https://turbotax.intuit.com/tax-tips/going-green/federal-tax-credit-for-solar-energy/L7s9ZiB4D
Filing requirements for the solar tax credit
To claim the credit, you must file IRS Form 5695 as part of your tax return. You'll calculate the credit on Part I of the form, and then enter the result on your 1040.
- If in 2021 you end up with a bigger credit than you have income tax due — a $3,000 credit on a $2,500 tax bill, for instance—you can't use the credit to get money back from the IRS. Instead, you can carry the credit over to tax year 2022.
- If you failed to claim the credit in a previous year, you can file an amended return.
