Homeowners who upgraded their attic insulation in 2025 left $1.2 billion in unclaimed federal tax credits on the table, according to IRS filing data. The federal Energy Efficient Home Improvement Credit (Section 25C) ended for property placed in service after December 31, 2025 (IRS FS-2025-05). Federal tax credits for this work have ended, but state, local and utility rebates may still apply; check what is available at your address with the DuloCore rebate calculator. And qualifying 2025 installations are claimed on the 2025 return during the 2026 filing season.
What percentage of insulation costs can you claim as a tax credit?
The federal Energy Efficient Home Improvement Credit (Section 25C) ended for property placed in service after December 31, 2025 (IRS FS-2025-05). The credit applied to attic, wall, floor, and crawlspace insulation that met or exceeded Energy Star thermal resistance requirements. And homeowners who installed by December 31, 2025 could claim it on both materials and labor, unlike state rebates that often exclude installation fees.
Check the rebate calculator to see state, local and utility rebates based on your project scope.
Is there a maximum limit on how much you can claim for insulation tax credits?
The annual credit cap was $1,200 for insulation and air sealing combined, separate from the $2,000 limit for heat pumps and other mechanical equipment. This $1,200 limit applied per tax year; the federal Energy Efficient Home Improvement Credit (Section 25C) ended for property placed in service after December 31, 2025 (IRS FS-2025-05). The cap included all envelope improvements filed in the same year, including windows, doors, and weather stripping.
Which insulation materials and equipment qualify for the tax credit?
The credit covered spray foam, blown-in fiberglass, cellulose, mineral wool, rigid foam boards, and reflective barriers that met Energy Star criteria. And air sealing materials like caulk, weather stripping, and spray foam used to close leaks around windows, doors, and ductwork also qualified. The federal Energy Efficient Home Improvement Credit (Section 25C) ended for property placed in service after December 31, 2025 (IRS FS-2025-05).
Compare insulation rebates to maximize state and utility incentives.
Do you need to meet income requirements to claim the insulation tax credit?
The federal Energy Efficient Home Improvement Credit (Section 25C) ended for property placed in service after December 31, 2025 (IRS FS-2025-05).
Low-income households often benefit from state rebates that provide upfront point-of-sale discounts. Compare heat pump rebates for direct payment programs in your state.
What form do you use to file for the insulation tax credit on your taxes?
Form 5695 only covers qualifying work completed by December 31, 2025 and claimed on a 2025 return; the federal 25C and 25D credits ended after that date (IRS FS-2025-05).
Form 5695 only covers qualifying work completed by December 31, 2025 and claimed on a 2025 return; the federal 25C and 25D credits ended after that date (IRS FS-2025-05).
When does the insulation tax credit start and end?
The federal Energy Efficient Home Improvement Credit (Section 25C) ended for property placed in service after December 31, 2025 (IRS FS-2025-05). And retroactive claims are allowed for 2023, 2024, and 2025 installations if taxpayers file amended returns within three years of the original filing deadline.
The federal Energy Efficient Home Improvement Credit (Section 25C) ended for property placed in service after December 31, 2025 (IRS FS-2025-05).
State and utility rebates operate on separate calendars, often with fiscal year funding that expires June 30 rather than December 31.
Can you combine the insulation tax credit with other energy tax credits?
The $1,200 insulation cap was separate from the $2,000 annual limit for heat pumps, water heaters, and biomass stoves; both ended for property placed in service after December 31, 2025 (IRS FS-2025-05). The federal Residential Clean Energy Credit (Section 25D) ended for expenditures made after December 31, 2025, and the IRS treats an expenditure as made when installation is completed (IRS FS-2025-05).
Use the rebate calculator to model combined state and local savings for your project.
| Program | Credit/Rebate Amount | Cap/Limit | Eligibility | Deadline |
|---|---|---|---|---|
| Federal Tax Credit (IRS) | Ended Dec 31, 2025 | Ended Dec 31, 2025 | — | Ended Dec 31, 2025 |
| State Rebates (varies) | $200-$2,000 flat | Per household | Income-qualified or universal | Varies by state |
| Utility Incentives | $0.10-$0.50/sq ft | Project-specific | Service territory | Seasonal/annual |
Official Sources
- DOE Home Energy Rebates — Federal rebate programs and state implementation status
- IRS Energy Efficient Home Improvement Credit — Official guidance on Form 5695 and qualifying expenses (note: the federal 25C and 25D credits ended for projects completed after December 31, 2025)
- DSIRE Database — State-by-state renewable energy and efficiency incentive tracker
Related Reading: Learn more about Ira Insulation Tax Credits.
Frequently Asked Questions
What is the insulation tax credit and how much can I claim?
The federal Energy Efficient Home Improvement Credit (Section 25C) ended for property placed in service after December 31, 2025 (IRS FS-2025-05). Form 5695 only covers qualifying work completed by December 31, 2025 and claimed on a 2025 return; the federal 25C and 25D credits ended after that date (IRS FS-2025-05). The $1,200 cap included all envelope improvements like windows and doors.
Am I eligible for the insulation tax credit if I already claimed it before?
The federal Energy Efficient Home Improvement Credit (Section 25C) ended for property placed in service after December 31, 2025 (IRS FS-2025-05).
What types of insulation materials qualify for the tax credit?
Spray foam, blown-in fiberglass, cellulose, mineral wool, rigid foam boards, and reflective barriers qualified if they met Energy Star thermal resistance standards, along with air sealing materials like caulk, weather stripping, and expanding foam. The federal Energy Efficient Home Improvement Credit (Section 25C) ended for property placed in service after December 31, 2025 (IRS FS-2025-05).
What is the deadline to claim the insulation tax credit?
The federal Energy Efficient Home Improvement Credit (Section 25C) ended for property placed in service after December 31, 2025 (IRS FS-2025-05). Taxpayers can file amended returns to claim credits for 2023, 2024, or 2025 installations within three years of the original filing deadline.
How do I claim the insulation tax credit on my tax return?
Form 5695 only covers qualifying work completed by December 31, 2025 and claimed on a 2025 return; the federal 25C and 25D credits ended after that date (IRS FS-2025-05).
Ready to calculate your insulation rebate savings? Use our free rebate calculator to estimate your state rebates and utility incentives based on your zip code and project scope. Get your personalized savings report in under 60 seconds.
Last reviewed: April 14, 2026. Reviewed by DuloCore Energy Specialists. About the team.
Check your California insulation rebate eligibility — see the programs you qualify for and the dollar amounts on our California insulation rebate finder.