I found it impossible for myself to claim the charger credit the same year as the vehicle credit. This happened to me twice. As Rick says it uses AMT and calculates a tentative minimum tax value you must satisfy. When claiming the $7500 tax credit for the vehicle even with excess tax liability it seems to make this tentative minimum tax calculation fail. My wife and I filed separately for other reasons and she claimed the charger credit on hers and it worked. I gave her $100 of itI am trying to enter the information for my charger installation on TurboTax and it is showing I get no credit for this. Anyone have any issues with this or know why it is not giving me the 30% credit?