By The Roofing Brief Team. Last reviewed: October 2026.
There is no federal insulation tax credit 2026 homeowners can claim: the attic insulation tax credit ended on December 31, 2025. Insulation and air sealing counted toward the Section 25C Energy Efficient Home Improvement Credit, worth 30% of material cost up to $1,200 per year, but Public Law 119-21 (signed July 4, 2025) moved the credit’s expiration up from 2032 to the end of 2025. Work placed in service in 2026 or later gets no federal credit. If your attic insulation was finished and in use by December 31, 2025, you can still claim it on your 2025 tax return, filed in 2026.
Can you still get an attic insulation tax credit in 2026?
No federal credit exists for attic insulation installed in 2026. The 25C Energy Efficient Home Improvement Credit applied only to qualifying products placed in service between January 1, 2023 and December 31, 2025, and the IRS FAQ on Public Law 119-21 states the credit “will not be allowed for any property placed in service after December 31, 2025.” Congress terminated it early under Section 70505 of the 2025 reconciliation law. The one exception: if your project was completed and ready for use on or before December 31, 2025, it belongs on your 2025 federal return even though you file in 2026.
The key test is the installation date, not when you paid. The IRS Energy Efficient Home Improvement Credit page says you “must claim the credit for the tax year when the property is installed, not merely purchased.” Signing a contract, paying a deposit, or ordering material in 2025 does not qualify a project if the insulation was not actually installed and functional by December 31, 2025.
| If your situation is | Then | Source |
|---|---|---|
| Insulation installed in your main home by December 31, 2025 | Claim 30% of material cost, up to $1,200, on the 2025 Form 5695, Part II, line 18a | IRS; Form 5695 instructions |
| Paid or ordered in 2025, installed in 2026 | No federal credit | IRS FAQ on PL 119-21 |
| Installed in 2026, household income under 80% of area median | Check your state’s HEEHR rebate: up to 100% of cost, capped at $1,600 for insulation, air sealing and ventilation | 42 U.S.C. 18795a |
| Installed in 2026, income 80% to 150% of area median | HEEHR rebate of up to 50% of cost, same $1,600 cap | 42 U.S.C. 18795a |
| Installed in 2026, income above 150% of area median | HOMES whole-home rebate (savings-based) or utility rebates | DOE |
| Rental property you do not live in | No 25C at any time; depreciate as an improvement over 27.5 years | IRS; Publication 527 |
What the 25C insulation tax credit paid while it was active
Through the end of 2025, the 25C credit returned 30% of the cost of qualifying insulation and air-sealing materials, capped at $1,200 per year. That $1,200 was a shared annual limit covering insulation, air sealing, exterior doors ($250 per door, $500 total), windows and skylights ($600), and a home energy audit ($150), within an overall $3,200 annual limit that included up to $2,000 for heat pumps, per the IRS. Only material cost qualified for insulation: the IRS states that “labor costs for installing building envelope components don’t qualify,” which set insulation apart from heat pumps and other equipment where labor did count.
| Feature | 25C credit (through Dec 31, 2025) | 2026 and later |
|---|---|---|
| Credit rate | 30% of material cost | No federal credit |
| Annual cap | $1,200 (shared with doors, windows, audit) | Not applicable |
| Labor covered | No, materials only for insulation | Not applicable |
| Eligible home | Existing main home in the US | Not applicable |
| IECC standard | IECC in effect 2 years earlier (2025 installs: the IECC in effect January 1, 2023) | Not applicable |
| How to claim | IRS Form 5695, Part II, line 18a | State and utility rebates instead |
| Carryforward | None, unused credit is lost | Not applicable |
| Worked example (2025 install) | Material cost | 30% of cost | Credit allowed |
|---|---|---|---|
| Blown-in attic top-up | $2,000 | $600 | $600 |
| Full attic job, no rebate | $5,000 | $1,500 | $1,200 (annual cap) |
| Full attic job, $500 utility rebate | $4,500 after rebate | $1,350 | $1,200 (annual cap) |
Eligibility rules were strict. The IRS required an existing home, not a new one, that is your main home; landlords who do not live in the home cannot claim it, and ENERGY STAR’s insulation tax credit page adds that second homes and renters were excluded. Qualifying insulation covered “batts, rolls, blow-in fibers, rigid boards, expanding spray, and pour-in-place” products, per ENERGY STAR. Air-sealing materials such as weather stripping, caulk, house wrap, and canned spray foam qualified only when they carried a Manufacturer’s Certification Statement.
