believe the popo has to verify the vin on some form before you can tag, had to do this on a motorcycle. Unless it is currently tagged, you will have tavt tax to pay
the tag has nothing to do with the tavt.
The tavt is a sales tax that has been renamed.
It's for the title transfer, that used to be 18.00.
Now it's 6.5% of the purchase price, or (if you let them) whatever the state values the vehicle.
If you have the purchase price on your bos, you might have to get ugly and file appeals, but they will usually come around, or you can just roll over and give whatever they take from you.
I haven't purchased anything lately that didn't require a tag, but the bos can save you a lot of money, if you are buying a fixer upper.