I certify that, to the best of my knowledge, the title is. Buyers have 60 days to title and register their new vehicles in Utah.A Utah Bill of Sale acts as a legal record for the transfer of property. It's mandatory in Utah to transfer vehicle ownership. A Utah vehicle bill of sale is not required to register a vehicle, but it works well with a car title to legalize the transfer of ownership. A Utah motor vehicle bill of sale, known as Form TC-843, is an official document that provides proof that a vehicle has been sold in the State of Utah. 1. Obtain the Utah State Motor Vehicle Bill of Sale form. The buyer will take the Application for Duplicate Utah title to a DMV office along with the bill of sale to register the vehicle. The buyer must keep an original copy of the document, and the seller must sign over any title or ownership to the new owner.