Overview
Two deadlines apply depending on what you bought: large boats get the same 45-day window as cars, while personal watercraft - jet skis specifically - must be titled and registered within just 30 days of purchase. And boat trailers are their own animal entirely: titled separately from the boat, taxed at the full 4% vehicle rate (not the boat's 3%), and registered every year regardless of the boat's own registration cycle. Canoes, kayaks, inflatable boats, and sailboards skip titling altogether and instead pay the state's 4.5% sales tax at the point of purchase, like any other retail good.
01 - Official fees
South Dakota boat registration fees at a glance
| Fee | Amount | Notes |
|---|---|---|
| Electric motor / non-motorized boat over 12 ft | $18/yr | |
| Motorized boat under 19 ft | $30/yr | |
| Motorized boat 19 ft and over | $55/yr | |
| Boat/personal watercraft excise tax | 3% | of price minus trade-in |
| Title fee | $10.00 | |
| Boat trailer excise tax | 4% | titled and taxed separately from the boat |
| Canoes, kayaks, inflatables, sailboards | 4.5% sales tax | no title or registration required |
Figures verified June 2026 against official sources (listed below). Always confirm the final amount with your county treasurer's office (SD Dept. of Revenue) - counties can add small local fees.
02 - Step by step
How to register a boat in South Dakota
- 1
Get the signed-over boat title (and a separate title for the trailer, if included).
- 2
Bring the title, bill of sale, and ID to the county treasurer of your residence - not where the boat is kept.
- 3
Large boats: file within 45 days of purchase. Personal watercraft like jet skis: file within 30 days.
- 4
Pay the 3% excise tax, the $10 title fee, and the length-based annual registration.
- 5
Display the assigned boat number and validation decal, and keep the registration in the boat for inspection.
03 - Same state, other costs
More South Dakota vehicle costs
04 - Common questions
South Dakota boat registration FAQ
How much does it cost to register a boat in South Dakota?
Annual registration is $18 for electric-motor or non-motorized boats over 12 feet, $30 for motorized boats under 19 feet, or $55 for 19 feet and over. First-time buyers add a $10 title fee and 3% excise tax on the purchase price - a full point below the 4% rate on cars.
Why do jet skis get 30 days but boats get 45?
South Dakota law simply sets a shorter window for personal watercraft - jet skis, wave runners, and water scooters - than for large boats. Miss either deadline and the same excise-tax interest and penalty structure that applies to cars kicks in.
Do I need to register a canoe or kayak?
No - canoes, inflatable boats, kayaks, and sailboards fall outside South Dakota's 'large boat' definition entirely. They're not titled or registered at all; you simply pay the state's 4.5% sales tax when you buy one, same as any retail purchase.
Why did I pay two different tax rates buying a boat with a trailer?
Boats and boat trailers are titled - and taxed - separately in South Dakota. The boat itself pays the 3% boat excise tax, but the trailer is legally a motor vehicle and pays the standard 4% rate. The dealer has to itemize both prices on the invoice for this reason.
Does a trade-in reduce the boat excise tax?
Yes - trading a boat, personal watercraft, or trailer toward another one gives you credit for the trade-in's value, and the 3% (or 4% for trailers) applies only to the difference, same as the vehicle trade-in rule.
What if I bought my boat out of state?
South Dakota's 3% excise tax is still due based on the purchase price, but you get credit for any sales or excise tax already legally paid to the other state - if that state's tax equals or exceeds 3%, nothing more is owed here.
05 - Receipts
Official sources
Every number on this page comes from these documents - check them yourself.