The seller's signature is required to be notarized or verified on the Pennsylvania title. Both parties do not have to be present at a notary even if both are PA residents.You want a signed title and a bill of sale with the seller's contact info. For most private vehicle sales between individuals, a bill of sale does not need to be notarized to be considered legally valid and binding. The process of transferring a car title typically requires both the buyer and the seller to be present at a notary or an authorized PennDOT agent. Does a bill of sale have to be notarized in Pennsylvania? No. A vehicle bill of sale for a private party transfer does not need to be notarized. The seller's signature may require notarization on some out-of-state titles. This document will require notarization and may be required for registration. In Pennsylvania, notarization is generally not required for the Bill of Sale, but it can provide added protection for both parties.