I do not want to advise anyone on their taxes. My guess is a solar tax credit acts like the child tax credit, as they are both credits, but that is only a guess.Interesting. I had a credit of around 1800$ last year from federal but still received the full tax credit for both of my kids (total credit of 8500$ or so after child credits). Does the solar credit work similarly? Just go on top of that even though I already have credit just from over payment, not including any credits?
Overpayment has nothing to do with the calculation. Overpayment means you gave the tax man a free loan.
I think it is better if I stop talking about taxes now. I ain't no tax accountant and do not want to mislead anyone.