Yes, you can carry forward unused portions of the residential solar tax credit to 2026 and future years, provided your solar energy system was installed and placed in service by the deadline of December 31, 2025.
The tax code allows you to carry forward any excess, unused credit to future tax years until you have claimed the full amount. The IRS has not announced an expiration date for carrying forward the credit, so it is generally considered to be indefinite for qualifying installations.
