SC Boat Tax Calculator: How Much You'll Save Under the New 2027 Law (H.3858)

For years, South Carolina has held a title no boater wanted: the highest boat property taxes in the country. A $50,000 pontoon registered in Richland County ran about $2,800 a year. The same boat across the state line in Hartwell, Georgia? Just over $400. That gap pushed thousands of South Carolinians to register their boats out of state, and it eventually pushed lawmakers, after years of false starts, to do something about it.

On March 30, 2026, Governor Henry McMaster signed House Bill 3858 into law. Starting January 1, 2027, the effective property tax assessment ratio on boats will drop from 10.5% to 6%, phased in over three years. The new rate matches what South Carolinians already pay on cars. Statewide, the cut amounts to roughly $40 to $50 million in annual tax relief once fully implemented.

If you own a boat in South Carolina, or you've been registering yours in another state to avoid the bill, here's what changes, who saves the most, and how much you can expect to keep.

What H.3858 actually changes for SC boat owners

The law doesn't reduce the assessment ratio directly. It gets to 6% through a property tax exemption. Specifically, it exempts 42.8571% of a boat's fair market value from property tax. When you apply the existing 10.5% ratio to the remaining 57.1429% of value, the math works out to an effective 6% rate.

That technical detour matters because it gets phased in:

• Tax year 2027: 14.2857% of value exempt, for an effective rate of roughly 9%
• Tax year 2028: 28.5714% of value exempt, for an effective rate of roughly 7.5%
• Tax year 2029 and after: 42.8571% exempt, for an effective rate of 6%

The bill also fixes something boat owners have complained about for years: double taxation. South Carolina was one of only five states that taxed a boat and its outboard motor as separate items. Under the new law, the two get combined onto a single tax notice. Outboard motors of five horsepower or more still need to be registered, but they no longer need a separate title.

The South Carolina Boating & Fishing Alliance celebrated the Senate's near-unanimous vote, calling it a long-overdue cut to "the highest" boat property taxes in the nation and a boost for an industry the group estimates at $6.5 billion. SCBFA statement, March 2026

Which SC counties see the biggest boat tax drops

There's a wrinkle in this bill that most coverage misses. Counties don't set the assessment ratio in South Carolina (the state does), but counties do set local property tax exemptions, and five of them have been quietly giving their boaters a break for years.

Beaufort, Dorchester, Florence, Hampton, and Horry counties already had local ordinances exempting enough of a boat's value to bring the effective rate down to about 6%. Under H.3858, those local exemptions get repealed. The state law specifies that exemptions cannot be combined, and the local ordinances are statutorily wiped on January 1, 2030.

The result is counterintuitive:

That means the largest individual savings show up in places like Berkeley, Charleston, Lexington, Richland, Greenville, Spartanburg, Aiken, York, Pickens, Oconee, Anderson, and the rest of the state. Anywhere a boat owner has been writing the full check.

The Revenue and Fiscal Affairs Office estimates Lexington County will lose more than $6 million in annual boat tax revenue once the cut is fully phased in. That's the largest hit of any county in the state, driven by Lake Murray's deep boat-owning population. Richland follows at roughly $1.9 million a year. In Charleston County, the school district alone is projected to see more than $3.5 million in reduced funding.

Those numbers are exactly the flip side of what shows up in boat owners' wallets.

How much will the new SC boat tax save you?

Take a $50,000 boat in a county with a combined millage rate around 400 mills (a reasonable middle-of-the-road figure for South Carolina). Here's the before-and-after, fully phased in:

That's roughly $900 a year saved on a single $50,000 boat. Scale up for a serious offshore or wakesurf rig, and the numbers get serious quickly.

South Carolina Boat Tax Calculator

Plug in your boat's approximate fair market value below to see your projected SC boat tax under the old and new rules. The calculator uses the standard South Carolina formula: fair market value x assessment ratio x millage rate. Pick your county and the calculator auto-fills a typical millage rate. For the most accurate result, override it with the figure from your last tax bill.

What else SC boaters should know about the new law

Counties may push millage rates up to recover lost revenue. Personal property taxes (boats, cars, airplanes, business equipment) fund schools, county operations, and special districts. The cut to boat taxes leaves a hole. Local officials in Charleston, Lexington, and Richland have all signaled that the math will need to be made up somewhere, whether through millage adjustments or fee changes. Your boat tax bill will fall, but the savings could be partially offset by other line items on the same tax notice.

The cut applies only to boats currently paying 10.5%. Boats already classified as a primary or secondary residence (yes, some liveaboards qualify) are taxed at residential rates and aren't affected by H.3858.

The "registration vs. titling" change starts a year later. While the tax exemption begins in tax year 2027, the new outboard motor registration system, including renewal notices mailed by county auditors, kicks in January 1, 2028.

Bottom line on SC's new boat property tax

If you live in any South Carolina county outside the five with existing exemptions, your boat tax bill will shrink meaningfully over the next three years. By 2029, the same boat that costs you $2,800 today could cost you closer to $1,600. For an industry that supports a $6.5 billion economic footprint and more than 400,000 boat owners across the state, that's the kind of break that's been a long time coming.

It's also a reminder of how much your address matters. Same boat, same value, same fair market. A county line and a millage rate decide what shows up on your November tax notice. The new law narrows the gap. It doesn't close it.

Find your last bill, plug in your numbers above, and see what you'll actually save.

SC boat tax FAQ

When does the new South Carolina boat tax take effect?

H.3858 takes effect January 1, 2027, and first applies to property tax years beginning after 2026. The exemption is phased in over three years: roughly 14.3% of fair market value exempt in 2027, 28.6% in 2028, and the full 42.86% in 2029 and beyond.

How much will boat property taxes drop in South Carolina?

The effective assessment ratio on boats falls from 10.5% to 6%, a reduction of about 43% in the underlying tax math. For a $50,000 boat in a typical SC county at 400 mills, that translates to roughly $900 a year in savings once the cut is fully phased in.

Which South Carolina counties benefit most from the boat tax cut?

The 41 counties currently paying the full 10.5% rate see the biggest drops. That includes Berkeley, Charleston, Lexington, Richland, Greenville, Spartanburg, Aiken, York, Pickens, Oconee, and Anderson. Beaufort, Dorchester, Florence, Hampton, and Horry counties already had local exemptions producing roughly a 6% effective rate, so their bills stay substantially the same.

Does the new SC boat tax law cover outboard motors?

Yes. H.3858 combines a boat and its outboard motor onto a single tax notice, ending the double taxation South Carolina was previously known for. Outboard motors of five horsepower or more still need to be registered, but they no longer require a separate title.

What is South Carolina House Bill 3858?

House Bill 3858 is the 2026 South Carolina law (Act 109, R116) that exempts 42.8571% of a boat's fair market value from property tax. It was signed by Governor Henry McMaster on March 30, 2026, after passing the House 89 to 7 and the Senate 39 to 1.

Will my SC boat tax really drop, or will counties just raise other taxes?

That's a real risk. County officials in Charleston, Lexington, and Richland have publicly said they'll need to find the lost revenue somewhere, whether through millage adjustments or new fees. The state-level cut is locked in, but parts of the savings could be partially offset on other line items of your tax notice over time.