Massachusetts Window Rebates 2026: The Energy Efficient Home Improvement Credit Has Ended
The federal energy efficient home improvement credit (25C) covered 30% of window costs up to $600 a year. It was repealed on 31 December 2025. Mass Save still pays $75 per window. Here's exactly what you get now, and who can still claim the credit.
Key Takeaways
- Mass Save: $75 per window on single-pane replacements. There is no Mass Save door rebate.
- Federal 25C tax credit: 30% of costs, up to $600/year, repealed 31 Dec 2025
- Windows must be ENERGY STAR certified (U-Factor ≤ 0.25 for MA)
- Finished the work by 31 Dec 2025? You can still claim the 25C tax credit on that year's return
Window replacements are expensive. A full-house project with 15-20 windows can run $10,000 to $25,000. That's a number that makes most homeowners put the project off for "next year", every year.
Until recently Massachusetts homeowners had two programmes working in their favour. Mass Save pays $75 per window when you replace single-pane glass, and that is unchanged for 2026. The federal energy efficient home improvement tax credit, Section 25C, added 30% of your remaining costs on top, up to $600 a year for windows and $500 for exterior doors. The One Big Beautiful Bill Act (P.L. 119-21) repealed 25C for anything placed in service after 31 December 2025.
So a 10-window replacement nets $750 from Mass Save in 2026. The same project finished in 2025 was worth $1,350 once the tax credit was added, and if that was you, the credit is still claimable on your 2025 return. Either way, $750 closes much of the gap between builder-grade and premium ENERGY STAR windows.
Here's how to claim everything you're entitled to.
How Much Can You Save on Windows and Doors?
Two separate programs, two separate claims, one significant savings stack:
2026 Massachusetts Window & Door Rebates
| Product | Mass Save Rebate | Federal 25C Credit (repealed) | Example Savings |
|---|---|---|---|
| ENERGY STAR Windows | Up to $75/window | Ended 31 Dec 2025 | 10 windows = $750 |
| ENERGY STAR Exterior Doors | Varies by utility | Ended 31 Dec 2025 | Confirm at your assessment |
| Skylights | Varies by utility | Ended 31 Dec 2025 | Confirm at your assessment |
| Storm Windows/Doors | Varies by utility | Never eligible | Check with your utility |
Real Example: 10-Window Replacement
* That's $750 saved. Through 2025 the federal 25C credit added another $600, and splitting the project across two tax years captured $600 twice. Neither is available for 2026 work.
What Windows and Doors Qualify?
Not every window qualifies. Both programs require ENERGY STAR certification, and Massachusetts falls in the Northern Climate Zone, which has stricter performance requirements than warmer states.
Window Requirements
- ENERGY STAR certified for the Northern Climate Zone
- U-Factor of 0.25 or lower (measures insulating ability: lower is better)
- SHGC of 0.40 or lower (Solar Heat Gain Coefficient: how much solar heat passes through)
- NFRC label required: keep this label as proof for your rebate claim
Most major brands (Andersen, Pella, Marvin, Harvey, Milgard) carry ENERGY STAR Northern Zone models. Your contractor or window showroom can filter for qualifying products.
Door Requirements (25C, 2025 and earlier)
Mass Save has never rebated exterior doors, so these were the criteria for the federal energy efficient home improvement tax credit. They matter only if you are filing for work completed on or before 31 December 2025.
- ENERGY STAR certified exterior doors
- U-Factor of 0.17 or lower for opaque doors, 0.25 or lower for doors with glass
- Includes entry doors, sliding glass doors, and French doors
- Interior doors never qualified
Look for the NFRC Label
Every qualifying window has a National Fenestration Rating Council (NFRC) label showing its U-Factor and SHGC ratings. Keep this label. The IRS requires it to claim the 25C credit. Take a photo before installation in case the label is covered.
How to Claim Your Window and Door Rebates
The Mass Save rebate is claimed through your utility. The federal credit had its own separate process, described below for anyone still filing a 2025 return:
Mass Save Rebate (Instant or Mail-In)
- Schedule a Home Energy Assessment: some utilities require this before approving window rebates. It's free and identifies all available rebates for your home.
- Purchase ENERGY STAR windows/doors: buy from any retailer or contractor. Keep all receipts.
- Submit your rebate application: through your utility's Mass Save portal. Attach receipts and ENERGY STAR documentation.
- Receive your rebate: typically arrives within 4-8 weeks as a check or bill credit.
Federal 25C Tax Credit (2025 and earlier)
- Keep all documentation: NFRC labels, receipts, and contractor invoices
- File IRS Form 5695: "Residential Energy Credits", for 2025 and earlier returns only
- Claim 30% of costs: up to $600 for windows, $500 for exterior doors. Applied to work finished by 31 Dec 2025 only.
- Receive the credit: applied directly to your tax bill (reduces what you owe dollar-for-dollar)
Tax Credit vs. Tax Deduction
The 25C was a tax credit, not a deduction. A $600 credit saved you $600 in taxes regardless of your bracket, a dollar-for-dollar reduction in what you owed. It no longer applies to work done in 2026.
What Stacking Looked Like Before the Repeal
Through 2025 you could claim both: the Mass Save rebate came from your utility, the federal credit from the IRS, and there was no conflict or overlap. The federal 25C credit was repealed effective 31 December 2025, so for 2026 work the Mass Save rebate is the only one left.
