NY doesn't require you to sign in front of a notary. While a bill of sale is generally valid without notarization, there are situations where it becomes a wise precaution.The answer generally is "no" Notary commissions are not transferable between states. How to submit this form: Submit this form along with required documents and applicable tax to the county tag office in the county where the primary purchaser. Proof of sale, such as a Bill of Sale (Form T-7). Transfer Ownership of Your Vehicle. After sale of the vehicle, the law requires that the plaintiff file a Disposition of the proceeds and a copy of the bill of sale.