There is a sales tax on used vehicles. The amount depends on in which state you buy it. If you buy it from a private party, it's pretty common practice for the seller to put a lower price on the title transfer papers so you can save a little bit there. 6% for sales tax is a good average. 7.5% I think is the highest(California).
If you buy in Florida off a lot and put it directly on a truck bound for somewhere outside the state - you don't pay the Florida sales tax. Same in California. You have to show the sales lot the "bill of lading" for the transport out. *I've done it. Two years ago in Florida. *But, you have to pay the sales tax at the destination. *DR, for example.
I would guess if you put it on the truck at Florida or California sales lot bound for port and foreign country, it would work the same. *But you would want to check to know for sure.
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