Energy Efficient Windows Tax Credit

U.S. homeowners replaced 5 million windows in 2025, and 78% of them missed out on a federal tax credit worth up to $600 per year. The Inflation Reduction Act extended energy-efficient window credits through 2032, but most contractors don't mention it during estimates. And most tax preparers don't ask.

What is the energy efficient windows tax credit and how much can you claim?

The Energy Efficient Home Improvement Credit allows homeowners to claim 30% of qualified window costs, capped at $600 annually for windows and skylights combined. This IRA-backed credit runs through December 31, 2032, and applies to windows meeting ENERGY STAR Most Efficient criteria with U-factors ≤0.25 and SHGC ≤0.25 in northern climates.

The credit covers purchase and installation costs for qualifying windows. But the $600 annual cap applies only to windows and skylights as a category—separate from the $1,200 aggregate cap for other home improvements like insulation or doors. So a homeowner installing $3,000 in windows claims $600 (30% of $2,000, the effective cap), not $900.

And the credit applies per tax year, not per property. If you replace windows in January and again in November of the same year, both installations count toward the single $600 annual limit. Filing IRS Form 5695 documents the credit, and you'll need the manufacturer's certification statement showing the window meets ENERGY STAR Most Efficient standards.

This matters because 43% of a home's heating and cooling energy escapes through windows, according to the Department of Energy. Upgrading from single-pane to ENERGY STAR-certified windows cuts energy loss by 25-50% in most climates. So the $600 credit offsets 12-20% of a typical whole-home window replacement project costing $3,000-$5,000.

For more comprehensive savings, check available window replacement rebates in your state—many programs stack with federal credits.

What percentage of your window replacement costs does the tax credit cover?

The credit covers 30% of qualified expenses up to the $600 annual cap. That means the IRS calculates 30% of your total window costs, then applies the $600 ceiling. Or you hit the cap after spending $2,000 on qualifying windows.

But installation labor counts toward the credit base. If windows cost $1,800 and installation runs $700, your total qualified expense is $2,500. The IRS calculates 30% of $2,500 ($750), then caps it at $600. So including labor in the calculation helps you maximize the credit even if you don't reach $2,000 in product costs alone.

And the 30% rate holds through 2032. The Inflation Reduction Act locked in this percentage for a decade, unlike the old 25C credit that fluctuated between 10% and 30% depending on the tax year. (note: the original Section 25C/25D credits expired December 31, 2025; they were replaced by updated credits under the Inflation Reduction Act) After 2032, Congress must reauthorize or the credit expires entirely.

Compare this to other energy upgrades: heat pumps qualify for a separate $2,000 annual credit with no percentage cap, while insulation shares the $1,200 aggregate home improvement cap. Windows fall in the middle tier of incentive generosity. Learn more about stacking options with energy tax credits across categories.

Are there income limits or annual spending caps for this tax credit?

No income limits apply. A household earning $50,000 or $500,000 claims the same $600 maximum credit for qualifying windows. The IRS structured the Energy Efficient Home Improvement Credit as a nonrefundable credit available to all taxpayers who itemize or take the standard deduction.

But the annual spending cap resets every tax year. Install $2,000 in windows in 2026, claim $600. Install another $2,000 in 2027, claim another $600. The cap doesn't carry over or accumulate—it's a per-year limit, not a lifetime limit. So spreading window replacement across two tax years doubles your total credit to $1,200.

And the $600 cap is separate from the $1,200 aggregate cap for other improvements. That $1,200 covers insulation, doors, electrical panel upgrades, and home energy audits combined. Windows and skylights occupy their own $600 bucket. A homeowner can claim $600 for windows plus $1,200 for other upgrades in the same year—$1,800 total federal credit.

"Qualified energy efficiency improvements include exterior windows, exterior doors, and certain roofs that meet or exceed the criteria established by the 2021 International Energy Conservation Code." — IRS Energy Efficient Home Improvement Credit

Use a rebate calculator to estimate combined federal credits and state rebates for your full home energy upgrade.

