If you will not get the car until 2023 then you can ONLY use the EV credit on the 2023 return. If you put in solar in 2022 then you will use the solar credit on the 2022 return. Any excess credit you cannot use in 2022 carries to 2023. Then in 2023 the EV credit is used FIRST then if you still have some tax liability left you can use the solar credit. If you have any unused solar credit then it again carries forward to 2024.
