Free South Dakota Boat Bill of Sale
South Dakota boats hide two details that trip up buyers. First, the transfer happens at the county treasurer's office in the buyer's county of RESIDENCE — not where the boat is docked, and not at Game, Fish and Parks, which regulates the water but not the ownership. Second, the tax is actually lower than the vehicle rate: boats and motors pay a 3% excise tax, a point below the 4% that cars — and the boat's own trailer — are charged. The title rule is simple: over 12 feet long or motorized (even a trolling motor) means title and registration, due within 45 days; canoes, kayaks, inflatables, and sailboards stay paperwork-free.
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South Dakota Boat Bill of Sale — What You Need to Know
Sales Tax Details
Boats get their own rate in South Dakota: a 3% excise tax on large boats and motors — a point BELOW the 4% that vehicles (and the boat's own trailer) pay. Collected by the county treasurer at titling.
Inspection Requirements
No inspection applies to South Dakota boat sales. The county treasurer verifies the HIN against the title paperwork.
South Dakota Boat Sale — Step-by-Step Checklist
- Apply the 12-foot/any-motor test: longer than 12 feet OR any gas/electric motor means a title must change hands; canoes, kayaks, inflatables, and sailboards are exempt.
- Verify the HIN on the transom against the South Dakota title before paying.
- Write the bill of sale with HIN, make, model, year, length, motor details, price, date, and both signatures.
- Seller signs the boat title over to the buyer.
- Buyer titles and registers at the county treasurer of their county of RESIDENCE — not where the boat lives — within 45 days.
- Buyer pays the 3% boat excise tax (note: lower than the 4% vehicle rate) plus title and registration fees.
- The trailer is a separate transfer — and it pays the standard 4% vehicle excise, not the boat's 3%.
Common Pitfalls
- Going to Game, Fish and Parks with the paperwork — SD GFP handles boating rules, but titles and registration run through the county treasurer.
- Using the county where the boat is docked — South Dakota requires the buyer's county of residence, a distinction that matters for lake-cabin boats.
- Paying 4% — boats and motors owe the 3% boat excise tax; only the trailer pays the vehicle rate.
- Assuming a small fishing boat is exempt — any motor, even electric trolling, puts a vessel of any size into the title-and-register category.
Pro Tip
South Dakota boats: over 12 feet or any motor = title at your home-county treasurer within 45 days, 3% excise for the boat, 4% for its trailer — and GFP only cares once you're on the water.