What insulation qualified, and does a radiant barrier count?
Through 2025, line 18a of Form 5695 covered any insulation or air sealing material or system, including a vapor retarder, “specifically and primarily designed to reduce the heat loss or gain” of the home and meeting IECC criteria, per the Form 5695 instructions. A product that provides structural support or a finished surface, such as drywall or siding, did not count. Unlike windows, skylights and doors, insulation did not need a qualified manufacturer identification number (QMID) on the 2025 form.
Radiant barriers sat in a gray zone. IRS Notice 2013-70 (Q&A 19) let a radiant barrier maker certify eligibility using the IECC U-factor instead of an R-value, so a radiant barrier qualified only with that kind of written manufacturer certification. For 2026 installs the question is moot: no radiant barrier or other insulation product qualifies for 25C after December 31, 2025.
Is attic insulation tax deductible, or is it a credit?
Attic insulation was a tax credit under 25C, not a deduction, and the two work differently. A credit subtracts directly from the tax you owe, so a $1,000 credit cut your bill by $1,000. A deduction only reduces taxable income, so its value depends on your bracket. For a primary residence, homeowners could not deduct attic insulation as a personal expense at all; the 25C credit was the only federal break, and it has now expired.
Landlords and home-office filers sit in a different category. IRS Publication 527 lists insulation among the improvements to a rental property, recovered through depreciation rather than a personal credit, and residential rental property is depreciated over 27.5 years under the general MACRS system. Those rules were not changed by the 2025 law and are separate from 25C. Depreciation treatment depends on your structure and use, so ask a tax professional how the improvement is classed on your return.
How to claim attic insulation finished in 2025
If your attic insulation was placed in service by December 31, 2025, you claim the credit on your 2025 federal return using IRS Form 5695, Part II. The IRS says the credit is nonrefundable and “you can’t apply any excess credit to future tax years,” so any amount above your tax liability for the year is lost. Keep your receipts and any manufacturer certification statements with your records; the Form 5695 instructions say not to attach the certification to your return.
- Confirm the insulation was installed and ready for use on or before December 31, 2025.
- Total your qualifying material costs. Exclude labor, and exclude any portion covered by a rebate.
- Check that your combined 25C items for the year do not exceed the $1,200 annual cap.
- Enter insulation and air sealing costs on Form 5695, Part II, line 18a, complete Part II, and carry the result to Schedule 3 of your Form 1040.
- Retain receipts and Manufacturer’s Certification Statements in case of an IRS query.
Subtract rebates that are based on the cost of the property, and public utility subsidies, from your qualified expenses before calculating the credit; the IRS treats them as a purchase price adjustment. State energy efficiency incentives are generally not subtracted unless they qualify as a rebate under federal tax law, and IRS Announcement 2024-19 covers the tax treatment of DOE Home Energy Rebates.
Attic insulation rebates that replace the credit in 2026
With the federal credit gone, rebates are the main way to cut attic insulation costs in 2026. Two sources matter most: state-run Home Energy Rebate programs funded by the federal government, and rebates offered directly by local utilities. Under 42 U.S.C. 18795a, the High-Efficiency Electric Home Rebate (HEEHR) pays up to $1,600 for insulation, air sealing, and ventilation, covering up to 100% of cost for households under 80% of area median income and up to 50% for households at 80% to 150%, with a $14,000 total cap per household.
These rebates are administered state by state. The DOE Home Energy Rebates page says Home Energy Rebates “are now available in select states” and directs homeowners to their State Energy Office for status and eligibility. Its HOMES program offers up to $8,000 for whole-home upgrades with at least 20% modeled energy savings, and lists insulation and air sealing among the pathways. Utility rebates run on their own separate schedules and often stack with state programs. Check your state energy office and your utility’s efficiency program before you sign a contract, because eligibility and funding can change during the year.
