We get this question on the dock almost every morning, usually from someone holding a fresh stack of guilders they didn't need to buy. So let's clear it up before you leave home. St. Maarten runs on a friendlier money system than most first-timers expect, and once you know the few rules, you can stop worrying about exchange rates and start thinking about which beach to hit first. We're a family-run crew that sails these waters year-round, so this is the straight version, not a brochure.

The Quick Answer: What to Bring to St. Maarten

If you remember nothing else: US dollars plus one card with no foreign-transaction fee will cover almost everything you spend. Bring a backup ATM or credit card too, since American Express is not accepted in many places on the island.

Keep a stash of small US bills (ones, fives, and tens) for taxis, buses, beach vendors, and tips. Use the card for the bigger stuff like hotels, restaurants, shops, and tours, and pack a second card as backup in case one gets declined, lost, or skimmed. You do not need to change money into guilders or euros before you fly, and you definitely don't need to do it at an airport exchange counter. That's the whole strategy.

Two Sides, One Island, Two Currencies

Here's the fun part that catches people off guard. You're visiting one small island, roughly 87 square kilometers, that has been split between two countries since the 1648 Treaty of Concordia, with France taking the larger northern slice and the Netherlands the south, about a 60:40 share. There are no border posts, no passport checks, and no customs stop when you cross. You'll often only know you've changed countries because the road signs switch languages. Money is the main thing that changes when you cross that invisible line.

Sint Maarten (Dutch Side): The Caribbean Guilder

The Dutch side got a new official currency on 31 March 2025: the Caribbean guilder (XCG). It replaced the old Netherlands Antillean guilder, which was withdrawn as legal tender on 1 July 2025. The bills look new, but don't let that rattle you. Straight from the island's central bank, the Caribbean guilder is pegged to the US dollar at a fixed rate of about one dollar to 1.79 guilders. That's the same peg the old guilder used, so any conversion math from a previous trip still holds. New name, new notes, same dollar value. If a menu lists a price in guilders, just divide by roughly 1.8.

Saint-Martin (French Side): The Euro

Cross to the French side and the official currency is the euro. The French side is part of the eurozone and the European Union, though for the trivia lovers it sits outside the Schengen Area and the EU VAT area. For you as a visitor, that's a currency note, not a border note. Nobody is checking your passport when you drive north for lunch.

Why US Dollars Work Almost Everywhere, On Both Sides

Even with two official currencies, the US dollar does most of the heavy lifting. According to the island's official travel information, US dollars are accepted almost everywhere on both sides, even though the euro is official in the north and the Caribbean guilder in the south. On the Dutch side the dollar is effectively the everyday working currency, and prices are frequently quoted in dollars. On the French side dollars are widely taken too, though your change may come back in euros and the dollar rate a shop uses won't always be the kindest. If you're mostly Dutch-side with a day trip north, dollars plus a card is all you need.

Cards, ATMs, and the Fees Nobody Mentions

Cards are fine for the big stuff. Hotels, restaurants, dive shops, tour operators, and the stores along Front Street and the Philipsburg boardwalk will nearly all take Visa and Mastercard, with Discover in plenty of places too. American Express is the one to watch — it's not accepted in many places on the island, so don't count on it as your only card; bring a backup Visa or Mastercard instead. The official St. Maarten tourism board also makes a point worth repeating: cards are accepted in certain establishments, and you should carry extra cash for the smaller mom and pop businesses that often take cash only. The lunch shack with the best ribs you'll eat all week is not going to run your tap-to-pay.

Where to Find ATMs (Including at the Airport)

Princess Juliana International Airport has ATMs in both the arrivals and departures halls that accept Mastercard, Visa, Discover, and American Express. Beyond the airport, 24-hour ATMs are available on both sides of the island. Two heads-ups come straight from the airport's own guidance. First, fees may apply, so check your daily withdrawal limit and tell your bank you're traveling internationally before you go, or your card may freeze on the first swipe. Second, the airport's currency exchange counters are not the best place to change money, so skip them and use an ATM instead.

