The federal 25C energy tax credit for windows expired on December 31, 2025. It no longer applies to window replacements in 2026.
The federal 25C energy tax credit for windows expired on December 31, 2025. It no longer applies to window replacements in 2026.
2025 filers can still claim 30% of their window costs, up to a $600 cap, on their 2025 tax return. Windows must have been installed by December 31, 2025, to qualify. Even without the credit, replacing old windows still delivers strong long-term value.
What Homeowners Need to Know About the 2025 Tax Credit
- Credit deadline passed: The 25C tax credit expired at the end of 2025. It does not apply to any windows installed in 2026 or later.
- 2025 filers still qualify: If your windows were installed by December 31, 2025, you can still claim 30% of costs. The maximum credit is $600 on your 2025 return.
- QMID required to file: To claim the credit, you’ll need a Qualified Manufacturer ID Number. Your contractor provides this. Coastal Windows & Exteriors can supply it upon request.
- Use IRS Form 5695: File your residential energy credit using Form 5695. Consulting a tax professional is strongly recommended for accuracy.
- Savings continue without the credit: Upgrading from single to triple pane windows saves over $500 per year on energy bills. That payback continues regardless of tax incentives.
- Energy efficiency still matters: ENERGY STAR certified windows with 0.1 CFM draft ratings deliver year-round comfort. Your savings compound over a 25+ year window lifespan.
Making a Smart Investment Without the Tax Credit
| Scenario | Tax Credit Available? | Energy Savings | Best Next Step |
| Installed by 12/31/2025 | Yes — claim on 2025 return | $500+/year | File IRS Form 5695 |
| Installing in 2026 | No — credit has expired | $500+/year | Focus on energy ROI |
| Upgrading from single pane | Not applicable in 2026 | Highest savings tier | Request a free estimate |
Tax Credit Expired: How to Still Save Money with Replacement Windows
Top Recommendation: Triple pane windows for maximum long-term energy savings. They deliver over $500/year in savings regardless of credit status. Ask us about financing for up to 20 years on your new exterior upgrade!
Best for 2025 Filers: Act now on your tax return. Gather your QMID from your contractor and file Form 5695 with your 2025 return before the deadline.
Best for 2026 Buyers: Focus on the energy ROI. Triple pane windows pay for themselves over time through lower heating and cooling costs.
Request a free window estimate from Coastal Windows & Exteriors.
Browse our complete window FAQ guide from Coastal Windows & Exteriors.
Explore our Windows Exterior Remodeling Home Improvement Help Center.
Last Updated: April 2026
Sources:
- Upgrading from single- to triple-pane windows can reduce energy costs by more than $500 annually. ENERGY STAR Residential Windows, Doors & Skylights ENERGY STAR’s product guidance on energy savings from certified windows, doors, and skylights. (Accessed April 2026)
- The most energy-efficient windows carry ENERGY STAR certification and meet a 0.1 CFM air leakage standard. China North Glass Soundproofing Benefits of Double vs Triple Pane Insulating Glass Overview of performance ratings and efficiency standards for double and triple pane window glazing. (2025)
- Switching to ENERGY STAR certified windows, doors, and skylights can cut heating and cooling costs by an average of up to 13% compared to non-certified products. ENERGY STAR Residential Windows, Doors & Skylights ENERGY STAR’s official resource on the energy-saving benefits of certified windows, doors, and skylights. (Accessed April 2026)
- When a homebuilder upgrades from double- to triple-pane windows, the energy efficiency performance of those windows can improve by 40% or more. Pacific Northwest National Laboratory How Triple-Pane Windows Stop Energy and Money Flying Out the Window PNNL research on the energy performance gains from upgrading to triple-pane window technology. (2025)