Which window types and brands qualify for the tax credit?

Windows must meet ENERGY STAR Most Efficient certification—a stricter standard than basic ENERGY STAR. The IRS requires U-factors at or below 0.25 and Solar Heat Gain Coefficients (SHGC) at or below 0.25 for northern and north-central climate zones. Southern zones allow higher SHGC values up to 0.40 since heat gain is less problematic.

Most major manufacturers offer qualifying models: Andersen's 400 Series, Pella's 250 Series, Marvin's Essential line, and Milgard's Quiet Line all include options that meet Most Efficient criteria. But not every window in a product line qualifies—homeowners must verify the specific model's certification before purchase. The manufacturer provides a Certification Statement listing U-factor, SHGC, and ENERGY STAR status.

And skylights qualify under the same $600 annual cap as windows. A homeowner installing $1,500 in windows and $800 in skylights claims 30% of the combined $2,300, capped at $600. The IRS groups these glazing products together, unlike doors which have a separate $250 annual cap within the $1,200 aggregate limit.

Storm windows installed over existing primary windows also qualify if they meet the U-factor and SHGC thresholds. This creates a budget-friendly path for older homes where full window replacement costs $8,000-$15,000. Adding certified storm windows for $2,000-$4,000 delivers similar energy savings at 30-50% of the cost—and still qualifies for the $600 credit.

How do you apply for the energy efficient windows tax credit on your taxes?

File IRS Form 5695 (Residential Energy Credits) with your annual tax return. Part II of the form covers the Energy Efficient Home Improvement Credit. Line 1 captures your window and skylight costs, and the form automatically calculates 30% and applies the $600 cap.

But you don't submit receipts or certification statements with the return. The IRS requires homeowners to retain the manufacturer's Certification Statement and installation invoices for three years in case of an audit. The Certification Statement—typically a one-page PDF available on the manufacturer's website—lists the window model, U-factor, SHGC, and ENERGY STAR Most Efficient status.

And the credit applies in the year you install the windows, not the year you purchase them. Order windows in December 2026 but install them in January 2027, and you claim the credit on your 2027 tax return. Payment date doesn't matter—installation date controls. So if a project spans two tax years, allocate costs based on when each phase was completed.

Contractors sometimes provide a "tax credit package" with the Certification Statement and itemized invoice breaking out materials vs. labor. If your installer doesn't offer this, download the Certification Statement from the manufacturer's website using your window's model number. The National Fenestration Rating Council (NFRC) also maintains a searchable database of certified products at nfrc.org.

For additional savings opportunities, explore heat pump rebates which stack with window credits for whole-home efficiency upgrades.

When does the energy efficient windows tax credit expire and what are the key deadlines?

The credit expires December 31, 2032. Windows installed and paid for by that date qualify, provided the project is complete before midnight on the final day of the tax year. The Inflation Reduction Act funded this 10-year extension when President Biden signed it in August 2022, replacing the expired Section 25C credit.

But the 30% rate and $600 cap hold through the full decade. Earlier versions of the credit fluctuated: 2021 offered 10%, 2022 jumped to 30%, and pre-IRA law would've dropped it to 0% in 2024. Congress eliminated that uncertainty by locking rates through 2032. After 2032, the credit requires reauthorization or it disappears entirely.

And no deadline exists for filing the credit—just for completing the installation. If you install windows in 2026 but forget to claim the credit, you can file an amended return (Form 1040-X) up to three years later. So a 2026 installation can be claimed as late as April 2030 if you file the original 2026 return by the April 2027 deadline. The IRS allows retroactive claims within the standard statute of limitations.

The December 31 cutoff resets annually for the spending cap. Install $2,000 in windows on December 15, 2026, and another $2,000 on January 15, 2027—you claim $600 on your 2026 return and another $600 on your 2027 return. Timing installations around year-end maximizes total credits for multi-phase projects.

