South Dakota Boat Registration
Registration and titling are required for boats over 12 feet long and motorboats of any length.[1] Titling must be done within 45 days of the transfer of ownership.[2]
The new owner must register and title the vessel by following the steps below. 
- At the County Treasurer’s Office of the buyer’s residence, provide the following:
- Boat Title & Registration Application
 - Bill of Sale
 - Original Certificate of Title
 - Identification – A valid South Dakota driver’s license or ID. (An out-of-state license or SSN card may be accepted for out-of-state buyers).
 
 - Pay the excise tax and title and registration fees to the county treasurer.