vs. State vs. Utility
| Incentive Name | Type | Max Amount | Key Eligibility |
|---|---|---|---|
| Energy Efficient Home Improvement Credit | Federal Tax Credit | $600 (for windows) | Primary residence, ENERGY STAR certified |
| State Clean Energy Rebate (Example) | State Rebate | $1,000 | State resident, income limits may apply |
| Utility Window Rebate (Example) | Utility Rebate | $50 per window | Must be a customer of the specific utility |
Related Reading: Learn more about Energy Efficient Garage Door and Energy Efficient Windows Audit.
Frequently Asked Questions
What are the eligibility requirements for the energy efficient window tax credit in 2026?
To be eligible, you must be a homeowner installing qualifying windows in your primary U.S. residence. The home must be existing, not new construction. So the windows themselves must meet the ENERGY STAR Most Efficient certification requirements for your specific climate zone.
How much is the maximum energy efficient window tax credit for 2026?
The federal Energy Efficient Home Improvement Credit (Section 25C) ended for property placed in service after December 31, 2025 (IRS FS-2025-05).
What is the process for claiming the 2026 energy efficient window tax credit?
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). And you must retain your purchase receipts and the Manufacturer's Certification Statement for your records but don't need to submit them with your return.
What is the deadline to install windows to qualify for the 2026 tax credit?
The windows must be purchased and placed in service (installed) between January 1, 2026, and December 31, 2026, to qualify for the 2026 tax credit.
Are there specific types of windows that qualify for the 2026 energy efficient tax credit?
Yes, only windows that meet the ENERGY STAR Most Efficient performance standards qualify. These standards specify maximum U-factor and Solar Heat Gain Coefficient (SHGC) ratings, which vary by climate zone. So you must check the product's ENERGY STAR label to confirm eligibility.
Ready to see how much you can save on your home improvement projects? Calculate Your Rebates
Last reviewed: April 14, 2026. Reviewed by DuloCore Energy Specialists. About the team.
Check your California insulation rebate eligibility — see the programs you qualify for and the dollar amounts on our California insulation rebate finder.