IRC 25C and 25D Residential Energy Credits: OBBBA December 31, 2025 Termination and TY2025 Transition Guide

For tax practitioners filing TY2025 individual returns, the OBBBA termination of IRC 25C and IRC 25D creates a sharp transition question in every energy improvement engagement: was the property installed and operational in the client's home by December 31, 2025? If yes, the credit may be available on the TY2025 return. If no, no federal residential energy credit applies. The termination is enacted law. The transition rule is unforgiving: a solar system contracted in 2025 but installed in 2026 does not qualify, regardless of when the deposit was paid or the permit was pulled.

This guide is written for enrolled agents, CPAs, and tax attorneys preparing TY2025 individual returns for clients who made residential energy improvements. It covers the pre-OBBBA credit landscape, the enacted OBBBA termination, TY2025 credit amounts (hedged to statute and Form 5695 instructions), the placed-in-service rule and its practical scenarios, documentation requirements, the distinction between terminated residential credits and continuing commercial credits, and state credit considerations. All statutory citations and IRS guidance must be verified against the enacted OBBBA text, the current Form 5695 instructions, and current IRS.gov resources before reliance in any specific client matter. This guide is for informational purposes only and does not constitute legal or tax advice.

Section 1: Pre-OBBBA Background -- IRC 25C and IRC 25D Under the Inflation Reduction Act

IRC 25C: Energy Efficient Home Improvement Credit

IRC 25C has a long history as a residential energy credit, but its current, substantially enhanced form was established by the Inflation Reduction Act of 2022 (IRA). The IRA restructured IRC 25C from a lifetime cap credit into an annual credit with per-category caps, allowing taxpayers to claim the credit in multiple tax years for different qualifying improvements.

Under IRC 25C as in effect before OBBBA, qualifying property included:

• Building envelope components: Exterior windows, skylights, exterior doors, and insulation and air sealing materials (subject to applicable energy efficiency standards).
• Heating and cooling systems: Heat pumps, heat pump water heaters, central air conditioners, furnaces, and boilers (subject to applicable efficiency standards).
• Biomass stoves and boilers: Qualifying biomass-fueled property used to heat the taxpayer's home or water.
• Electrical upgrades: Electrical panel upgrades and related wiring improvements meeting applicable standards.
• Home energy audits: The cost of a qualified home energy audit conducted by a certified auditor at the taxpayer's principal residence.

The IRA extended IRC 25C availability through December 31, 2032, with the annual per-category cap structure. OBBBA overrode that extension by enacting a hard termination on December 31, 2025.

IRC 25D: Residential Clean Energy Credit

IRC 25D provides a credit for the installation of clean energy property at the taxpayer's principal residence (and, for some property types, a second home). Unlike IRC 25C, IRC 25D has no annual dollar cap; the credit applies as a percentage of the total qualifying installation costs. The IRA substantially expanded IRC 25D and extended it through 2032, with a phase-down of the credit rate beginning in 2033 (dropping from 30% to 26% in 2033 and 22% in 2034). OBBBA eliminated this schedule entirely by terminating IRC 25D after December 31, 2025.

Under IRC 25D as in effect before OBBBA, qualifying property included:

• Solar photovoltaic (PV) panels: Solar electric property installed at the taxpayer's residence to generate electricity.
• Solar water heating property: Equipment used to heat water for use in the taxpayer's residence (at least 50% of the energy used must be derived from the sun).
• Geothermal heat pump property: Equipment using geothermal energy to heat and cool the taxpayer's home, meeting applicable energy efficiency requirements.
• Small wind turbines: Wind energy property generating electricity for the taxpayer's residence.
• Battery storage technology: Standalone battery storage systems placed in service at the taxpayer's residence (a separate IRC 25D category added by the IRA, applicable to property placed in service after December 31, 2022).

The scope of qualifying property for each category and the applicable energy efficiency standards must be verified against IRC 25D as in effect for TY2025 and the current Form 5695 instructions at IRS.gov. Standards and IRS guidance have evolved over the period these credits were in effect, and IRS Fact Sheet FS-2025-05 (issued August 21, 2025) addresses certain implementation details specific to TY2025.

Section 2: OBBBA Termination -- Enacted Law, December 31, 2025

OBBBA amended IRC 25C and IRC 25D to terminate both credits for property placed in service after December 31, 2025. This is enacted law. No hedge is required on the termination date itself; it is not a proposed rule, a phase-down, or a pending legislative change. The termination is in effect.