Dodging Foreign Transaction Fees and Dynamic Currency Conversion

Two fees quietly pad a vacation bill. Many banks tack a 1% to 3% foreign-transaction fee onto card charges made abroad, no matter which currency you pay in, so one no-fee travel card is worth setting up before the trip, and bring a second, backup card from a different bank in case the first one gets declined or flagged. The second is sneakier. When a card machine or ATM asks whether you'd like to be charged in US dollars (your home currency) or the local currency, always choose the local currency. Picking home currency hands the conversion to the merchant's machine at a worse rate, a trick known as dynamic currency conversion, instead of letting your own bank do the math. Local currency, every time.

When You'll Still Need Cash

So where does that small-bills stash actually get spent?

• Mom and pop food spots, bakeries, and roadside vendors.
• Beach vendors selling drinks, chair rentals, and the occasional fresh coconut.
• Minibuses, which are cash only.
• Tips, which are far easier to hand over in cash.

Keep the bills small. Drivers and vendors don't always carry change for a fifty, and nobody wants to watch you break a big note while the bus idles.

Tipping in St. Maarten and St. Martin: Two Different Customs

This is the one that trips up first-timers who eat lunch on one side and dinner on the other in the same afternoon. The two sides tip differently, and knowing which is which keeps you from under-tipping a server or quietly paying twice.

Dutch Side Restaurants: Tip Like You Would at Home

On the Dutch side, restaurants largely follow the American system, where service is not usually baked into the menu price, so a tip of roughly 15%, sometimes 15% to 20% for great service, is the norm. That said, some restaurants already add a service charge to the bill, so check before you tip to avoid paying twice for the same meal. If no service charge appears, tip the way you would back home and you'll land right where locals expect.

French Side Restaurants: Check the Bill Before You Tip Again

The French side plays by French rules. Wait staff earn a standard wage, and a service charge is typically already included in your bill, often printed as service compris or shown as a 15% line. An extra tip is optional rather than expected, and a few coins for genuinely good service is plenty. Watch the trap on both sides: a Tax or Service Charge line is usually a gratuity, not a government tax. Glance at the bill before you add another tip on top, or you'll tip twice without meaning to.

Tipping Taxi Drivers, Tour Guides, and Boat Crew

Tipping a taxi driver isn't a legal requirement here, but it's widely practiced, and the same logic extends to tour guides and boat crew on a day out. Small US bills are the easiest way to do it. A quick tip for the folks who poured your rum punch, pointed out the best snorkel spot, and got you back to the ship on time is always appreciated. A habit from the airport's own advice: jot down the cab company, the vehicle number, and the driver's name in case you leave something behind.

A Simple Pre-Trip Money Checklist

• Tell your bank you're traveling internationally so your card doesn't freeze.
• Pack a stack of small US bills for taxis, buses, vendors, and tips.
• Bring one card with no foreign-transaction fee plus a backup card, remembering that American Express isn't widely accepted, and choose local currency when a machine asks.
• Remember the exchange rate: about 1.79 to 1.80 guilders to the dollar on the Dutch side.
• Set aside a little tip cash for your taxi driver and boat crew.

FAQ: Quick Answers to Common Money Questions

How much is one US dollar in St. Maarten? About 1.79 Caribbean guilders on the Dutch side, thanks to the fixed peg. The government taxi guide rounds it to 1.80 for fare math.

What's the best currency to bring? US dollars. They're accepted almost everywhere on both sides, so there's no need to buy guilders or euros before you arrive.

Can you use US dollars on the French side? Yes, dollars are widely accepted in Saint-Martin even though the euro is official there. Your change may come back in euros, and a card often gives a cleaner rate for larger purchases.

Is the Caribbean guilder the same as the old guilder? New name and new notes since 31 March 2025, but the same US dollar peg, so the conversion math hasn't changed a bit.

Sort your dollars and one good card before you fly, keep small bills for the cash-only moments, and you'll glide from one side to the other without a single currency headache. When you're ready to spend the best part of your trip offshore, come book your day on the water with us and we'll take it from the dock.