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. 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. The notarial act required most often on motor vehicle forms is the verification on oath or affirmation. 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. This document will require notarization and may be required for registration.