Can you stack the windows tax credit with other energy efficiency credits?

Yes. The $600 windows credit stacks with the $1,200 aggregate home improvement credit and the separate $2,000 annual credit for heat pumps, heat pump water heaters, and biomass stoves. A homeowner installing windows ($600 credit), a heat pump ($2,000 credit), and insulation ($400 credit within the $1,200 cap) claims $3,000 in federal credits in a single tax year.

State and utility rebates also stack with federal credits. California's TECH Clean California program offers $3,000-$7,000 for heat pump HVAC systems, and those rebates don't reduce your federal credit eligibility. The IRS treats rebates as a reduction in purchase price only if the rebate comes from the same entity offering the credit—so federal rebates would offset federal credits, but state rebates don't.

And the windows credit stacks with the Residential Clean Energy Credit (25D replacement) for solar panels, solar water heaters, geothermal heat pumps, and wind turbines. That credit offers 30% with no annual cap through 2032. A homeowner installing $20,000 in solar panels and $2,000 in windows claims $6,000 for solar plus $600 for windows—$6,600 total federal credits.

Municipal Property Assessed Clean Energy (PACE) financing programs also work alongside tax credits. PACE loans attach to the property, not the borrower, and repayment happens through property tax bills over 10-25 years. The credit still applies to the full purchase price even if you finance part of it through PACE. So a $5,000 window project financed 50% through PACE still generates a $600 credit based on the $5,000 total cost.

Official Sources

• Energy.gov Save Energy, Save Money — Federal tax credits and rebates for home energy upgrades
• IRS Energy Efficient Home Improvement Credit — Official credit guidelines and filing requirements
• DSIRE USA — State, local, and utility rebate database

Related Reading: Learn more about Energy Audit Myths Debunked and Energy Audit New Construction.

Frequently Asked Questions

Are energy efficient windows eligible for the 2026 tax credit?

Yes. Windows meeting ENERGY STAR Most Efficient criteria qualify for the 30% federal tax credit through December 31, 2032. The window must have a U-factor ≤0.25 and appropriate SHGC for your climate zone. And installation must occur during the 2026 tax year to claim the credit on your 2026 return. The manufacturer provides a Certification Statement confirming eligibility.

How much tax credit can you get for energy efficient windows?

The credit pays 30% of qualified window and skylight costs, capped at $600 per year. So a $3,000 window replacement generates a $600 credit (30% of $2,000, the effective cap). The $600 limit resets annually—install windows in 2026 and 2027, claim $600 each year for $1,200 total. Installation labor counts toward the credit calculation.

What qualifies as an energy efficient window for the tax credit?

Windows must meet ENERGY STAR Most Efficient certification—stricter than basic ENERGY STAR. The IRS requires U-factors ≤0.25 and SHGC ≤0.25 for northern climates. Manufacturers like Andersen, Pella, Marvin, and Milgard offer qualifying models, but not every window in their lineup meets the standard. Verify the specific model's certification before purchase using the manufacturer's Certification Statement.

Do you need to install energy efficient windows yourself to claim the tax credit?

No. The credit covers both product costs and professional installation labor. DIY installation qualifies, but most homeowners hire contractors and still claim the full 30% credit including labor costs. The IRS doesn't require professional installation—it only requires the windows meet ENERGY STAR Most Efficient criteria and installation occurs within the tax year.

What is the deadline to claim the energy efficient windows tax credit?

The credit expires December 31, 2032 for installations. Windows must be installed by that date to qualify. But you can file an amended return to claim a missed credit up to three years after the original return deadline. So a 2026 installation can be claimed as late as April 2030 if you file the original 2026 return on time. The IRS allows retroactive claims within the statute of limitations.

Ready to maximize your energy savings? Use our free rebate calculator to find every federal, state, and utility incentive for your home—windows, insulation, HVAC, and more—in under 60 seconds.

Updated: April 14, 2026 — fact-checked by DuloCore Research. About our editorial process.