For a one-week trip to Thailand in 2026, the amount of cash you need depends on your lifestyle, but a safe "mid-range" estimate is $500 to $700 (approx. ฿18,000 to ฿25,000) for a couple. While credit cards are widely accepted in malls and major hotels, Thailand remains a cash-heavy society for street food, local markets, and taxis. A budget traveler can comfortably survive on $35–$50 per day, whereas a luxury seeker should budget $150+ per day. It is a high-value peer tip to use the ATMs only for large withdrawals, as Thai banks charge a flat ฿220 ($6) fee per transaction regardless of the amount. In 2026, many street vendors also accept "PromptPay" QR codes, but this usually requires a local bank account, so physical Thai Baht remains the most reliable currency for tourists. Always keep a stash of small bills (20, 50, and 100 Baht) for tipping your tour guides and "songthaew" drivers, as breaking a 1,000 Baht note at a small stall can be a challenge.