Federal Insulation Tax Credits

Federal tax credits helped eligible homeowners offset part of the cost of qualifying insulation and air-sealing materials installed through December 31, 2025.

The insulation credit was part of the Energy Efficient Home Improvement Credit. For qualifying projects completed in 2023, 2024, or 2025, homeowners may still be able to claim the credit on an original or amended federal tax return.

However, the law has changed. Insulation or air-sealing improvements placed in service after December 31, 2025, do not qualify for this federal credit under current law. Homeowners planning a project in 2026 or later should look for current state, local, manufacturer, and utility insulation rebates instead.

Is the Federal Insulation Tax Credit Still Available?

The federal Energy Efficient Home Improvement Credit is no longer available for insulation or air-sealing improvements placed in service after December 31, 2025.

This means a homeowner who purchases or installs insulation during 2026 generally cannot claim the former federal insulation credit for that project. The relevant date is when the improvement was placed in service—generally when it was installed and ready for use—not simply when a deposit was paid or materials were ordered.

Homeowners may still need information about the credit for several reasons:

• They are preparing a 2025 federal income tax return.
• They installed qualifying insulation in 2023 or 2024 but did not claim the credit.
• They need to amend a previously filed return.
• They want to verify whether a past project qualified.
• They are comparing the expired federal credit with currently available rebate programs.

How the Federal Insulation Tax Credit Worked

For qualifying insulation and air-sealing improvements placed in service from January 1, 2023, through December 31, 2025, the credit generally equaled 30% of eligible expenses.

Insulation and air sealing were classified as qualified energy-efficiency improvements. They fell under a combined annual credit limit of $1,200 that also applied to certain other building-envelope improvements and energy property.

There was no separate lifetime limit during this period. A homeowner could potentially claim qualifying expenses in more than one year, provided each year’s project and tax return independently met the applicable requirements.

Important: The $1,200 figure was a credit limit, not a deduction and not a guarantee that every homeowner would receive $1,200.

Who Could Claim the Insulation Tax Credit?

For insulation and air-sealing materials, the home generally had to meet all of the following conditions:

• It was located in the United States.
• It was an existing home rather than a newly constructed home.
• The taxpayer owned the home.
• The taxpayer used it as their principal residence.
• The original use of the qualifying materials began with the taxpayer.
• The materials were reasonably expected to remain in use for at least five years.

A principal residence is generally the home where a person lives most of the time. Houses, condominiums, cooperative apartments, mobile homes, manufactured homes, and certain houseboats may qualify when the other requirements are satisfied.

Projects That Generally Did Not Qualify

The insulation credit generally was not available for:

• Insulation installed in a newly constructed home
• A rental property owned solely as an investment
• A home the taxpayer rented rather than owned
• Insulation installed in a second or vacation home
• Used or previously installed insulation materials
• Improvements placed in service after December 31, 2025

An addition or renovation to an existing home could potentially qualify. The restriction applied to expenses connected with constructing an entirely new home.

Eligibility depended on both the improvement and the residence. A qualifying insulation product did not automatically produce a tax credit when it was installed in an ineligible property.

What Insulation and Air-Sealing Improvements Qualified?

The credit covered new insulation materials or systems specifically and primarily designed to reduce heat loss or heat gain in a home.

Common qualifying categories could include:

• Fiberglass batts and rolls
• Blown-in fiberglass
• Loose-fill cellulose
• Mineral wool batts or loose-fill products
• Rigid foam board
• Spray polyurethane foam
• Pour-in-place insulation
• Certain reflective insulation systems
• Weatherstripping
• Air-sealing caulk
• Canned spray foam designed for air sealing
• House wrap and certain air-barrier materials
• Vapor retarders or seals that limit infiltration when they met applicable requirements

A product’s general category did not establish eligibility by itself. The installed material or system also had to meet the applicable energy-efficiency criteria.

Materials intended mainly for another purpose may not have qualified merely because they provided some insulating or air-sealing value. For example, ordinary roofing, siding, structural lumber, or drywall generally would not become eligible insulation expenses simply because they formed part of the building enclosure.

Examples of Potentially Eligible Improvements

Improvement	Potentially Eligible?	Important Consideration
Fiberglass attic insulation	Yes	Material and installation level had to meet applicable criteria
Blown-in cellulose	Yes	Only qualifying material costs counted
Mineral wool batts	Yes	Product had to be new and installed in an eligible home
Spray foam insulation	Yes	The material portion could qualify; installation labor did not
Rigid foam board	Yes	Had to be designed primarily to reduce heat loss or gain
Weatherstripping	Yes	Had to be designed to reduce air leakage
Air-sealing caulk	Yes	Only products intended for air sealing were generally eligible
Contractor labor	No	Labor for building-envelope improvements was excluded
Drywall replacement	Generally no	It is not primarily an insulation or air-sealing material
Attic storage platform	No	It does not primarily reduce heat transfer
New-home insulation	No	The credit applied to improvements to existing homes

Which Project Costs Were Eligible?

