Riding legally on Koh Samui: license, helmet, police checkpoints (2026)
Most people rent a scooter on Samui without anyone asking for papers, and only find out what the rules are at a police checkpoint or in a hospital. This page is what I check before I ride: which license works, what the police look at, roughly what the fines are, and why the insurance part matters more than the fine.
Colour — all the routes on this site (list under the Routes button on the map), faint — every road I have ridden. GPX works in Maps.me, Organic Maps, OsmAnd, Garmin.
Which license you need
The short answer to whether you need a license to ride a scooter on Koh Samui: yes. Thai law treats any scooter, 110cc or 125cc, as a motorcycle. You need a motorcycle license — your home license with category A, carried together with an International Driving Permit showing category A.
- Home license with A — carry it with an IDP. The IDP is a supplement, not a license on its own.
- IDP — the motorcycle category (A) has to be stamped, not only cars. A car-only IDP counts as no license at a checkpoint.
- Car license only — does not cover a scooter, even a small one.
- Thai license — required if you stay longer than about three months; ask at the land transport office what papers they want now.
Rental shops will hand you a bike without asking for any of this. That is their business model, not a sign that it is legal. If you have no A category, read renting without a license before you decide.
Helmet law and the thing people get wrong
A helmet is required for the rider and the passenger, on every road, including the few hundred metres to the shop. In my experience most fines tourists get on Samui are for exactly this: no helmet, or a helmet hanging from the mirror.
Fasten the strap — an unfastened helmet comes off in the first second of a fall. Rental helmets are often thin and loose; if you ride for weeks, buying your own is worth it. Check prices in the shops on site.
Police checkpoints: where and when
Koh Samui scooter police checkpoints are mobile. They move from day to day, so I do not mark spots on a map — it would be wrong next week.
When: I do not plan around a particular hour.
What they look at: helmet first, then license with category A, sometimes the bike's registration and plate. Turning around in front of a checkpoint gets noticed — and a sudden U-turn on the 4169 is dangerous in itself.
Fines and what to do when stopped
| No helmet (rider) | up to 2,000 baht |
|---|---|
| Passenger without a helmet | rider up to 4,000 baht, passenger up to 2,000 |
| License not carried | up to 1,000 baht |
| Drunk riding | not a roadside fine — police station and court; first offence up to 1 year and/or 5,000–20,000 baht |
These are legal maximums; the officer or the court sets the amount.
- Slow down early, pull over where the officer points, switch the engine off.
- Take off sunglasses, open the visor, stay calm and polite.
- Show your home license and IDP; keep a passport copy on you.
- If fined, pay and take the receipt. In my experience the receipt was accepted at another checkpoint the same day, but do not count on it.
Arguing does not help. If something feels wrong, the Tourist Police number is 1155.
Insurance and if something goes wrong
Every registered motorbike must carry Por Ror Bor insurance: up to 30,000 baht medical a person regardless of fault, and up to 80,000 baht medical (up to 500,000 for death or dismemberment) if the other party is at fault. It does not cover damage to the bike. Anything further is your travel policy. Before you ride, check its wording for three things: motorcycles covered at all, engine size limit, and a valid license for the category. Most also require a helmet.
If there is an accident: 1669 for an ambulance, 1155 for the Tourist Police. What to do step by step, and what to do with the rental shop, is on the accidents page. Rain and darkness raise the risk more than anything in the rules — see riding in rain and at night.
Questions
Do you need a license to ride a scooter in Koh Samui?
Yes. You need a motorcycle license: a home license with category A plus an International Driving Permit with category A. Shops renting without one does not make it legal.
Is a car license enough for a 110cc or 125cc scooter?
No. In Thailand any scooter is a motorcycle, so you need category A. A car-only license, or an IDP without category A, does not cover a motorcycle.
How much is the fine for riding without a helmet on Samui?
Up to 2,000 baht if the rider has no helmet. If the passenger has no helmet, up to 4,000 baht for the rider and up to 2,000 for the passenger.
Can I pay the fine at the checkpoint?
If an officer fines you, pay the way they tell you and keep the receipt with your documents.
Anton A.
I live on Koh Samui and have been riding the island for several years. Every road on these maps I rode myself — the track is a real GPS log. Spotted an error? Message me on Telegram: @abrameicev