How much cash to carry when you travel

The question is usually asked as a number — how much cash should I bring to Vietnam? There is no honest answer in that form, because the amount depends on facts that change at every border and sometimes at every island. What there is instead is a short set of questions that produce your number rather than somebody else's.

Three questions that set the amount

Work through these in order. The first is about the country, the second is about your route through it, and the third is about you.

How does this country actually pay? Not how developed it is — how it pays. These correlate far less than people expect, and assuming otherwise is the classic mistake.
How far are you from a machine that works? Not from any ATM: from one that accepts your card, has money in it, and is somewhere you are willing to stand.
What could you lose without the trip ending? Cash is the one asset with no recovery path. Everything else can be cancelled and reissued.

Wealth does not predict card acceptance

Japan is the standing counter-example: a high-income country where small restaurants, shrines, rural areas and some ticket machines still expect cash, and where not every ATM will even accept a foreign card. Travellers get caught precisely because they assumed a wealthy country would be card-first.

It runs the other way too. Singapore is close to fully cashless, and India runs on an instant-payment system so ubiquitous that cash looks obsolete — until you discover it is built around domestic bank accounts and you, as a visitor, cannot use it. The lesson is that this is a per-country fact to look up, not something to reason about from first principles. That is what the country pages exist for.

Distance from a working machine

Within a capital city, carrying a large float is mostly pointless — you are never more than a few minutes from a top-up, so the right amount is small and frequently replenished. The calculation inverts as soon as you leave.

Where the number really moves

Island-hopping, trekking, long overland stretches and rural stays are where people run dry. In the Philippines, ATMs thin out fast once you are off the larger islands, and the ferry that takes you there will not take a card either.

The rule is to carry for the gap ahead of you, not for the day you are having. Withdraw before the remote stretch, in the last place where the machines are reliable — never after.

This is also the honest counterweight to the advice that fewer, larger withdrawals are cheaper. They are — two of the four charges on a withdrawal do not scale with the amount — but the saving is only real if you are comfortable carrying the result.

Split it before you need to

Whatever the number turns out to be, it should not all be in one pocket. The usual arrangement is a working amount on your person and the rest somewhere else — a hostel locker, a hotel safe, the bottom of a bag.

The security argument for this is obvious: a theft, a lost bag or a pickpocket costs you the working amount rather than the trip. The reason to decide the split in advance is that you will not do it thoughtfully at eleven at night in a room you have just walked into — so pick the working number before you arrive, and treat topping it up as a deliberate act.

Some currencies cannot come with you

A few countries restrict their currency by law, and it changes how much you should hold as you approach the exit. The Moroccan dirham is a closed currency: it cannot legally be taken out in quantity and is hard to obtain abroad, so you get it on arrival and change the remainder back before you fly. The Indian rupee carries limits on being carried in and out for the same reason.

Where a restriction applies, the shape of your withdrawals should change near the end: smaller and more frequent, accepting the extra fees, because the alternative is a pile of notes you are not permitted to leave with. Everywhere else, leftover currency is simply a holding in a currency you have stopped using — not spent, not gone, and worth recording as such rather than letting it vanish from your totals.

Think in re-up points, not in a total

The most useful mental model is not “how much cash for Vietnam” but “where are my next three top-up points, and how much do I need to reach the one after”. A trip total invites you to withdraw a large amount early and carry it for weeks, which maximises both the risk and the amount of leftover currency you have to deal with at the border.

Buying local currency before you leave home is usually the worst of both: you pay a poor rate for the privilege, and in restricted-currency countries you may not legally be able to do it at all. The exception is a small arrival buffer — enough for a taxi and a meal — so that your first hour in a new country is not spent hunting for a working machine.

What this looks like in practice

The number that decides how far the next top-up has to stretch is what a day in the country actually costs you, and that comes out of the spending itself rather than out of a budget you set in advance. Kapunka records each expense in the currency you paid it in and keeps the home-currency value alongside, so a few days in gives you a daily figure grounded in what you really spent.

Once you have decided how much to take out, it is worth knowing what the withdrawal actually costs you, and once the cash is in your pocket, how to keep count of it across a border. Both sit inside the wider list of costs a budget tends to miss.

How much cash to carry, and how to decide it country by country