The OBBBA termination reversed the IRA's 2032 extended availability for both credits. Prior to OBBBA, both IRC 25C and IRC 25D were scheduled to remain available through December 31, 2032 (with IRC 25D subject to a rate phase-down beginning in 2033). OBBBA superseded that schedule by enacting an earlier hard stop. The statutory mechanism was an amendment to the applicable credit provisions eliminating the availability of the credit for property placed in service after December 31, 2025.

IRS Fact Sheet FS-2025-05 (issued August 21, 2025) addresses the OBBBA termination of IRC 25C and IRC 25D, confirms the December 31, 2025 placed-in-service deadline, and provides IRS implementation guidance for TY2025 returns. Practitioners should verify all credit mechanics against FS-2025-05, the enacted OBBBA text, and current IRS.gov guidance.

Section 3: TY2025 Credit Amounts (Hedge to Statute and Form 5695 Instructions)

For TY2025 returns, the credits are claimed under IRC 25C and IRC 25D as in effect for TY2025. All credit amounts stated below are hedged to the applicable IRC provisions and to the current Form 5695 instructions; practitioners must verify all amounts and caps against IRS.gov and the TY2025 Form 5695 instructions before completing any return. The annual caps for IRC 25C are subject to statutory limits that may differ from what this guide describes in general terms.

IRC 25C Credit Amounts for TY2025

Under IRC 25C as in effect for TY2025 (verify at IRS.gov and Form 5695 instructions):

• General credit rate: 30% of the cost of eligible improvements, subject to the annual per-category caps described below. Verify the applicable rate against IRC 25C as in effect for TY2025 and the current Form 5695 instructions.
• Annual cap (general): The annual overall cap limits the total IRC 25C credit a taxpayer may claim in a single tax year, regardless of how many qualifying improvements were made. The current annual cap must be verified at IRS.gov and in the TY2025 Form 5695 instructions; no specific dollar amount is stated in this guide without that verification step.
• Heat pump and biomass stove cap: A higher annual cap applies specifically to heat pumps and biomass stoves and boilers. Verify the current amount against IRC 25C as in effect for TY2025 and the Form 5695 instructions.
• Window cap: A separate, lower per-category cap applies to exterior windows and skylights. Verify the current cap at IRS.gov and in the Form 5695 instructions.
• Home energy audit credit: A credit is available for the cost of a qualified home energy audit at the taxpayer's principal residence, subject to its own cap. Verify the applicable amount at IRS.gov and in the Form 5695 instructions.

The per-category cap structure under the post-IRA IRC 25C is an important planning consideration for TY2025 practitioners: a taxpayer who made multiple qualifying improvements in 2025 may hit the overall annual cap even if individual improvement costs are modest. The allocation across categories should be confirmed against the Form 5695 instructions, which govern how to compute and allocate the credit when multiple improvements are claimed in the same year.

IRC 25D Credit Amounts for TY2025

Under IRC 25D as in effect for TY2025 (verify at IRS.gov and Form 5695 instructions):

• Credit rate: 30% of qualifying costs for eligible property placed in service in 2025. Verify the applicable rate against IRC 25D as in effect for TY2025 and the current Form 5695 instructions; no specific dollar credit amount is stated in this guide without that verification step.
• No annual cap: Unlike IRC 25C, IRC 25D does not impose an annual dollar cap on the total credit amount. The 30% rate applies to the full qualifying cost of the eligible property. The absence of a cap makes IRC 25D particularly significant for large solar PV installations and geothermal systems, where qualifying costs can be substantial.
• Carryforward: If the IRC 25D credit exceeds the taxpayer's tax liability for TY2025, the excess may carry forward to subsequent tax years. Verify carryforward mechanics against IRC 25D as in effect for TY2025 and the current Form 5695 instructions.

Section 4: The Placed-in-Service Rule -- The Critical Transition Question

For every TY2025 return and every 2026 advisory engagement involving an energy improvement, the threshold question is whether the property was placed in service by December 31, 2025. Getting this right is more consequential now than in any prior year, because a property placed in service even one day after December 31, 2025 generates zero federal credit under current law.

