The federal EV credit is non-refundable, which means the credit can't reduce your tax liability past zero. The maximum credit is $7,500. It is nonrefundable, so you can't get back more on the credit than you owe in taxes. You can't apply any excess credit to future tax years. Did you have a federal tax liability on Form 1040? (see lines 18 and 24).
California has a rebate incentive; you can find out more about the program by visiting the CA - CVRP website.
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