While a bill of sale is generally valid without notarization, there are situations where it becomes a wise precaution. While notarization might not always be mandatory, it can significantly enhance the legal and evidentiary value of your bill of sale.Six states actually require that a bill of sale be notarized before it can be used to transfer the title of a vehicle. A notary is no longer required to transfer title To a vehicle in the State of Texas. Forms and instructions are on the Texas DMV website. Signature of Seller. Most states in the US do not require a notary or public official to witness and authenticate the signing of a bill of sale. Notarization is not required for the Bill of Sale in New York, but it can provide additional legal protection. You can get a notarized bill of sale template from a legal or business website. To get started, download the form or template and fill it out.