It depends, if your tax due on your 1040 is more than your solar credit; the remaining solar credit will carryover to next year, if applicable. If you have 15,000 in solar credit available and only using 10,000 this year, 5,000 will carry over to next year because again, taxes due weren't enough to take full credit, if applicable. It is a credit against taxes due, not a refundable credit. However, if you paid taxes due/or had taxes taken from your job and have a tax due, the credit will work with it and increase your refund based on taxes paid for the year; and in some cases cutting the tax due bringing up to all you paid in taxes back to you.
@jempim
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