The buyer and seller's signatures make the document legally binding. Simpler, smarter, safer.Secure your transaction with our notarized bill of sale template. This blog post is tailored to help you understand how to draft, why it's necessary, and where you can obtain a Texas bill of sale. For notaries commissioned or recommissioned on and after January 1, 2016, the seal must also contain the notary public's Secretary of State ID number. Some of the information provided on the form is about the seller, the buyer, and the property being sold. This form will require notarization. A notarized bill of sale protects your interest and will make the transaction official. The document makes the ownership more secure.