If the title lists "John Doe or Jane Doe," only one must sign. No notary is needed to sign off on a title.□ Not included with the vehicle sale. In many cases, you are not legally obligated to notarize a bill of sale. Does a bill of sale have to be notarized in Utah? No. A vehicle bill of sale for a private party transfer does not need to be notarized. Certificate of Title – The seller must provide you either the original certificate of title or a completed Form TC-123, Application for Duplicate Utah Title. Do I need a notary public to sign the Utah bill of sale? Action: Both the seller and the buyer must sign and date the form. Depending on the item being sold, witness signatures or notarization may be required.