As the December 31, 2025, deadline for the 30% Residential Solar Tax Credit approaches, homeowners are seeking clarity on what qualifies for the incentive. The tax credit, under Section 25D, will no longer be available after this date.
There is a common misconception that signing a contract or making a payment before the deadline is enough to qualify for the credit. However, according to IRS guidance: “An expenditure with respect to an item is treated as made when the original installation of the item is completed.” This means that only solar systems that are installed and operational by December 31, 2025, will be eligible for the tax credit.
In practical terms, “installed” refers to a system that is fully built, wired, and capable of operating. While utility approval known as “Permission to Operate” may occur after installation, it does not affect eligibility as long as installation is complete before the deadline.
The IRS guidance also clarifies that contracts or payments made without a completed installation do not qualify for the credit. The same rule applies regardless of whether homeowners pay in cash or finance their system through a loan. Many solar loans expect borrowers to use their tax credit for early principal payments; lenders may adjust their products as the deadline nears if installations risk slipping into 2026.
Battery systems are subject to identical requirements: they must be installed and operational by December 31, 2025, whether paired with solar panels or installed independently.
If a project finishes in December 2025 but payment extends into the following year, homeowners can still claim the full 30% credit on their 2025 tax return because eligibility depends on completion of installation rather than final payment date.
Homeowners are advised to work with reputable installers who provide clear timelines and have sufficient workforce capacity. Scheduling should be realistic given expected high demand near year-end. Consulting with a tax professional about individual circumstances is also recommended.
The IRS reiterates: “An expenditure shall be treated as made when the original installation of the item is completed.” — IRS, Section 25D(e)(8)(A)
Kokosing Solar has served Ohio residents and businesses for over two decades. The company reports its schedule for 2025 installations is already full and it is now helping customers plan for projects in 2026.
