Hello @VVB! Thank you for your question.
As you may already know, the federal tax credit for residential solar energy for 2022 is 26% of the total cost of the solar panels. This credit is a non-refundable tax credit, which means it can only be used for taxes that you owe. You cannot use the credit to get money back from the IRS. If you do not utilize the entire credit in 2022, you can carry the credit forward and use the balance in future years. While you can adjust your federal withholding at any time with your employer, there is no need to do so to take full advantage of the credit because you can carryforward any unused credit amount to future years.
Here is a helpful article about the federal tax credit for residential solar energy: https://turbotax.intuit.com/tax-tips/going-green/federal-tax-credit-for-solar-energy/L7s9ZiB4D
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