Buy a boat from a dealer or broker inside a US state and that state’s sales tax is normally collected at closing, at the state rate plus any local surtax. Buy the same boat privately, or offshore, and no tax is collected at the table — but the obligation does not vanish. It converts into use tax, payable in whichever state becomes the boat’s home, and it generally becomes due on a clock that starts when the boat arrives there.

That is the whole structure in two sentences. Everything else is detail about rates, deadlines, credits and caps — and those details are set state by state, which is why no single figure applies everywhere.

Florida is the clearest worked example, and the one that matters most to Caribbean buyers, because a large share of boats bought in the islands end up there. The Florida Department of Revenue’s guidance on sales and use tax for boat owners and purchasers sets out the mechanics: six per cent use tax plus any applicable discretionary surtax is due on a boat used or stored in Florida that was purchased out of state, and where the boat is titled or registered elsewhere, that tax becomes due within ninety days of the vessel entering Florida.

Two provisions soften it considerably. The first is credit: tax already paid to another state is credited dollar for dollar, so a buyer who paid four per cent elsewhere owes the two-point difference rather than the full six again. The second is the cap. Under section 212.05 of the Florida Statutes, the total tax collected on a single vessel sale is capped, which is why the tax on a two-million-dollar yacht and a three-hundred-thousand-dollar yacht can land at the same number. For larger vessels, that cap is often the single most important line in the whole calculation.

Other states run the same logic with different numbers and different clocks. Some have no cap at all. Some measure the deadline from purchase rather than arrival. Some treat a boat that stays under a threshold number of days as never having established use there. The principle transfers; the arithmetic does not.

The distinction catches cruisers more than any other group, because a cruising boat does not sit still long enough to make the answer obvious.

Sales tax is transactional. It attaches to the act of sale in a jurisdiction that taxes sales, and it is usually collected by the seller. Use tax is the complement: it exists precisely so that buying outside a state does not create an advantage over buying inside it. It attaches to bringing the boat home and using it there, and it is self-reported by the buyer rather than collected by anyone.

Because use tax is self-reported, it is easy to believe it has been avoided when it has only been deferred. Registration is where it usually surfaces. Applying to register or title a vessel in a state is, in effect, telling that state the boat is now here — and most revenue departments treat the registration record and the use-tax record as the same conversation.

Documentation with the US Coast Guard adds a layer people misread. Federal documentation establishes nationality and provides a clean chain of title; it is not a substitute for state registration and it confers no tax exemption. A documented vessel kept in a state is still a vessel kept in a state.

This is where Caribbean buyers need advice that general US boat-tax pages do not provide, because the British Virgin Islands and the US Virgin Islands are treated very differently despite sitting a few miles apart.

The BVI is a British Overseas Territory and, for these purposes, foreign. A purchase there is an offshore purchase: no US state sales tax is charged at closing, and the transaction itself sits outside the US tax system entirely. What happens next decides the liability. Keep the boat cruising in the Caribbean and no state has a claim. Bring it to Florida, Texas or the Carolinas and establish it there, and the use tax of that state attaches on its own timetable. The purchase being foreign does not exempt the boat; it only means nobody collected anything at the table. Buyers new to the region will find the wider mechanics in our guide for first-time buyers in the British Virgin Islands.

The USVI is the more commonly misunderstood case. It is US territory, so a vessel there is in the United States for many purposes — but it sits outside the US customs territory. That combination means a boat moving from St. Thomas or St. Croix to the US mainland is making a customs entry, not simply moving between domestic ports, while simultaneously not being a foreign-flag arrival in the ordinary sense. Buyers routinely get one half of that right and the other half wrong. Tax treatment is only half the diligence on an offshore purchase; the other half is mechanical, and how many engine hours are too many depends far more on the service records than on the number itself.

Neither territory issues a result that survives being ignored. The reliable planning question is not where the closing happens but where the boat will spend its first year, because that is the question a revenue department will eventually ask.

Tax and customs are separate obligations and are settled with different agencies, which is why a buyer can clear one and still owe the other.

A foreign-built vessel entering the United States for the first time is a formal importation. Duty is assessed on the declared value of the vessel under the pleasure-craft headings of the Harmonised Tariff Schedule, and for most sailing yachts and motor yachts the applicable rate is low — typically in the range of one to one and a half per cent of value, with the precise figure depending on the subheading and the vessel’s country of origin. Trade-agreement origin can reduce it to nothing. Because that determination is specific and binding, it is worth getting from a customs broker rather than from a rate table.

The paperwork chain matters more than the percentage. A customs entry generally wants the bill of sale, evidence of the vessel’s build and origin, and documentation or registration papers, and the entry has to be made at a port of entry by someone authorised to make it. Foreign-flag vessels arriving for cruising rather than importation operate under a different regime again, using cruising licences where reciprocal privileges exist.

For a first-time importer the practical advice is simple: engage a customs broker before the boat moves, not after it arrives. Corrections made at the dock are considerably more expensive than a determination made in advance, and the survey stage is the natural moment to have the conversation — the same stage where a pre-purchase survey cost is already being budgeted.

At a brokered closing, the tax treatment should appear on the closing statement in plain terms rather than being left as an assumption. Where a state’s tax is collected, it is itemised. Where it is not collected because the sale is offshore or the buyer is taking the boat elsewhere, the statement should say so explicitly, so that nobody leaves the table believing an obligation has been extinguished when it has merely been deferred. Where the closing happens changes the tax exposure, so what the purchase agreement should say about delivery point and acceptance is not boilerplate worth skimming.

A broker’s job here is disclosure, not advice. We will tell you plainly what is and is not being collected, what the chain of documents needs to contain, and which specialists to bring in. We will not tell you what you owe in your home state — that is a question for a marine tax attorney or an accountant who works in your jurisdiction, and the sums involved on a yacht are more than large enough to justify one.

For buyers still forming a budget, the tax line belongs in it from the beginning rather than appearing at the end. It sits alongside survey, insurance, registration and delivery in the full cost to buy a yacht in the BVI, and on a larger vessel it is frequently the biggest single one-off item after the purchase price itself. Buyers considering a charter-managed yacht should also take advice early, because placing a vessel into a revenue-earning programme changes the analysis in ways a private-use calculation will not capture.