For insulation and air-sealing projects, the credit was calculated using qualifying product or material costs.

Eligible expenses could include the amount paid for qualifying:

• Insulation materials
• Air-sealing materials
• Insulation systems
• Air-barrier or infiltration-control products

The IRS excluded amounts paid for onsite preparation, assembly, and original installation of building-envelope components.

Costs That Did Not Count

Homeowners generally could not include:

• Contractor installation labor
• Demolition or insulation-removal labor
• Attic or crawl-space cleanup
• Mold remediation
• Pest removal
• Electrical or plumbing relocation
• Drywall removal and replacement
• Painting or finish work
• Permit fees unrelated to qualifying materials
• Equipment rental
• General home-repair costs
• Interest and financing charges

When a contractor provided one combined project price, the homeowner needed documentation that separated eligible material costs from ineligible labor and other work.

What Efficiency Requirements Applied?

Qualifying insulation and air-sealing materials had to meet the prescriptive criteria established by the applicable version of the International Energy Conservation Code, or IECC.

For materials placed in service during 2024 and 2025, the IRS identified the 2021 IECC as the applicable standard. Relevant criteria included:

• Insulation levels for different building assemblies
• Air-leakage provisions
• Installation quality
• Continuity of the thermal envelope and air barrier
• Climate-zone-specific requirements

This did not necessarily mean that a homeowner had to bring the entire home into full compliance with every provision of the IECC. The installed materials or systems had to meet the applicable criteria for the improvement being claimed.

For example, a homeowner could complete attic air sealing in one year and install additional attic insulation in another year. Each year’s materials still had to independently satisfy the requirements that applied to those materials.

Why Climate Zone Matters

Recommended and code-prescribed insulation levels differ by climate. An attic project in a cold northern climate may require a different insulation level than a similar project in a warm southern climate.

Homeowners should not assume that adding any amount of insulation automatically satisfied the credit requirements. The existing insulation level, project location, assembly type, installed R-value, and installation quality could all matter.

How Was the Credit Calculated?

The basic calculation was:

Qualifying insulation and air-sealing material costs × 30% = potential credit

The result was then subject to the combined $1,200 annual limit and the homeowner’s federal income-tax liability.

Example Credit Calculations

Qualifying Material Cost	30% Calculation	Potential Insulation Credit
$1,000	$1,000 × 30%	$300
$2,500	$2,500 × 30%	$750
$4,000	$4,000 × 30%	$1,200
$6,000	$6,000 × 30%	$1,200 maximum

Example: Contractor-Installed Attic Insulation

A homeowner paid:

• $2,800 for qualifying insulation materials
• $1,700 for installation labor
• $500 for removal and cleanup

Only the $2,800 material cost would generally enter the insulation-credit calculation.

$2,800 × 30% = $840 potential credit

The labor, removal, and cleanup costs would not be included.

Example: Insulation and Windows in the Same Year

A homeowner calculated:

• $900 of potential credit from qualifying insulation
• $600 of potential credit from qualifying windows

The combined calculation would be $1,500. However, both improvements fell within the general $1,200 annual limit, so the available credit would generally be limited to $1,200.

Separate product-specific limits also applied to windows, skylights, exterior doors, and home energy audits.

How Did Rebates Affect the Tax Credit?

A homeowner might have received a utility rebate, state incentive, manufacturer discount, or other subsidy for the same insulation project.

Whether that assistance reduced the cost used to calculate the federal credit depended on how the payment was structured and treated for federal tax purposes. In many cases, a rebate that directly reduced the purchase price also reduced the amount considered paid by the homeowner.

Simplified Example

Suppose a qualifying insulation project included:

• $4,000 in eligible material costs
• A $1,000 utility rebate that reduced the purchase price

The homeowner’s net qualifying cost might be $3,000.

$3,000 × 30% = $900 potential federal credit

This is a simplified illustration. Different rules may apply to government incentives, utility payments, state rebate programs, manufacturer rebates, and payments treated as taxable income.

Homeowners should retain all incentive documents and consult the current IRS instructions or a qualified tax professional when combining programs.

Was the Credit Refundable?

No. The Energy Efficient Home Improvement Credit was a nonrefundable personal tax credit.

A nonrefundable credit can reduce federal income-tax liability to zero, but it cannot create an additional refund beyond the amount of tax owed.

The insulation credit also could not be carried forward. Any portion that could not be used because the taxpayer lacked sufficient tax liability for that year was generally lost.

Example

A homeowner calculated a $900 insulation credit but had only $500 of eligible federal income-tax liability remaining.

The credit could generally reduce that liability by $500. The unused $400 could not be refunded or carried into a later tax year.

Withholding and estimated tax payments are not the same as total tax liability. A homeowner who expected a tax refund might still have had sufficient liability to use the credit. Tax software or a tax professional can determine the actual allowable amount.

