A federal home insulation tax credit is still claimable for work completed in 2025 or earlier, but it is not available for insulation installed in 2026 or later. The Energy Efficient Home Improvement Credit under Section 25C paid 30% of qualifying insulation material costs, capped at $1,200 per year, and was terminated for property placed in service after December 31, 2025. If you insulated your home in 2025 or an earlier year and haven’t claimed the credit yet, you can still do so on that year’s return or by amending it.
Why 2026 Insulation No Longer Qualifies
The Inflation Reduction Act of 2022 had extended the Section 25C credit through December 31, 2032. The One Big Beautiful Bill Act, signed into law on July 4, 2025, cut that timeline short and ended the credit for any property placed in service after December 31, 2025.1Internal Revenue Service. FAQs for Modification of Sections 25C, 25D, 25E, 30C, 30D, 45L, 45W, and 179D Under Public Law 119-21
“Placed in service” means the insulation was fully installed and functional in your home, not just purchased. Materials sitting in your garage on December 31, 2025 do not count.
How Much the Credit Was Worth
The credit equaled 30% of the cost of qualifying insulation materials, up to an annual cap of $1,200 that covered building envelope and efficiency improvements combined.2Office of the Law Revision Counsel. 26 USC 25C Energy Efficient Home Improvement Credit Spend $4,000 on materials and you hit the ceiling exactly.
The credit is nonrefundable. It reduces your federal tax bill dollar for dollar, but only down to zero. If you owed $3,000 and qualified for a $1,200 credit, your bill dropped to $1,800. If your total tax liability for the year was only $800, the credit was capped at $800 and the remaining $400 disappeared. There is no carryforward, so leftover credit does not roll into the next year.3ENERGY STAR. Federal Tax Credits for Energy Efficiency
The cap resets each tax year. A homeowner who claimed $1,200 for insulation in 2024 could claim another $1,200 for different improvements in 2025.4Internal Revenue Service. Updates to Frequently Asked Questions About the Energy Efficient Home Improvement Credit and the Residential Clean Energy Property Credit
What Insulation Qualified
Qualifying materials included fiberglass batts, blown-in cellulose, rigid foam board, spray foam, and mineral wool. Air-sealing components such as weatherstripping and caulk also qualified when used to reduce air infiltration.2Office of the Law Revision Counsel. 26 USC 25C Energy Efficient Home Improvement Credit
Every qualifying product had to meet the International Energy Conservation Code standard in effect two calendar years before the installation year. Insulation installed in 2025 had to meet the IECC standard in effect on January 1, 2023.5Internal Revenue Service. Energy Efficient Home Improvement Credit
Labor did not count. Only the material cost qualified for the insulation credit. If a contractor charged $5,000 total but $2,000 of that was labor, the credit was calculated on the $3,000 in materials, yielding $900. You need an invoice that separates material costs from installation charges.6Internal Revenue Service. Energy Efficient Home Improvement Credit – Labor Costs
Which Homes Qualified
The credit applied only to your principal residence, the home where you lived most of the time. A temporary absence for work, school, or vacation did not change that.7Internal Revenue Service. Instructions for Form 5695 (2025) Four common situations were shut out:
- Rental properties. Landlords could not claim the credit for insulation in a home they rented to tenants.
- Second homes. Vacation houses, cabins, and other secondary residences did not qualify.
- New construction. The credit only covered improvements to existing homes.
- Renters. If you rented and paid for insulation yourself, the credit was unavailable because you didn’t own the property.
All four exclusions come from the same rule: you had to both own the home and use it as your primary residence.8Internal Revenue Service. Energy Efficient Home Improvement Credit – Qualifying Residence
Home-office use is treated on a sliding scale. Business use of 20% or less had no effect on the credit. Above 20%, the credit was reduced to reflect only the personal-use portion of the expense. A home used entirely for business did not qualify at all.5Internal Revenue Service. Energy Efficient Home Improvement Credit
How Rebates Change the Number
A rebate from a manufacturer, distributor, or installer tied to the purchase price reduces your qualifying expenses before you apply the 30%. Buy $4,000 in insulation and receive a $500 manufacturer rebate, and your qualifying cost is $3,500, producing a $1,050 credit.5Internal Revenue Service. Energy Efficient Home Improvement Credit
Utility subsidies for buying or installing energy-efficient materials also reduce qualifying expenses, whether the utility pays you or your contractor directly. State energy efficiency incentives generally do not reduce your qualified costs unless they act as a direct purchase-price adjustment.
How to Claim the Credit for 2025 or an Earlier Year
If you installed qualifying insulation in 2025 and are filing your return now, gather three items:
- Itemized receipts showing insulation material costs separated from labor charges.
- A Manufacturer’s Certification Statement confirming the product meets the applicable IECC standard and qualifies for the credit.9Internal Revenue Service. Energy Efficient Home Improvement Credit Qualified Manufacturer Requirements
- IRS Form 5695, where you enter the material cost on the lines for building envelope components. The form walks through the 30% calculation and applies the $1,200 cap.10Internal Revenue Service. Form 5695 – Residential Energy Credits
Attach the completed Form 5695 to your Form 1040. The credit flows through Schedule 3 into your main return. Keep the receipts and the manufacturer’s certification statement for at least three years after filing, which covers the standard IRS audit period.11Internal Revenue Service. How Long Should I Keep Records
Missed It on a Prior Return? Amend
If you installed insulation in 2023, 2024, or 2025 and forgot to claim the credit, file an amended return on Form 1040-X. The deadline is three years from the date you filed the original return for that year, or two years from the date you paid the tax, whichever is later.12Internal Revenue Service. Topic No. 308 Amended Returns A 2023 return filed on April 15, 2024 can be amended through April 15, 2027.
Attach a completed Form 5695 to the amended return showing the credit you should have claimed. The IRS accepts Form 1040-X electronically, and direct deposit speeds up any resulting refund.13Internal Revenue Service. Instructions for Form 1040-X (12/2025) With the credit permanently gone for future installations, a look back at recent returns is worth the time.