The short answer

That's the right approach for most British holidaymakers. It keeps the amount you carry through airports low, avoids the poor rates of UK bureaux on most of your money, and still gives you a safety net.

Two situations call for more. If you're a family arriving late at night at a smaller airport, or heading straight to an island, carry enough baht for the first two days. And because Thai immigration can ask to see evidence of ฿20,000 per person, it's worth having either some cash or an easy way to show your funds — more on that below.

If your cards aren't fee-free abroad, that's the first thing to fix. On a standard card, each withdrawal in Thailand costs 2.75% to 2.99% in UK bank fees on top of the Thai ATM fee.

Thailand's proof-of-funds rule

Thai immigration rules have long allowed officers to ask foreign visitors to show they have enough money for their stay. The amounts date from a 2000 Interior Ministry announcement, and the Tourism Authority of Thailand reminded travellers about them in July 2026:

Children under 12 are exempt. Because official sources differ on the figure for visa-exempt visitors — which covers most British holidaymakers — it's safest to be ready to show the higher amount: ฿20,000 per person, about £452, or ฿40,000 for a family, about £904.

In practice, most travellers are never asked. Officers have discretion, and checks are more likely if you look like you might overstay or work. But if you are asked and can't show funds, it can count against you. Funds can be in baht, an equivalent amount in another currency, or documents showing equivalent funds — so a recent bank statement or banking app balance may help. Official guidance doesn't say a card on its own will always be accepted.

Customs limits: UK and Thailand

You're unlikely to come near these limits on a normal holiday, but they matter if you're moving to Thailand, buying property or carrying cash for family:

There's no limit on how much cash you can take out of the UK — you simply have to declare £10,000 or more. Failing to declare can lead to the cash being seized and having to prove where it came from. Failing to declare in Thailand is a criminal offence.

If you're thinking about carrying a large sum to Thailand for a deposit, a car or a property, don't. A bank transfer is safer, cheaper and leaves a clear record — and for property, a record of funds coming from abroad can matter later.

Should you buy baht before you fly?

Buying baht in Britain gives you cash in your pocket when you land — but you pay for that convenience in the exchange rate. These were the Post Office's online rates on 11 October 2026, against a mid-market rate of ฿44.27:

For a small amount of arrival money, the Post Office's lowest tier costs about 8% more than the mid-market rate — around £24 on £300. Branch rates and airport bureaux are often worse again. For larger amounts the rate improves, but even at £1,000 it costs about £37 compared with the mid-market rate — more than twice the cost of withdrawing the same amount from Thai ATMs on a fee-free card.

So the sensible approach is: if you want baht on arrival, buy a small amount — or simply withdraw at the airport in Thailand on a fee-free card. Don't buy your whole holiday budget in the UK.

A middle way is a multicurrency account such as Wise. You can convert pounds to baht at the mid-market rate before you fly — locking in your rate — and then withdraw it from Thai ATMs or spend it on the card. You still pay the Thai ATM fee, but not a bureau's margin.

Bringing sterling to exchange in Thailand

Thailand has a large number of currency exchange counters, and the specialist exchangers in Bangkok and the main tourist towns often offer competitive rates for pounds — usually far better than UK bureaux, and with no ATM fee. Hotels, banks at the airport arrivals level and small shops generally offer worse rates.

• Bring clean, undamaged notes. Torn, marked or very old notes may be refused or exchanged at a lower rate.
• £50 and £20 notes usually get better rates than smaller notes.
• Take your passport — exchange counters are required to see it.
• Compare two or three counters; rates are displayed on boards and vary.
• Count your baht at the counter before you leave.
• Avoid street touts offering better-than-posted rates.

For most holidaymakers, the main value of carrying sterling is as an emergency reserve: if both cards are blocked or lost, £100 to £200 in clean notes buys you time to sort things out. For larger amounts, exchanging sterling can be slightly cheaper than several ATM withdrawals, but you carry the risk of losing it in transit.

How much cash you'll use each day

How much cash you'll actually need depends far more on your style of travel than on your budget. In Thailand, the bigger and more formal the business, the more likely it takes cards. The smaller and more local, the more likely it's cash only.

If you pay your hotel, flights and tours by card, a couple on a typical holiday often gets by on a few thousand baht a day in cash, more if they eat at markets and take taxis a lot, less if they're mostly in Bangkok malls and using Grab. Islands, rural areas and the north lean more heavily on cash than central Bangkok.

A practical routine: withdraw ฿20,000 on a fee-free card when you arrive, see how quickly it goes, and top up in the same large amounts. That keeps your ATM fees low and tells you your real daily cash needs within a few days.

Keeping cash safe

Thailand is generally safe for visitors, but cash is the one thing you can't get back if it's lost or stolen — and many travel insurance policies cap cover for cash at a few hundred pounds, with conditions. A few habits help:

• Split your money between your wallet, your bag and the hotel safe.
• Carry only the day's cash, especially on nights out, at the beach and on boat trips.
• Keep emergency sterling separate from your everyday cash and cards.
• Use the room safe for passports, spare cards and the bulk of your cash.
• Don't flash large notes in markets or bars.
• Check your insurance for its cash limit and what proof it needs, such as a police report.

If cash is stolen, report it to the Tourist Police (dial 1155) and get a written report for your insurer. If cards go missing at the same time, freeze them in your banking apps first.

The best ways to get baht

Four options for getting baht, from the cheapest for most people to the most convenient before you fly.

Moving to Thailand? Don't carry it — plan it

If you're relocating or retiring to Thailand, the question isn't how much cash to bring — it's how to move your money properly. A retirement visa typically requires ฿800,000 in a Thai bank account or a monthly income of ฿65,000; a condo purchase needs funds transferred from abroad; and pensions, savings and investments all need a plan.

Carrying large amounts of cash through customs is risky, has to be declared above £10,000 when leaving the UK and US$20,000 when entering Thailand, and leaves you without a clear record of where the money came from. A planned transfer — at the right time and the right rate — is safer and can save a great deal.

Your cash checklist for the flight

• Two fee-free cards from different banks, one Visa and one Mastercard.
• A few thousand baht for arrival — or a plan to withdraw at the airport.
• £100–200 in clean sterling as an emergency reserve.
• Proof of funds — a recent statement or balance screenshot on your phone.
• Your PINs for every card.
• Notifications on and card freeze set up in each app.
• Insurance documents and the cash-cover limit noted.
• Declare £10,000+ on GOV.UK if, unusually, you're carrying that much.