How to Claim a Federal Insulation Tax Credit

Eligible homeowners claim the Energy Efficient Home Improvement Credit using IRS Form 5695, Residential Energy Credits.

The form is filed with the federal income-tax return for the year in which the insulation or air-sealing improvement was placed in service.

1. Confirm the Installation Year

Determine when the improvement was installed and ready for use.

A project placed in service during:

• 2023 belongs on the 2023 tax return.
• 2024 belongs on the 2024 tax return.
• 2025 belongs on the 2025 tax return.
• 2026 does not qualify under the expired credit.

The credit was not claimed solely based on the date materials were ordered or paid for.

2. Confirm the Home Qualified

Verify that the project involved an existing home in the United States that the taxpayer owned and used as a principal residence.

3. Identify Eligible Material Costs

Separate qualifying insulation and air-sealing material expenses from:

• Labor
• Removal
• Repairs
• Cleanup
• Other nonqualifying project costs

Request an itemized invoice from the installer when necessary.

4. Account for Rebates or Subsidies

Determine whether any rebate, grant, or subsidy reduced the qualifying cost.

5. Complete Form 5695

Enter the qualifying expenses in the Energy Efficient Home Improvement Credit section of the form and follow the instructions for the relevant tax year.

Insulation and air-sealing materials did not require a Qualified Manufacturer Identification Number for 2025, although some other property covered by the broader credit did.

6. Transfer the Credit to the Tax Return

Follow Form 5695 and the federal income-tax return instructions to report the allowable credit.

7. Keep Supporting Documentation

Receipts and supporting records normally are not attached to the return, but they should be retained in case the IRS requests proof.

What Records Should Homeowners Keep?

Good documentation is especially important when a contractor invoice combines materials, labor, removal, and other work.

Keep copies of:

• Purchase receipts
• Itemized contractor invoices
• Proof of payment
• Installation dates
• Product names and model information
• Manufacturer certification statements, when available
• Product packaging or specification sheets
• Installed R-values and material quantities
• Energy-audit or project-scope documents
• Rebate and incentive records
• Before-and-after photographs
• Relevant permits or inspection records
• A copy of Form 5695 and the filed tax return

The documentation should make it possible to identify which expenses were for qualifying materials and which were for nonqualifying labor or related work.

Common Insulation Tax Credit Mistakes

Claiming the Entire Contractor Invoice

Only qualifying material costs counted for insulation and air sealing. Labor and related services had to be excluded.

Using the Purchase Date Instead of the Installation Date

The credit applied for the year the improvement was placed in service, not necessarily the year it was ordered or paid for.

Claiming a 2026 Project

Under current law, improvements placed in service after December 31, 2025, do not qualify for the Energy Efficient Home Improvement Credit.

Claiming Insulation in a Rental or Second Home

For insulation and air-sealing materials, the taxpayer generally had to own and use the property as a principal residence.

Assuming Every Insulation Product Qualified

The material or system had to be new, primarily designed to reduce heat loss or gain, and meet the applicable energy-efficiency criteria.

Ignoring Other Credits Claimed During the Year

Insulation shared the general $1,200 annual credit limit with several other qualifying improvements. Claiming windows, doors, an energy audit, or certain equipment could affect the remaining available limit.

Failing to Subtract a Price-Reducing Rebate

Some rebates or subsidies reduce the cost used to calculate the credit. The treatment depends on the program.

Expecting the Unused Credit to Carry Forward

The Energy Efficient Home Improvement Credit could not be carried into a later tax year.

Can a Past Tax Return Be Amended?

A homeowner who completed a qualifying project in 2023, 2024, or 2025 but did not claim the credit may be able to file an amended return.

The IRS generally allows a taxpayer seeking a refund to amend a return within:

• Three years after the original return was filed, or
• Two years after the tax was paid,

whichever period ends later.

Different circumstances can affect this deadline. Homeowners should review the IRS amended-return guidance or consult a qualified tax professional before assuming a past claim remains available.

The applicable version of Form 5695 should match the year being amended.

What Should Homeowners Do for Projects in 2026 or Later?

The expired federal credit should not be included when budgeting for a new insulation project placed in service during 2026 or later.

Other assistance may still be available through:

• State energy offices
• Electric or natural-gas utilities
• Municipal programs
• Weatherization assistance programs
• State-administered home-energy rebate programs
• Local nonprofit programs
• Manufacturer promotions
• Income-qualified energy-efficiency programs

Program eligibility, funding, covered measures, and application procedures vary. Some programs require approval or an energy assessment before work begins.

Before installing insulation:

1. Search for current programs serving the home’s address.
2. Confirm whether preapproval is required.
3. Verify eligible insulation types and R-values.
4. Ask whether air sealing must be completed first.
5. Confirm contractor requirements.
6. Request written program terms.
7. Keep all invoices and installation records.

Federal Insulation Tax Credit FAQs