Chapter 1: General Registration Information. This form below is designed for use on upon the sale of a boat or vessel.Such a bill of sale is needed to confirm a party's ownership in the boat. Boats are taxable and subject to annual appraisal. Once completed, note the SST number and come into our office to finish the process. Palo Alto is an incorporated city in Santa Clara County. How can I get a copy of a bill of sale? You will be issued the ST-6 or ST-6E upon successful payment. Shortage emergency condition exists within Santa Clara County (County); and. Do You Need to Use a Bill of Sale to Register a Boat in the State?