In this situation, both you the buyer and the seller must complete the Statement of Transaction {Sales Tax Form} at NY State Department of Tax and Finance DTF-802. Then you will bring the form to a DMV office where they will calculate and collect the sales tax, and also issue a sales tax receipt.
What other documents do I need to bring if I bought a car from a NY car dealer?
In that case bring the dealer 's bill of sale that shows that you paid NY State sales tax.
Are there any other tax payments involved when I register this car?