State tax filing

Thank you for responding! Could you expand your answer so that I can understand and implement it? Particularly, "You can refigure the 2020 credits and add the difference on 2021 return" is not clear to me. I know the tax credit i calculated and received for 2020 based on the cost of the system, and I know the amount i received as rebate from electrical company in 2021. Could you kindly be explicit about how i should refigure for my 2021 return?  I apologize for my lack of knowledge about taxes.