In 2026, the best strategy for Thailand is a 70:30 split between a multi-currency travel card and physical cash. Thailand remains a "cash-heavy" society for street food, local markets, and small islands, so bringing around 10,000 to 20,000 Thai Baht in cash is wise. For larger purchases, the Thai QR Payment system (PromptPay) has become increasingly accessible to tourists via apps like Moreta Pay or Wise, allowing you to scan codes at even tiny stalls. For ATM withdrawals, be aware that Thai ATMs charge a flat fee of 220 Baht (approx. $6) per transaction, so it is best to withdraw the maximum amount (usually 20,000–30,000 Baht) at once to minimize fees. Always choose "Continue Without Conversion" at ATMs to let your home bank handle the exchange rate, which is almost always cheaper than the "guaranteed" rate offered by the Thai machine.