Proof of ownership normally includes a bill of sale. The DMV does not provide a form for a bill of sale.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. It documents information about the buyer, seller, and vehicle that is necessary for registration and titling. It does also require notarization. The new owner must give the original bill of sale to the DMV along with the other required proofs of ownership when they title and register the vehicle. Find out more on a New York bill of sale and how to fill it out. Use a free template or try out our step-by-step creator for customized options. Many states don't mandate notarization for bills of sale.