: Missouri and Illinois have reciprocity agreements. Usually, you should not be charged Illinois sales tax at the dealership .
: If the dealer incorrectly collects Illinois tax, you will receive credit for that amount toward your Missouri tax bill, but you will still have to pay any difference if Missouri's rate is higher .
: Tell the Illinois dealer upfront that you are a Missouri resident registering the car in Missouri .
If you live in Missouri and buy a car in Illinois, you will primarily handle taxes and registration in your home state of Missouri . Sales Tax and Reciprocity