What "Placed in Service" Means

Property is placed in service when it is installed and operational in the taxpayer's principal residence. The standard requires both installation (physical completion) and operational readiness (the system or component is functional and ready for use). Verify the precise definition of "placed in service" for residential energy credit purposes against applicable Treasury regulations and IRS.gov, particularly for non-standard or multi-phase installations.

The following dates are NOT the placed-in-service date:

• The date the purchase contract is signed.
• The date a deposit or down payment is made.
• The date a permit is applied for or issued.
• The date materials are delivered to the home.
• The date a utility inspection or interconnection agreement is submitted.

The placed-in-service date is the date the installed property is complete and operational. For a solar PV system, this is typically the date the system passes final inspection and is energized (able to generate electricity), not the date panels were mounted on the roof. Practitioners should collect documentation confirming that date, as discussed in Section 5.

Common Practitioner Scenarios

The following table covers the most common fact patterns practitioners encounter when preparing TY2025 returns and advising clients in 2026. Edge cases involving partial construction or multi-phase installations require client-specific analysis hedged to applicable Treasury regulations and IRS.gov guidance.

Section 5: Documentation Practitioners Should Collect for TY2025 Returns

For every TY2025 return on which IRC 25C or IRC 25D is claimed, practitioners should assemble a complete documentation file before the return is filed. Given the OBBBA termination, the risk of an erroneous credit claim is greater than in prior years: a 2026 installation claimed on a TY2025 return is not just an error, it is a credit that does not exist under current law.

Core Documentation

• Installer invoice confirming the date of installation. The invoice must reflect the date the installation was completed, not the contract date, purchase date, permit date, or order date. For solar PV systems, the installation completion date should reflect when the system was energized and operational, not when hardware was delivered or mounted. If the invoice does not clearly state a 2025 installation date, request supplemental documentation from the installer (such as a completion certificate, energization confirmation from the utility, or inspection sign-off).
• Manufacturer's certification (IRC 25C property). For property claimed under IRC 25C, a manufacturer's certification that the product meets the applicable energy efficiency requirements is generally required. Verify the specific certification requirements against IRS.gov and IRS Fact Sheet FS-2025-05. The types of certification required vary by product category (for example, windows and doors have different certification standards from heat pumps). Hedge the specific documentation requirements to IRS.gov and FS-2025-05; the IRS has updated guidance on certification requirements under the IRA-era IRC 25C rules.
• Form 5695 certification (taxpayer). The taxpayer certifies on Form 5695 that the property was placed in service in TY2025 at their principal residence. Practitioners should confirm this certification is accurate before the return is filed; the installer invoice and any other installation documentation should support the 2025 placed-in-service date before the taxpayer signs the return.
• Principal residence documentation (if in question). Both IRC 25C and IRC 25D require the property to be placed in service at the taxpayer's principal residence (IRC 25D also allows certain credit categories for a second home; verify at IRS.gov). If there is any ambiguity about whether the improved property is the taxpayer's principal residence, confirm the residence status with appropriate supporting documentation before claiming the credit.

Section 6: Distinguishing Commercial Energy Credits (IRC 48C, 45Y, 48E) -- Not Terminated

The OBBBA termination of IRC 25C and IRC 25D applies exclusively to the residential energy credits. Commercial and industrial energy credits are separate provisions of the IRC and were not terminated by OBBBA. Practitioners who advise business clients on energy investments, or who receive inquiries from clients about commercial energy property, should make this distinction clearly in every client communication.

Commercial Credits That Continue Under Current Law

• IRC 48C (Qualifying Advanced Energy Project Credit). IRC 48C provides a credit for investment in qualifying advanced energy projects, including manufacturing facilities for clean energy components and other qualifying industrial facilities. IRC 48C was not terminated by OBBBA and continues under current law. This credit applies to commercial and industrial property, not residential property. Verify current IRC 48C eligibility, application procedures, and credit amounts at IRS.gov; IRC 48C involves an allocation process administered by the IRS and the Department of Energy.
• IRC 45Y (Clean Electricity Production Tax Credit). IRC 45Y is a technology-neutral production tax credit for clean electricity generated by qualifying commercial facilities after 2024. It applies to commercial wind, solar, geothermal, and other clean electricity generation projects. IRC 45Y was not terminated by OBBBA and continues under current law.
• IRC 48E (Clean Electricity Investment Tax Credit). IRC 48E is a technology-neutral investment tax credit for qualifying clean electricity generating facilities placed in service after 2024. It applies to commercial clean energy installations. IRC 48E was not terminated by OBBBA and continues under current law. OBBBA enacted provisions affecting the phase-out mechanics of IRC 45Y and IRC 48E; verify current phase-out rules at IRS.gov.

