How to register a boat in South Dakota
Title and register within 45 days of purchase
Contact your county treasurer within 45 days of purchase to pay the tax, apply for a title (if the boat requires one), and register the boat. Registration is done at the treasurer's office in the county where you reside — not where the boat is kept or used. If you bought the boat out of state, bring proof of any tax already paid, because South Dakota may charge the difference.
Bring proof of ownership
Provide ownership documents: a manufacturer's statement of origin (MSO) for a new boat, or a bill of sale, dealer invoice, or purchase agreement for a used one — unless the dealer completed the price certification on the application. Bring the assigned certificate of title if the boat is already titled, and a photo ID. For a boat that must be registered but not titled, bring proof that sales or use tax was paid at purchase.
Pay the 3% boat excise tax plus fees
South Dakota levies a 3% boat excise tax on the purchase price of most boats (including delivery charges, less any trade-in allowance) in lieu of state sales tax. The one-year registration fee is $18, $30, or $55 depending on the boat, and there is a $10 title fee where a title is required, plus a $3 administrative fee and $2 technology fee. Note that a boat trailer is taxed separately at the 4% motor-vehicle excise rate.
Receive your registration and display the decal
The county treasurer issues a registration listing your assigned boat number, a description of the boat, and the owner's name and address. Paint or apply the SD number (format "SD 1234 AB") on both sides of the forward half of the hull in block characters at least 3 inches high in a contrasting color, readable from 100 feet, with the validation decal affixed next to the number on each side. Keep the registration aboard the boat at all times, available for inspection.
South Dakota registration fees
South Dakota sets the one-year registration fee by boat type and length, not by a long class ladder. The figures below are the current state fees from the Department of Revenue; a $10 title fee applies where a title is required, plus a $3 administrative fee and a $2 technology fee per license. Remember the fee is separate from the 3% boat excise tax you pay on the purchase.
| Class | Vessel length | Base fee |
|---|---|---|
| Non-motorized over 12 ft & electric-motor boats | Over 12 ft (or any electric-powered) | $18 / year |
| Motorboats under 19 ft | Under 19 ft (includes jet skis) | $30 / year |
| Motorboats 19 ft and over | 19 ft and over | $55 / year |
One-year fees from the SD Department of Revenue boats page. Add the $10 title fee (where titling is required), $3 administrative fee, and $2 technology fee. Confirm the current total with your county treasurer.
Titling in South Dakota
South Dakota titles most substantial boats. A "large boat" — defined by statute as any boat over 12 feet in length, or any motorboat capable of being used for transportation on water — must be both titled and registered, as must personal watercraft such as jet skis, wave runners, and water scooters. The title is the ownership record filed through the county treasurer with the Motor Vehicle Division.
A federally documented vessel is the key exception: because the U.S. Coast Guard Certificate of Documentation is the ownership record, South Dakota does not issue a state title for a documented boat — but it must still be registered (and the 3% boat excise tax still applies). This is the classic "documented but not titled" arrangement explained in state registration vs USCG documentation.
HIN requirements
South Dakota requires a Hull Identification Number (HIN) on boats that must be titled and registered. For any boat whose construction began after October 31, 1972, the HIN is the code the manufacturer permanently affixed to the hull under federal law, and it must be recorded accurately on the title and registration.
If a boat's HIN is missing, damaged, or was never assigned — a home-built boat, or an older or out-of-state hull with no valid factory number — the Department of Revenue, working in cooperation with the county treasurer, assigns a state HIN prefixed with the letters "SDZ." South Dakota does not require a routine hull inspection to register a boat; an inspection is only triggered when there is a discrepancy in the hull number or the paperwork.
Before you file, decode any existing hull number with the HIN decoder to confirm the manufacturer and model year match your bill of sale or MSO — catching a mismatch up front avoids the discrepancy inspection and a state-assigned SDZ number.
Renewal
South Dakota boats are licensed annually under a staggered registration system. The renewal month is fixed by the first letter of the owner's last name (or, for a company, the first letter of the corporation or LLC name), so registrations do not all expire at once. Renew through your county treasurer — online, at a DMV Now self-service kiosk, or in person — keeping the current decals on both sides of the hull and the registration aboard.
Exemptions
Small non-motorized boats are exempt: any canoe, kayak, inflatable boat, sailboard, or paddleboard, and any non-motorized boat 12 feet or under, does not have to be titled or registered — though it is still subject to state sales or use tax at purchase. The moment you add a motor of any kind, including an electric trolling motor, the boat must be registered regardless of length. Seaplanes are not registered as boats (they fall under the Department of Transportation). A visiting boat validly registered in another state or documented by the Coast Guard may operate in South Dakota without registering here until it has been in the state for more than 60 days, or is docked in a state-controlled marina under a contract longer than 60 days. Accredited schools, non-profit hospitals, approved relief agencies, and government entities are exempt from the boat excise tax and sales/use tax.
Frequently asked questions
Do I have to register a kayak or canoe in South Dakota?
No — a non-motorized canoe, kayak, inflatable, sailboard, or paddleboard 12 feet or under does not have to be titled or registered. It becomes registrable only if it is longer than 12 feet or if you add a motor of any kind, including an electric trolling motor. Sales or use tax still applies when you buy it.
How much is the boat excise tax in South Dakota?
South Dakota charges a 3% boat excise tax on the purchase price of most boats (including delivery charges, less any trade-in) in place of state sales tax. Note this is the boat rate — a boat trailer is taxed separately at the 4% motor-vehicle excise rate. If you paid tax to another state, South Dakota grants credit and collects only the difference.
Where do I register my boat in South Dakota?
At the county treasurer's office in the county where you live — not where the boat is kept or used. The treasurer works with the Department of Revenue's Motor Vehicle Division to issue your title (if required) and registration. You have 45 days from purchase to pay the tax, title, and register.
Does South Dakota title boats?
Yes. Any boat over 12 feet, any motorboat capable of transporting a person on water, and personal watercraft such as jet skis must be titled through the county treasurer. The exception is a U.S. Coast Guard documented vessel, which is registered but not state-titled because the federal Certificate of Documentation is the ownership record.
When does my South Dakota boat registration expire?
Boats are licensed annually on a staggered schedule set by the first letter of the owner's last name (or company name), so your renewal month depends on your name. You can renew through your county treasurer online, at a DMV Now kiosk, or in person.
Primary sources
Last verified .
- SD Department of Revenue — Boats (titling, registration, fees) (retrieved 2026-07-16)
- SD Department of Revenue — Boat Titling and Registration (Tax Fact PDF) (retrieved 2026-07-16)
- SD Game, Fish & Parks — Licensing Your Boat (retrieved 2026-07-16)
- SD Department of Revenue — Motor Vehicle Division (retrieved 2026-07-16)
Independent reference tool — not affiliated with, endorsed by, or sponsored by the U.S. Coast Guard or the National Maritime Center. Vessel data is derived from public USCG sources and may lag official records; always verify with the issuing authority.
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