Money on Koh Samui: Cash, ATMs, Cards & Tipping

Money on Koh Samui is simple once you understand a handful of local quirks. Cards work in more places than first-time visitors expect; cash is still essential for the parts of the island that make a trip memorable. The mistakes we see most often are small and avoidable: exchanging at the airport, paying repeated ATM fees, or arriving without a sense of what to tip the villa team.

This guide covers the practical mechanics — currency, ATMs, cards, exchange and tipping — for guests staying in private villas. For the broader budget picture, see our Koh Samui cost breakdown.

The Thai baht in one paragraph

The Thai baht (฿, THB) is the only currency accepted on Koh Samui. Notes come in 20 (green), 50 (blue), 100 (red), 500 (purple) and 1,000 (grey). Coins run from 1 to 10 baht. The 1,000-baht note is the workhorse for villa life — ATM machines dispense them, restaurants and supermarkets break them without comment — but you'll want a stash of 100s and 20s for taxis, tips and street food, where change for a 1,000 is often a polite problem.

Indicative rates fluctuate, but as a working anchor: roughly 38 THB to 1 EUR, 35 THB to 1 USD, 44 THB to 1 GBP. Check live rates at Bank of Thailand before you travel.

ATMs — how they really cost you

Every ATM on Koh Samui charges foreign cards a flat 220 THB per withdrawal. This fee is fixed by Thai regulation and applies whether you withdraw 1,000 or 20,000 THB. Your home bank may add its own foreign-transaction fee on top — typically 1–3%.

Two practical rules follow:

• Withdraw larger amounts less often. One 20,000 THB withdrawal costs the same 220 THB fee as four 5,000 THB ones.
• Use a card with no foreign-transaction fee if you have one. In Europe, Revolut, Wise and N26; in the US, Charles Schwab and Fidelity are common choices.

Most Thai ATMs cap a single withdrawal at 20,000–30,000 THB. Bangkok Bank and Krungsri ATMs tend to allow the higher end. ATMs are everywhere — Tesco Lotus, 7-Eleven forecourts, every shopping plaza in Chaweng, Bophut, Lamai and Maenam.

Cards — where they work and where they don't

Visa and Mastercard are accepted across most of the places a villa guest spends meaningful money: better restaurants, beach clubs, supermarkets (Tesco Lotus, Tops, Makro, Villa Market), boutique shops in Fisherman's Village, spa resorts, and reputable car-rental agencies. American Express works at the upper end — Four Seasons, Six Senses, some fine-dining restaurants — but is far from universal.

Cash-only territory includes:

• Songthaew (red truck) shared taxis and many private drivers
• Local markets, including Maenam Walking Street and the Bophut Friday night market
• Small Thai restaurants, street food, beachside seafood grills
• Muay Thai gyms, yoga drop-ins, most independent massage shops
• Temple donations and small island activities

A 3% surcharge is occasionally added to card payments. It's usually disclosed but not always — ask before signing. Contactless payments work wherever cards are accepted; mobile wallets (Apple Pay, Google Pay) are increasingly common at modern venues.

Currency exchange — where the rates are honest

Exchange rates inside Thailand are almost always better than at your home airport. On the island, licensed booths such as SuperRich (Chaweng, Bophut), Vasu Exchange and bank-branch counters offer rates within a fraction of a percent of the interbank mid-rate. The Samui airport exchange desk is convenient but noticeably worse — change only what you need for the first taxi.

Three practical notes:

• Bring crisp, unmarked banknotes. Torn, written-on or heavily creased foreign bills are routinely refused.
• The larger the denomination, the better the rate. 100 EUR or 100 USD notes typically receive a better rate than 20s.
• Avoid hotel front-desk exchange unless the amount is trivial — rates can be 3–5% worse.

For long stays, no Thai bank account is necessary. Multi-currency cards (Wise, Revolut) cover everyday spend and large withdrawals at minimum cost.

Tipping — what's actually customary

Tipping in Thailand is appreciated but never expected. Refined practice — rather than aggressive over-tipping — is what locals notice and remember. As a rough framework for villa guests:

• Restaurants — round up or add 10% if no service charge is already included; many higher-end restaurants add 10% service automatically.
• Private driver — 100–200 THB per day; more for a long airport transfer or a full-day island tour.
• Spa therapist — 100–300 THB per treatment, handed directly to the therapist.
• Hotel porter — 50–100 THB.
• Boat crew (full-day charter) — 500–1,000 THB per guest, split among the crew.
• Villa staff at end of stay — roughly 5–10% of the total villa rate, distributed across the team (housekeeper, gardener, pool attendant, chef if applicable). Your villa manager will advise on the right total and prepare envelopes.

The villa-staff tip is the one most guests ask us about. There is no fixed rule, but 5–10% of the nightly villa rate over the length of stay is a sensible anchor, weighted toward the housekeeper and any chef who cooked for you. For groups planning a longer celebration or retreat, we usually agree the structure in advance so it's never awkward at checkout.

A simple money plan for a one-week stay

For a couple or small family staying in a private villa for a week, a realistic working plan looks like this:

• 5,000 THB in cash on arrival — covers airport transfer tip, first-day taxis, water at the 7-Eleven.
• One ATM withdrawal of 20,000–30,000 THB in the first 48 hours — covers a week of taxis, street food, markets, beach bars and small-spend extras.
• Cards for everything else — restaurants, supermarket shop, spa, beach clubs, fuel for a rented car or scooter.
• A separate small envelope of 100- and 500-baht notes set aside for tipping.

If you're planning a longer or larger trip — a family of eight, a bachelorette weekend, a wedding — we'll talk through cash needs as part of pre-arrival planning. Yacht charters, private chefs and full-day photographers all have their own cash conventions.

How We Do It

Every villa in our collection is inspected personally and managed by a local team we work with year-round. When you book directly, your villa manager handles the small money questions that no online guide can answer for your specific stay — current ATM locations near your villa, an honest exchange booth within driving distance, how to settle the chef's grocery shop, and the right end-of-stay envelopes for the staff who looked after you.

If you would like a shortlist of villas and a tailored pre-arrival note covering cash, cards and tipping, send a message — a real person on the island will reply within a working day.