The demarcation is straightforward: IRC 25C and IRC 25D are the residential credits, aimed at individual homeowners making improvements to their principal residences. IRC 48C, IRC 45Y, and IRC 48E are commercial and industrial credits, aimed at businesses investing in qualifying energy property and clean electricity generation. A client who cannot claim a federal residential energy credit because their solar system was installed in January 2026 may still have commercial credit opportunities if they own qualifying commercial energy property through a business -- but that analysis is entirely separate from the IRC 25C and IRC 25D residential credit analysis.

Section 7: State Residential Energy Credit Programs

Some states maintain their own residential energy credit or rebate programs that operate independently from the federal IRC 25C and IRC 25D credits. Because these programs are established under state law, the OBBBA federal termination does not automatically terminate them. A client who installed energy property in 2026 and therefore cannot claim a federal residential energy credit may still qualify for a credit or incentive under their state's program.

State residential energy programs vary significantly in structure, eligible property types, credit rates, income limits, and availability. Some states mirror federal eligibility rules; others have independent definitions that may be broader or narrower than the federal categories. State programs may be structured as income tax credits, direct rebates, sales tax exemptions, or property tax incentives, depending on the state.

All state credit mechanics, eligible property requirements, credit amounts, and application procedures must be verified against the applicable state statute and the state's revenue department or public utilities commission guidance. No specific state credit amounts are stated in this guide; state programs change, and amounts and eligibility rules may differ from year to year. Practitioners advising clients about 2026 energy improvements should check the specific state's current program rules before advising a client that no credit is available at the state level.

Section 8: 2026 and Beyond -- No Federal Residential Energy Credit Under Current Law

No federal residential energy credit is available for property placed in service after December 31, 2025 under current law. This applies to all property types that were formerly qualifying under IRC 25C and IRC 25D: windows, doors, insulation, heat pumps, furnaces, biomass stoves, electrical panels, energy audits (IRC 25C), solar PV panels, solar water heaters, geothermal heat pumps, small wind turbines, and battery storage (IRC 25D). None of these improvements generate a federal residential energy credit for property installed after December 31, 2025.

This point requires clear and direct communication with clients in 2026. Clients who contracted for energy improvements in 2025 with the expectation of claiming a federal credit, but whose installations were completed in 2026, have no federal residential energy credit available. Practitioners should confirm this with clients before any expectation of a credit appears on an estimated tax calculation or in a financial plan.

Whether Congress may reinstate or replace the residential energy credits in future legislation is a question of legislative forecasting, not current law. As of the date of this guide, no such reinstatement has been enacted. Advise clients based on current law.

Frequently Asked Questions

Common questions from enrolled agents, CPAs, and tax attorneys on IRC 25C, IRC 25D, and the OBBBA termination.

Related Practitioner Guides

The following guides cover related OBBBA provisions and tax rules that practitioners should consider alongside the IRC 25C and IRC 25D residential energy credit termination analysis.

• IRC 48C and 45X Advanced Manufacturing Credit Guide -- covers the commercial energy credits that continue after 2025: the IRC 48C Qualifying Advanced Energy Project Credit and the IRC 45X advanced manufacturing production credit. Practitioners advising commercial clients should review these continuing credits to distinguish them from the terminated residential credits under IRC 25C and IRC 25D.
• IRC 168(k) Bonus Depreciation and IRC 168(n) Qualified Production Property Guide -- covers depreciation incentives for commercial and production property under OBBBA. Provides useful context on how OBBBA structured incentives for commercial investment alongside the termination of residential credits, helping practitioners distinguish the residential and commercial incentive landscapes for client communications.

Tax Software Built for TY2025 Individual Returns

Americas Tax has supported enrolled agents, CPAs, and tax attorneys handling individual returns, residential credits, and OBBBA transition issues since 2001. Our team understands the Form 5695 workflow, the placed-in-service documentation requirements, and the distinctions between terminated residential credits and continuing commercial energy credits that practitioners face in TY2025 and 2026.