Claim Energy Efficient Windows Deduction – If you’re a U.S. homeowner who installed energy-efficient windows in 2025 (or earlier in the eligible period), you may still qualify to claim significant tax savings on your 2025 federal tax return. While commonly referred to as the “energy efficient windows deduction,” this benefit is technically the Energy Efficient Home Improvement Credit (Section 25C). It provides a nonrefundable tax credit of up to $600 for qualifying exterior windows and skylights.
The credit expired for any windows installed after December 31, 2025, so this guide focuses on what you need to know right now in 2026 to successfully claim it.
What Is the Energy Efficient Home Improvement Credit for Windows?
The Energy Efficient Home Improvement Credit, often called the 25C credit, rewards homeowners for making energy-saving upgrades to their primary residence. For exterior windows and skylights installed between January 1, 2023, and December 31, 2025, the credit equals 30% of your qualified costs, capped at $600 per year for all windows and skylights combined.
This is part of a larger annual limit of $1,200 for building envelope improvements (windows, doors, insulation, etc.). You can claim the maximum credit each eligible year through 2025—no lifetime cap applies.
Important note: Labor costs for installation do not qualify. Only the cost of the qualifying windows or skylights themselves counts.
Who Qualifies to Claim the Energy Efficient Windows Credit?
To be eligible, you must meet these IRS requirements:
- The home must be your primary residence (where you live most of the time) located in the United States. Second homes, rental properties, or vacation homes do not qualify.
- The windows or skylights must be installed in an existing home (not new construction).
- You must own and occupy the home as your principal residence.
- The improvements must be placed in service (fully installed and ready for use) by December 31, 2025.
Business-use portions of your home may qualify on a prorated basis if business use is 20% or less.
What Windows Qualify for the Tax Credit?
Not every energy-efficient window qualifies. To meet IRS standards:
- Windows and skylights must be new (never used before) and have an expected lifespan of at least 5 years.
- They must meet the ENERGY STAR Most Efficient certification requirements specific to your climate zone.
- For installations in 2025, the windows must come from a qualified manufacturer registered with the IRS. You will need to report the manufacturer’s 4-character Qualified Manufacturer Identification Number (QMID) on your tax return.
Pro tip: Ask your window manufacturer or retailer for the QMID and a manufacturer’s certification statement before filing. ENERGY STAR provides a searchable directory to verify eligible products by climate zone and Certified Product Directory (CPD) number.
How Much Can You Actually Claim?
- Credit rate: 30% of the product cost (excluding labor and installation).
- Maximum for windows/skylights: $600 per tax year (combined limit).
- Overall envelope limit: $1,200 per year when combined with doors, insulation, etc.
Example: If you spent $2,500 on qualifying ENERGY STAR Most Efficient windows in 2025, you could claim 30% ($750)—but the cap limits it to $600.
You may combine this with other 25C credits (e.g., up to $500 for doors or $1,200 total for envelope items) in the same year.
Step-by-Step Guide: How to Claim the Energy Efficient Windows Deduction on Your Taxes?
Follow these official IRS steps to claim your credit safely:
- Confirm eligibility and gather proof — Verify your windows meet ENERGY STAR Most Efficient standards and obtain the QMID (for 2025 installs).
- Keep detailed records — Save all receipts, installation invoices, ENERGY STAR/NFRC labels, and the manufacturer’s certification. You don’t submit these with your return, but you’ll need them if audited.
- Complete IRS Form 5695 — Fill out Part II of Form 5695 (Residential Energy Credits) for the year the windows were placed in service.
- File with your federal tax return — Submit Form 5695 along with your Form 1040. E-filing is recommended for faster processing.
- Report the QMID — For 2025 improvements, enter the 4-character QMID for each qualifying item on Form 5695.
The IRS provides free instructions and Publications (e.g., 5979) with examples.
Key Deadlines for 2026 Tax Filers
- You must file your 2025 tax return (due April 15, 2026, or October 15 with extension) to claim credit for windows installed in 2025.
- The credit is no longer available for any windows installed in 2026 or later.
Common Mistakes to Avoid
- Claiming windows installed after December 31, 2025.
- Forgetting to include the QMID on 2025 claims.
- Including labor or installation costs.
- Claiming on a second home or rental property.
- Missing ENERGY STAR Most Efficient certification.
Double-check everything with a tax professional if your situation is complex.
Additional Savings: State Incentives and Other Federal Credits
While the federal 25C credit for windows has ended for new installations, check your state energy office or utility company for local rebates or incentives that may still be available. You can also explore other active federal credits like the Residential Clean Energy Credit for solar or geothermal upgrades.
Frequently Asked Questions About Claiming Energy Efficient Windows Deduction
Can I claim the credit if I installed windows in 2024 or earlier?
Yes, as long as they met the standards in effect at the time of installation.
Do I need to itemize deductions to claim this?
No—this is a tax credit that reduces your tax bill directly, even if you take the standard deduction.
What if my windows don’t have a QMID?
The credit may be disallowed for 2025 installations without it. Contact your manufacturer immediately.
Where can I find the most up-to-date information?
Visit the official IRS Energy Efficient Home Improvement Credit page and ENERGY STAR Federal Tax Credits section for the latest guidance.
By claiming your eligible energy efficient windows credit now, you can lower your 2025 tax bill while enjoying lower energy costs for years to come. Always consult a qualified tax advisor or use IRS Free File tools for personalized advice. Start gathering your documents today and file confidently!