One thing to note about how this used to work: the federal credit was calculated on your cost after the Mass Save rebate. If your windows cost $8,500 and you received $750 from Mass Save, the 25C credit applied to the remaining $7,750, capped at $600. That calculation no longer applies to work done in 2026.
You can still combine window rebates with other Mass Save rebates in the same year: insulation, heat pumps and thermostats each have their own rebate. The 25C credit used to add separate annual limits on top for windows ($600), doors ($500), heat pumps ($2,000) and insulation ($1,200), but it was repealed on 31 December 2025. See our guide to stacking rebates for the full breakdown.
Three Ways to Maximize Your Window Rebate Savings
1. Split Large Projects Across Two Tax Years
This used to be the biggest money move most people missed. The federal credit capped windows at $600 a year, so replacing 20 windows across two tax years (10 in December, 10 in January) claimed $600 twice instead of once. With 25C repealed as of 31 December 2025, there is no annual cap to plan around and no tax reason to delay half the job.
The Mass Save rebate has no annual limit, so you get the full $75 per window either way.
2. Combine with Other Energy Upgrades
While your contractor is at your house, consider adding insulation (75% covered by Mass Save) or upgrading to a heat pump (up to $8,500 in rebates). Each upgrade has its own separate rebate limit. Bundling projects often reduces total labor costs too.
3. Get the Home Energy Assessment First
The free Mass Save Home Energy Assessment identifies every rebate your home qualifies for, not just windows. You might discover that insulation or air sealing would save more energy per dollar, and you can plan your upgrades in the most cost-effective order.
Are Window Rebates Worth the Effort?
Window rebates are smaller per unit than heat pump or insulation rebates. That's just the math. So the honest question is: should you prioritize windows?
Replace windows now if:
- Your current windows are single-pane or visibly failing (fogged glass, broken seals, drafty frames)
- You're already planning a renovation and windows are in the budget
- Your home is already insulated and windows are the remaining weak point
- You want to reduce street noise (triple-pane windows are dramatically quieter)
Prioritize other upgrades first if:
- Your attic and walls need insulation (75-100% covered by Mass Save, much higher ROI)
- Your heating system is oil, propane, or electric baseboard (heat pump switch saves $1,500+/year)
- Your windows are double-pane and functioning (the energy savings from replacement are modest)
The energy assessment will help you sort this out. The assessor can measure exactly how much heat your windows are losing and compare it to other upgrade options. Then you can make the call with real data, not guesswork.
The Bottom Line
Window and door replacements aren't the biggest rebate in Massachusetts. That honor goes to heat pumps and insulation. But $1,350+ in combined savings on a 10-window project is nothing to ignore, especially if your windows are old and your energy bills show it.
The key strategies now: use ENERGY STAR certified products, confirm eligibility at your Home Energy Assessment, and claim the Mass Save rebate on every single-pane window you replace. The federal 25C credit and the split-across-tax-years trick both ended on 31 December 2025.
Start with a free Home Energy Assessment to see where windows fit in your overall upgrade plan. You might find that adding insulation first (at 75% off) makes your windows perform better too, and the assessment itself includes free weatherstripping and air sealing.
See All Massachusetts Window & Door Rebates
Full breakdown of rebate amounts, qualifying products, and how to claim.
Frequently Asked Questions
How much is the window rebate in Massachusetts?
Mass Save offers up to $75 per ENERGY STAR window when you replace single-pane glass, verified at a Home Energy Assessment. A 10-window project is therefore worth $750. The federal 25C credit that used to add 30% of the remaining cost, up to $600 a year, was repealed effective 31 December 2025.
Do I need ENERGY STAR windows to get the rebate?
Yes. The Mass Save rebate requires ENERGY STAR certified windows, and for Massachusetts (Northern Climate Zone) they must have a U-Factor of 0.25 or lower. The federal 25C credit had the same requirement before it was repealed on 31 December 2025. Most major brands carry qualifying models.
Can I replace windows myself and still get the rebate?
Mass Save rebates may require a participating contractor depending on your utility, so check with your provider before starting. DIY installation used to qualify for the federal 25C credit provided you used ENERGY STAR certified products and kept the NFRC labels and receipts, but that credit was repealed on 31 December 2025.
Should I replace windows or add insulation first?
Insulation almost always gives you more savings per dollar. A Mass Save Home Energy Assessment will help you prioritize. That said, if your windows are single-pane or visibly damaged, replacing them alongside insulation makes sense. You'll get rebates on both.
Do window rebates apply to doors too?
No. Mass Save has no exterior door rebate. Its Insulation & Windows programme covers insulation, air sealing and windows only, verified against masssave.com in August 2026. The federal energy efficient home improvement tax credit did cover doors at 30% up to $500 a year, separate from the $600 window limit, but 25C was repealed effective 31 December 2025.
Can I spread window replacements across multiple tax years?
It used to be a smart strategy, because the federal 25C credit capped windows at $600 a year and splitting a 20-window job across two tax years netted $1,200 instead of $600. Since 25C was repealed on 31 December 2025 there is no annual cap left to work around. The Mass Save rebate is per window, so phase the work to suit your budget instead.