The federal 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 the One Big Beautiful Bill Act (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. 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 placed-in-service date, not when you paid. The IRS treats an improvement as placed in service when it is ready and available for its intended use. 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.
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, windows, and a home energy audit. Only material cost qualified for insulation. Labor and installation were not eligible, 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 primary residence in the US | Not applicable |
| How to claim | IRS Form 5695, Part II | State and utility rebates instead |
| Carryforward | None, unused credit is lost | Not applicable |
Eligibility rules were strict. The home had to be an existing house, located in the United States, and owned and used as the taxpayer’s principal residence. New construction, rental properties, and second homes did not qualify for the insulation portion. Qualifying insulation covered batts, rolls, blown-in fiber, rigid boards, spray foam, and pour-in-place products. Air-sealing materials such as weather stripping, caulk, house wrap, and canned spray foam qualified only when they carried a Manufacturer’s Certification Statement.
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. Insulation on a rental or a business-use portion of a home is generally treated as a capital improvement, recovered through depreciation rather than a personal credit. Those rules were not changed by the 2025 law and are separate from 25C. Depreciation treatment depends on your structure and use, so confirm the details with a tax professional.
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 Energy Efficient Home Improvement Credit is nonrefundable and does not carry forward, so any amount above your tax liability for the year is lost. Keep your receipts and any manufacturer certification statements with your records.
- 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.
- Complete IRS Form 5695, 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 any manufacturer or utility rebate from your cost basis before calculating the credit. A rebate is treated as a price reduction, so the credit applies only to what you actually paid after that discount.
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. Insulation, air sealing, and ventilation are named among eligible measures under the federal Home Electrification and Appliance Rebates, with amounts reaching up to $1,600 for envelope work in qualifying households.
These rebates are administered state by state, and rollout timing and income rules vary widely. Some states launched programs in 2025 and 2026, while others are still building them. 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.
- State Home Energy Rebates: federally funded, income-tiered, up to $1,600 for insulation and air sealing in eligible homes, availability depends on your state.
- 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.
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. The energy savings from a properly insulated attic still stand on their own: reducing heat loss through the attic remains one of the highest-return envelope upgrades regardless of tax policy.
Because insulation labor was never covered even under 25C, the cost math for a 2026 job looks similar to a late-2025 job minus the material credit. 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 tax breaks that are still active, 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 expired on December 31, 2025, terminated early by the One Big Beautiful Bill Act. Insulation placed in service 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. Insulation on a rental or business-use property is generally a depreciable capital improvement, which is a separate rule that the 2025 law did not change.
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 a home energy audit. Only material cost counted for insulation; labor was excluded, and the credit did not carry forward to later years.
Did the insulation tax credit cover labor?
No. For insulation and air sealing, the 25C credit applied only to material cost. Installation and labor were not eligible, unlike heat pumps and certain other equipment where labor did count. This made professional installation a larger share of the final bill relative to the credit you could claim.
What form claims the insulation tax credit?
Homeowners claimed the credit on IRS Form 5695, Part II, the Energy Efficient Home Improvement Credit section, 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. State-run Home Energy Rebate programs list insulation, air sealing, and ventilation as eligible measures, with amounts up to $1,600 for envelope work in qualifying households. Many utilities also offer their own rebates. Availability, income rules, and timing vary by state and provider, so confirm before you start.
Reviewed by The Roofing Brief Team. Last reviewed July 2026.