The legal answer sets the ceiling — no more than USD 3,000 per visit in notes. The practical answer is usually far below it. Carrying too much cash is the most common and most expensive travel-money mistake, and it is entirely avoidable with ten minutes of thought before you fly.
What cash is genuinely for
- The airport transfer at the other end, before you have found a working ATM.
- Tips, in countries where tipping is expected in cash.
- Small vendors, markets and taxis in cash-preferring economies.
- A reserve, kept separately from your wallet, for the day a card does not work.
Everything else is better on a card: it is safer, it is traceable, and it converts at a better rate than a bureau will give you abroad.
A split that works, by destination
- Western Europe, UK, Singapore, UAE — card-first economies. USD 200 to 300 equivalent in cash is plenty.
- United States — cards everywhere, but tipping is cash-friendly and some small businesses are cash-only. USD 300 to 400.
- Japan — still meaningfully cash-based outside big retailers. USD 400 to 600 equivalent.
- Southeast Asia — markets, taxis and small restaurants prefer cash. USD 300 to 500 equivalent.
- Smaller cities and rural areas anywhere — raise the cash portion; card acceptance thins out fast outside metros.
Why not simply carry the full USD 3,000
- 1Losing it means losing it. There is no replacement for cash, and travel insurance cash limits are low.
- 2What you do not spend has to come home and be sold back, at the dealer's buy rate, which is lower than the rate you bought at. Unspent cash is a guaranteed small loss.
- 3You may keep only USD 2,000 on return; above that it must be surrendered within 180 days.
- 4Coins cannot be exchanged anywhere. Whatever you have in coins on the last day is spent or lost.
Practical arrangements
- Split the cash. Some in a wallet, some in the hotel safe, some in hand luggage. Never all in one place.
- Ask for smaller denominations. A USD 100 note is awkward in a taxi and refused in some small shops.
- Carry the currency of the country, not dollars, unless dollars are widely accepted there. Converting dollars locally is a second markup.
- Keep the encashment certificate at home, not with the cash. You need it to sell the remainder back.