you typically have to owe federal tax to utilize these type credits (they are usually not refundable credits) however, most unused credits will carry over for years so even if they are not used in 2021, they will be available in the future. I have not had a single person use this credit yet, few ev credits over last few years. We are behind the times here in North Georgia.....is this credit similar to EV credit where you have to own federal tax to completely utilize the credit?