A South Dakota boat bill of sale is a document that is used for private boat sales to record the transaction between the buyer and the seller. Once the form has been completed, it can be used as proof of purchase by both parties. All motorized watercraft and vessels that are twelve (12) feet in length or longer must be registered with South Dakota Game, Fish, and Parks. Vehicles from out-of-state only need to be registered after they have been in state waterways for more than sixty (60) days. When the buyer registers their newly purchased boat, they can use the bill of sale to prove ownership and to calculate the sales tax.

South Dakota Boat Registration/Titling

Once a private sale has been completed, the buyer will need to apply for a title within forty-five (45) days of purchase. Furthermore, they will need to obtain registration in their name before they can operate the boat in state waters. The new owner must register and title the vessel through the South Dakota Department of Revenue (SDDOR) by following the steps below.

1. Obtain the boat’s Certificate of Title from the seller with the assignment portion completed on the back of the document.
2. Complete the Boat Title and Registration Application.
3. Go to their local county treasurer’s office with the following paperwork:
   • South Dakota Boat Title and Registration Application
   • Boat Certificate of Title or Bill of Sale
   • South Dakota driver’s license or social security card
4. Pay excise tax.
5. Pay title and registration fees.