2025 Residential Energy Tax Credits: 2026 Filing and Deadline Guide

The Inflation Reduction Act expanded the residential credits, but Public Law 119-21 ended them much earlier than the original schedule. Section 25C does not apply to property placed in service after December 31, 2025, and Section 25D does not apply to expenditures made after that date. In 2026, this page is primarily a filing and substantiation guide for qualifying 2025 projects, not a promise of a new federal credit for a 2026 installation.

Section 25C: Energy Efficient Home Improvement Credit

The §25C credit provides 30% of qualified expenses for eligible improvements to an existing U.S. home used by the taxpayer as a residence. The residence rules depend on the property: building-envelope components generally require an owned principal residence, home energy audits require a principal residence, and qualifying residential energy property such as certain HVAC, heat-pump, biomass, and electrical-panel equipment can qualify in another residence used by the taxpayer, including a second home. Annual limits apply:

• $1,200 maximum total annual credit for general improvements.

• $2,000 additional annual limit for heat pumps, heat pump water heaters, and biomass stoves.

• $3,200 combined maximum per year.

These annual limits applied through the final 2025 eligibility year. Property placed in service after December 31, 2025 does not qualify for a new Section 25C credit under current federal law.

Qualifying Improvements Under §25C

The $1,200 general improvement category includes:

• Insulation and air sealing materials: Up to 30% of cost (no per-item cap within the $1,200 annual limit).

• Energy-efficient windows and skylights: Up to $600 per year, 30% of cost.

• Energy-efficient exterior doors: Up to $250 per door, $500 total per year.

• Home energy audits: Up to $150 per year.

• Central air conditioners, furnaces, boilers, water heaters: Up to $600 per item, 30% of cost.

• Electrical panel upgrades needed for other qualifying improvements: up to $600.

The $2,000 heat pump category includes:

• Heat pumps (air-source or geothermal that doesn't qualify under §25D).

• Heat pump water heaters.

• Biomass stoves and boilers with thermal efficiency rating of at least 75%.

Equipment Eligibility Standards

Equipment must meet the statutory energy-efficiency standards for its category. Manufacturers provide certification statements documenting eligibility. For specified §25C property placed in service in 2025, the taxpayer reports the manufacturer's four-character Qualified Manufacturer Identification Number (QMID) on Form 5695.

Section 25D: Residential Clean Energy Credit

The §25D credit generally provides 30% of qualifying cost for clean energy installations on residential property. Unlike §25C, most qualifying §25D property has no annual or lifetime dollar cap; qualified fuel-cell property is subject to a separate capacity-based limit.

Qualifying Improvements Under §25D

• Solar electric (photovoltaic) systems.

• Solar water heating systems (excluding pool heating).

• Geothermal heat pumps.

• Small wind turbines.

• Fuel cells installed on or in the taxpayer's U.S. principal residence (limited to $500 for each one-half kilowatt of capacity).

• Battery storage systems with capacity of at least 3 kWh.

Accelerated Termination

The former 2032 phase-down schedule is obsolete. Section 25D does not apply to expenditures made after December 31, 2025. Contract date alone is not enough; preserve invoices, payment records, installation evidence, and utility permission-to-operate or commissioning records where relevant.

Battery Storage: A Major IRA Expansion

One of the most consequential IRA changes was extending §25D to standalone battery storage — even when not paired with solar. Previously, batteries qualified only when charged by solar. Now, a battery system installed without solar (e.g., for backup power or grid-arbitrage) qualifies for the 30% credit, provided it meets the 3 kWh minimum capacity.

This is significant for households facing increasing grid instability or those participating in time-of-use electricity rate programs.

The Credit Mechanics

Both §25C and §25D are nonrefundable credits — they reduce tax liability dollar-for-dollar but cannot generate a refund beyond zero tax owed. However:

• §25D credits can be carried forward to future years if not fully used in the year of installation.

• §25C credits are NOT carried forward — they must be used in the year incurred or lost.

Documentation and Filing

To claim the credits:

1. Retain manufacturer certification statements documenting equipment eligibility.

2. Maintain receipts and invoices showing cost breakdowns (equipment, labor, materials).

3. File Form 5695 (Residential Energy Credits) with the Form 1040.

4. Report the required four-character QMID for qualifying 2025 §25C property.

What Doesn't Qualify

• Property in a home the taxpayer does not use as a residence. A second home may qualify for certain §25C residential energy property, but not for building-envelope components or a home energy audit; a rental used only by tenants does not qualify for the taxpayer's §25C credit.

• Improvements financed via subsidized state programs may have credit reductions.

• Used or refurbished equipment (must be new).

• Equipment that doesn't meet specified energy efficiency standards.

• Labor costs are generally NOT eligible under §25C (only the equipment itself), with limited exceptions for installation of specific items.

• Labor costs ARE eligible under §25D for the qualifying clean energy installations.

Stacking With Other Incentives

Federal tax credits stack with:

• State income tax credits — many states offer additional credits for the same improvements.

• State and local rebates — direct cash incentives that may reduce the cost basis used for federal credit calculation.

• Utility company rebates — typically reduce the basis.

• Inflation Reduction Act point-of-sale rebates for low- and moderate-income households (separate program from credits, administered by states).

The interaction between these incentives requires careful tracking. Generally, rebates reduce the cost on which the federal credit is calculated, but state credits do not.

2026 Filing Checklist for 2025 Projects

• Confirm the property was placed in service, or the qualifying Section 25D expenditure was made, no later than December 31, 2025.

• Reconcile invoices between equipment and labor because eligible labor treatment differs by property type.

• Retain manufacturer certifications, the four-character QMID when required, payment records, and rebate documentation.

• Complete Form 5695 and track any allowable Section 25D carryforward.

Solar Plus Storage Strategy

For a qualifying 2025 solar and battery project, eligible costs may fall under Section 25D and unused credit may be carried forward subject to the statutory rules. For property first paid for or installed in 2026, do not assume the former federal credit remains available; evaluate state, local, and utility incentives separately.

Coordination With Home Sale

Qualifying energy-improvement costs generally increase the home's basis, but the increase is reduced by any residential energy credit allowed for the expenditure. The resulting net basis adjustment can reduce gain on an eventual sale; the separate §121 exclusion and its eligibility rules still apply.

EV Charging Equipment

Home EV charging equipment may qualify for the separate Alternative Fuel Vehicle Refueling Property Credit (§30C) when the location and other requirements are met. Under current law, Section 30C does not apply to property placed in service after June 30, 2026.

Common Mistakes

• Applying one residence rule to every §25C category instead of distinguishing building-envelope components and audits from qualifying residential energy property.

• Failing to retain manufacturer certifications or report the required QMID.

• Reducing basis incorrectly when state rebates are received.

• Missing the carryforward of §25D credits when tax liability is insufficient in year 1.

• Assuming the former multi-year Section 25C strategy continues for property placed in service after 2025.

• Including labor costs for §25C improvements where labor is not eligible.

• Missing the EV charger credit (§30C) when installing home charging.

Bottom Line

Sections 25C and 25D ended for new post-2025 activity under current law. Taxpayers filing 2025 claims should focus on eligibility, the correct statutory date, Form 5695, manufacturer documentation, cost allocation, rebates, and any Section 25D carryforward. A 2026 project should be modeled without those federal residential credits unless later law changes.

Official source: Review the IRS OBBB energy-credit FAQ for the accelerated termination dates and transition questions.