Independent coverage of Illinois housing, remodeling & residential developmentSaturday, November 7, 2026
Illinois Remodeling & Development Network

Illinois home energy programs

Federal §25C Energy Efficient Home Improvement Credit

This is the page most likely to contradict what a contractor or a home-improvement retailer tells you in 2026. The §25C credit existed, it was useful, and under current law it does not apply to new installations — no matter what the marketing says about 2032.

Closed for new 2026 work

Under current IRS guidance this credit does not apply to property placed in service after December 31, 2025. Ask a tax professional about your specific filing.

Administered by Internal Revenue Service. Last reviewed November 6, 2026.

Independent guidance — Illinois RDN is not a government agency and does not administer these programs.

At a glance

Status
Not allowed for property placed in service after Dec 31, 2025
Previously covered
Insulation, qualifying HVAC, windows, doors, electrical panel work
Common misinformation
"Available through 2032" — that described prior law
What to do
Verify against IRS guidance, not a sales sheet

Who it is for

  • The credit applied to qualifying improvements to an existing principal residence, subject to the rules in effect for the year of installation.
  • For 2026 installations, current IRS guidance does not allow the credit because the property is placed in service after the cutoff.
  • Questions about a prior-year claim, an amended return or a carryforward belong with the IRS guidance and a qualified tax professional.

What it covers

  • Historically: insulation and air sealing, qualifying heat pumps and HVAC equipment, water heaters, windows and doors, and electrical panel upgrades, each with its own cap.
  • Not currently: any of the above installed in 2026 for the purpose of claiming this credit.

How to apply

  1. 01
    Check the date that matters

    The test is when the property was placed in service, not when you signed a contract or paid a deposit.

  2. 02
    Read the current IRS pages

    Use IRS.gov rather than a contractor's summary or a retailer's promotional page.

  3. 03
    Ask about prior-year work

    If you installed qualifying equipment in an earlier year and did not claim it, ask a tax professional whether an amendment is available.

  4. 04
    Do not buy on the promise of a credit

    If a 2026 quote assumes this credit, ask for the calculation in writing and verify it independently before signing.

What to have ready

  • Manufacturer certification statements for any equipment you installed in a qualifying prior year.
  • Invoices showing installation dates.
  • Your prior-year return, if you are asking a preparer about an amendment.

Where homeowners get stuck

  • Relying on "available through 2032" language that reflects prior law.
  • Assuming a deposit date controls instead of the placed-in-service date.
  • Treating a retailer's marketing as tax guidance.
  • Missing a legitimate prior-year claim because you assumed the window had closed long ago.

How it combines with other programs

Utility rebates are unaffected by the status of this federal credit and remain available. Rebates reduce the cost; a credit reduces tax owed — they were never the same mechanism.

Official links

Questions homeowners ask

Can I claim the credit for work done in 2026?

Under current IRS guidance, no — the credit is not allowed for property placed in service after December 31, 2025. Confirm with the IRS or a tax professional for your circumstances.

What about work I did in 2025 and did not claim?

That may still be claimable depending on your filing situation. Ask a qualified tax professional about a prior-year claim or amendment.

Why do contractors still quote it?

Often because the quote template predates the law change, or because they are repeating older marketing. Ask them to show you the current IRS position.

Does this affect utility rebates?

No. Utility efficiency rebates are separate programs with their own rules and remain available where offered.

Federal §25D solar creditComEd rebatesAll Illinois energy programs

Other Illinois energy programs

Sources

Illinois data behind this guide