- HEEHR (state Home Energy Rebates): federally funded, income-tiered, up to $1,600 for insulation, air sealing and ventilation, at point of sale or through contractors, availability depends on your state.
- HOMES: savings-based whole-home rebates of up to $8,000 per DOE, open to all income levels where your state runs it.
- Utility rebates: offered by many electric and gas providers, often paid per square foot or as a flat amount, frequently require a pre-approval or energy audit.
- State and local incentives: some states and municipalities run their own insulation or weatherization credits and low-income programs separate from the federal money.
If no rebate is available where you live, compare the cheapest ways to insulate an attic in 2026.
What this means before you insulate
For a 2026 attic insulation project, budget as if there is no federal credit, then treat any rebate you secure as a bonus. Confirm the rebate before work starts, since most programs require pre-approval and will not pay retroactively. Some contractor pages ranking for 2026 insulation credit searches still describe a 30% credit up to $1,200 as available now; per the IRS, it applies only to work installed by December 31, 2025.
Because insulation labor was never covered even under 25C, the cost math for a 2026 job looks like a late-2025 job without the material credit: on a $5,000 materials bill, that is up to $1,200 less in tax savings. Compare quotes on installed cost, verify R-value for your climate zone, and apply any utility or state rebate at the point of purchase where possible.
Related reading on The Roofing Brief
For the mechanics of the job itself, see our guide to attic insulation types and R-value by climate zone and how much it costs to insulate an attic. Because air sealing shared the same 25C category, review what to air seal before you insulate. For other federal energy credits after Public Law 119-21, compare the solar roof tax credit in 2026 and read whether a new roof is tax deductible.
Frequently asked questions
Is there an attic insulation tax credit in 2026?
No. The federal 25C Energy Efficient Home Improvement Credit that covered attic insulation is not allowed for property placed in service after December 31, 2025, under Public Law 119-21. Insulation installed in 2026 or later earns no federal tax credit. Work completed and ready for use by December 31, 2025 can still be claimed on your 2025 return filed in 2026.
Is attic insulation tax deductible?
Attic insulation on a primary residence was never a deduction. Through 2025 it qualified for the 25C tax credit, which subtracts from tax owed rather than from taxable income. That credit has now expired. On a rental property, IRS Publication 527 lists insulation as an improvement that is depreciated, over 27.5 years for residential rental property.
How much was the insulation tax credit worth?
The 25C credit paid 30% of the cost of qualifying insulation and air-sealing materials, capped at $1,200 per year. That cap was shared with exterior doors, windows and skylights, and a home energy audit. A $5,000 materials bill hit the $1,200 cap; labor was excluded, and the credit did not carry forward to later years.
Did the insulation tax credit cover labor?
No. The IRS states that labor costs for installing building envelope components, including insulation and air sealing, don’t qualify. Installation labor counted only for residential energy property such as heat pumps. This made professional installation a larger share of the final bill relative to the credit you could claim.
What insulation qualified for the energy tax credit?
Through 2025, bulk insulation such as batts, rolls, blow-in fibers, rigid boards, expanding spray and pour-in-place products qualified, per ENERGY STAR, if it met IECC criteria. Air sealing products needed a Manufacturer’s Certification Statement. A radiant barrier qualified only with written manufacturer certification, per IRS Notice 2013-70. Nothing qualifies for work installed in 2026.
What form claims the insulation tax credit?
Homeowners claimed the credit on IRS Form 5695, Part II, entering insulation and air sealing costs on line 18a, then carried the total to Schedule 3 of Form 1040. The credit is nonrefundable and has no carryforward, so any amount above your tax liability for that year is lost permanently.
Are there attic insulation rebates in 2026?
Yes, though not from the federal tax code. The HEEHR program pays up to $1,600 for insulation, air sealing and ventilation for households under 150% of area median income, and DOE says Home Energy Rebates are available in select states. Many utilities also offer their own rebates, so confirm with your State Energy Office and utility before you start.