Is There a Window Tax Credit in 2026? What Changed (and What Still Helps)
Written by the LehighValleyWindows.com editorial team ·
Straight answer, because most articles online are out of date: the federal energy tax credit for replacement windows is gone for projects installed in 2026. Congress terminated it effective December 31, 2025. Here’s exactly what changed, the one group who can still claim money, and the real ways to save on a window project now.
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What changed: the 25C credit ended December 31, 2025
The Energy Efficient Home Improvement Credit (Internal Revenue Code Section 25C) — the one worth up to $600 per year for qualifying exterior windows and skylights — was terminated by the tax law passed in July 2025 (Public Law 119-21). Per the IRS: the credit is not allowed for any property placed in service after December 31, 2025.
“Placed in service” means installed and ready for use — not ordered, not paid for, not sitting in the garage. There is no binding-contract exception for windows. If your windows went in on or after January 1, 2026, there is no federal credit to claim, no matter when you signed.
Who can still claim money
If your qualifying ENERGY STAR windows were installed by December 31, 2025 and you didn’t claim the credit, you’re not out of luck: the credit is claimed on your tax return for the year of installation (Form 5695), and amended returns are generally allowed within three years. Dig out the manufacturer certification and your itemized invoice, and talk to your tax preparer.
Projects that straddled the deadline count window by window — only units actually installed by December 31, 2025 qualify.
What still lowers the cost of a 2026 window project
Utility rebates: Pennsylvania utilities run efficiency programs that change year to year — check your electric utility’s current offerings before you buy.
Manufacturer and dealer promotions: with the federal credit gone, brands lean harder on seasonal discounts and financing promotions — they’re negotiable, especially with a competing quote in hand.
Right-sizing the project: a careful assessment often finds that only some windows need replacement now. And energy savings themselves haven’t gone anywhere: tight, Low-E replacement windows keep cutting heating bills every Pennsylvania winter, credit or no credit.
Don’t let a sales pitch invent a deadline
Expect to hear urgency built around tax season anyway. If a salesperson implies a federal window credit exists for 2026 installations, that’s your cue about how the rest of the pitch is calibrated.
The honest math for 2026 is simpler: the best price comes from an itemized quote from a vetted local contractor, compared fairly against any competing offer. Our free matching service will set that up — one local pro, one written quote, no pressure and no imaginary deadlines.
FAQ
Can I still get the $600 window tax credit in 2026?
Not for windows installed in 2026 or later — Section 25C was terminated for property placed in service after December 31, 2025. Only installations completed by that date qualify, claimed on that year’s return or an amended return within the normal three-year window.
I signed my contract in 2025 but installation happened in 2026. Do I qualify?
No. Eligibility follows the placed-in-service date, and the IRS provided no binding-contract relief for 25C. Contract and payment dates don’t matter for this credit.
Are there Pennsylvania state tax credits for windows?
Pennsylvania has no broad state income tax credit for window replacement. Utility efficiency programs and periodic local initiatives are the avenues worth checking — ask your electric utility what’s currently offered.
Do energy-efficient windows still pay off without the credit?
Yes — the credit was a one-time bonus, but the bill savings recur every year. Replacing leaky single-pane windows with tight Low-E units meaningfully cuts heating costs in our climate, and comfort improves immediately.
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