South Carolina Boat Tax: Rates, Exemptions, and Payment Deadlines

If you own a boat in South Carolina, you’ll deal with two separate taxes: a one-time 5% casual excise tax capped at $500 when you buy the vessel, and an annual county property tax that must be paid before the Department of Natural Resources will register or renew your watercraft. The South Carolina boat tax you pay each year is calculated from the boat’s fair market value, an assessment ratio set by state law, and your county’s millage rate, with most counties applying a local exemption that reduces the taxable value by nearly half.

The One-Time Tax You Pay When You Buy

South Carolina charges a casual excise tax of 5% on the purchase price of a boat or outboard motor, capped at $500 per item. Even on a $50,000 boat, the tax tops out at $500.¹ Items subject to that $500 cap are also exempt from any local sales tax administered by the Department of Revenue.²

Dealers typically collect the tax at the point of sale. For private-party purchases, you pay through the Department of Revenue’s MyDORWAY portal before you title the boat.² Boats acquired from immediate family members are exempt from casual excise tax entirely.¹

If you buy a boat in another state and bring it into South Carolina, you owe South Carolina use tax at the same 5% rate with the same $500 cap. You get a dollar-for-dollar credit for any sales or use tax already paid to the other state. Pay $500 or more there and you owe nothing additional here; pay less and you owe the difference. Report it by filing Form ST-236 with the Department of Revenue, or let DNR collect it when you title the vessel.

The Annual Property Tax

Boats and outboard motors are personal property in South Carolina, and titled or registered vessels appear on the county tax rolls every year. The boat and its outboard motor are treated as separate taxable items, so each one appears as its own line on your bill.³ Watercraft trailers are fully exempt.⁴

State law requires titling for all motorized boats, personal watercraft such as jet skis, and outboard motors rated at five horsepower or more. Sailboats of any length must be titled, and any sailboat with a form of propulsion must also be registered.⁵

How the Bill Is Calculated

Three numbers determine what you owe: fair market value, the assessment ratio, and your local millage rate.

County auditors set fair market value using nationally recognized marine pricing guides such as NADA. State law caps the assessed value at 95% of the prior year’s value, so the taxable value drifts down slightly each year even when guide prices hold steady.⁶ If you paid noticeably less than the guide price because of damage or wear, repair estimates, survey reports, and photos can support a lower value.

Under SC Code § 12-43-220, recreational boats carry a base assessment ratio of 10.5% of fair market value. Commercial fishing boats, tugboats, and pilot boats receive a reduced 5% ratio.⁷

SC Code § 12-37-220(B)(38)(b) then lets each county exempt 42.75% of a watercraft’s fair market value by local ordinance.⁴ Most counties have adopted it, which effectively drops the assessment to about 6% of fair market value. If your county has passed the ordinance, the auditor applies it automatically. No application required.

A Worked Example

For a boat in a county that has adopted the 42.75% exemption:

Fair market value: $20,000
After the 42.75% exemption: $11,450 taxable value
At the 10.5% assessment ratio: $1,202 assessed value
Multiplied by a 0.350 local millage rate: roughly $421 in annual property tax

Millage rates vary by county and by tax district within a county, and they change year to year with local budgets, so your bill can move even if your boat’s value does not. Your auditor’s office can give you the exact rate for your address.

When the Bill Is Due and How to Pay

Boat property tax in South Carolina does not follow a single statewide deadline. Bills run on a staggered monthly schedule tied to your registration renewal date, and the tax must be paid before you can renew.⁸ Since 2021, the $10 annual registration renewal fee has been rolled into the county property tax notice, so both obligations get handled in one payment.⁹

The county auditor generates the bill; you pay it at the County Treasurer’s office. Most counties take cash, check, and credit card, and many offer online portals. After payment, the treasurer issues a stamped receipt showing the tax is paid in full. Without that receipt, DNR will not process your registration.¹⁰

Exemptions That Can Reduce or Eliminate the Bill

Low-value watercraft: any boat or motor with an assessed value of $50 or less is exempt. At the 10.5% ratio, that covers vessels with a fair market value below roughly $475.⁴
The county 42.75% exemption on fair market value, where the county has adopted it.⁴
Commercial fishing, shrimping, or crabbing boats used exclusively for that purpose: 5% assessment ratio instead of 10.5%.⁷
Watercraft trailers: fully exempt.⁴
Active-duty military claiming another state as legal domicile on their Leave and Earnings Statement may be exempt. Contact your county auditor to confirm the exemption applies to your watercraft.¹¹

One boundary worth naming: the homestead exemption for residents over 65 applies only to legal residences, not to recreational boats.

Challenging the Assessed Value

If you believe the auditor overvalued your boat, file a written appeal with the auditor’s office before the tax due date. Filing does not extend the payment deadline.⁸

Appeals succeed on evidence: a recent marine survey, comparable sale prices for similar vessels, repair invoices, photos of wear or damage. Simply disputing the guide price without documentation rarely moves the number. If the county-level appeal does not resolve the dispute, you can escalate through the Department of Revenue’s formal protest process by filing Form C-245 or a written protest within 90 days of a proposed assessment.¹²

Buying or Selling a Used Boat

Sellers must notify DNR in writing within 30 days of the sale using the Request for Boat and/or Motor Status Change form. Skip this step and tax bills will keep generating in your name.¹³ If you already paid the year’s property tax before selling, you may qualify for a prorated refund. Bring a copy of the signed-over title or bill of sale and the completed status change form to the county auditor.¹⁴

Buyers should visit the county auditor first to pay property taxes for the coming year, then take the paid receipt and the signed-over title to DNR to apply for a new title and registration.¹⁰ For a boat purchased from another South Carolina owner, you’ll need the paid property tax receipt in your name, the signed-over title (or bill of sale if no title exists), a $20 boat title and registration fee, and $10 for an outboard motor title.⁹

Late fees kick in quickly. Apply more than 30 days after buying the vessel and you pay a $15 penalty; after 60 days, it doubles to $30. The same schedule applies to registration renewals submitted after their expiration date.⁹

1
South Carolina Department of Natural Resources. Casual Excise Tax
2
South Carolina Department of Revenue. Casual Excise
3
South Carolina Department of Revenue. South Carolina Individual Property Tax Manual
4
South Carolina Legislature. South Carolina Code 12-37-220 – General Exemptions From Taxes
5
South Carolina Department of Natural Resources. SCDNR – Title and Register a Watercraft or Outboard Motor in SC
6
South Carolina Department of Revenue. Business Property Tax and Exemptions
7
South Carolina Legislature. South Carolina Code 12-43 – County Equalization and Reassessment
8
County of Lexington. Personal Property Tax
9
South Carolina Department of Natural Resources. SCDNR – Boating – Title and Register a Watercraft or Outboard Motor in SC
10
Horry County SC.Gov. Boats and Watercraft
11
South Carolina Department of Revenue. Exempt Property
12
South Carolina Department of Revenue. Appeals Process
13
South Carolina Department of Natural Resources. SCDNR – Boating – Title and Register a Watercraft or Outboard Motor in SC
14
Georgetown County, South Carolina. SCDNR Boats and Motors