The federal solar tax credit can't take your tax liability below zero, but any remaining portion can be rolled over to later tax years until it's exhausted. Giv

The federal solar tax credit can't take your tax liability below zero, but any remaining portion can be rolled over to later tax years until it's exhausted. Given this, I think a situation where someone couldn't meaningfully benefit from the credit would be very unusual. You'd have to have an effective tax rate of zero for years at a time.