In 2025, you begin a home energy improvement project, but you fail to complete it by New Year's Day; you might be in for a big surprise. The tax credits that brought the cost of solar panels, heat pumps, and energy-saving windows down to pocket-money prices have been changed greatly, and they have vanished anyway in the eyes of many a homeowner.
The phaseout of a number of Inflation Reduction Act incentives was quickened because of the One Big Beautiful Bill Act (OBBBA). In the case of homeowners of residential houses, the clock expired on December 31, 2025. Before facing IRS payroll tax audit, make sure to consult with an expert in this field.
The most important concept that would be well received is the "placed in service" requirement. The law of taxation is indifferent to the time you entered into the contract, the time you paid the deposit, or even the time when the equipment reached your home. It is just interested in the date when the system is installed, fully operational, and is ready to be used.
Projects built in 2026 will no longer have two major residential credits:
This 30-percent credit that has no dollar limit on solar panels, solar water heaters, geothermal heat pumps, wind turbines, and battery storage technology expired on December 31, 2025. This means that you cannot claim the credit should you have placed your solar panels in service after that date.
This 30-credit (up to 1200/year) applies to windows, doors, insulation, and some HVAC equipment, and also expires on December 31, 2025. Certain enhancements, such as heat pumps and biomass stoves, which are more capped, are also covered by this deadline.
Just remain in a painful yet common situation: In October 2025, you had signed a contract to install a solar of 30,000 dollars. The installer promised to do it by Thanksgiving. Consult with an expert (like a sales tax attorney) who can help you tackle difficult tax situations.
With the old regulations, a tax credit of 9000 was to be expected. Under the new rules? You get zero. The Section 25D credit is not available due to the fact that the system was put in service later than the deadline of December 31, 2025.
It is not a theoretical edge case. The clean energy sector has warned that delays in the installation process would result in thousands of projects missing the eligibility deadline, forcing homeowners to pay the entire bill and receive no tax credit.

Although the residential credits have lapsed, there are still some commercial opportunities--but they too have their close deadlines.
Commercial Solar and Wind: In order to receive the Investment Tax Credit (ITC), commercial solar projects should start construction by July 4, 2026, and be put into service within four years.
Nonetheless, the IRS has narrowed down the regulations of beginning of construction. The 5 per cent safe harbor test has been abolished in most projects; now you are required to show that you have done something of a physical character of substantial nature.
When you have a deadline to meet or even a project to do in 2026, then the following measures can be implemented:
1. Assuming you did work at the end of 2025, verify the exact date of being placed in service with your contractor.
2. In 2025 tax returns (filed in 2026), note that now heat pumps, central air conditioners, and some windows must have a qualified product identification number on your return. Make sure that this number was given by your manufacturer.
3. With federal residential credits dead, state rebates, utility credits, and local property tax exemptions become much more important. Investigate what the state provides to close the divide.
4. In the case of You Are Building New, Builders are still eligible to claim the Section 45L New Energy Efficient Home Credit, although on homes purchased before June 30, 2026, only. You have to make sure that your closing date is before the deadline, in case of purchasing a newly built home this summer.
The lapse of time of Sections 25C and 25D will be the genocide of residential clean energy incentives. To homeowners, it is a bitter and yet simple lesson; it is a tax credit world, and a project that is almost completed is just the same thing as one that is not.
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