Switzerland is in the Schengen travel area but not the European Union, and its money is the Swiss franc. That distinction becomes visible at tourist counters that display both CHF and EUR. Euro acceptance is a merchant convenience, not a national conversion to the euro, and the change often comes back in francs.
Put the three borders in one wallet
A double price tag is not a fixed exchange rate
Switzerland Tourism notes that prices are often displayed in euros and francs and that many places accept euros, usually returning change in CHF. The merchant still decides the retail conversion. Ask for the CHF total or use a card charged in CHF instead of assuming the displayed euro figure follows the live market rate.
The payment screen has its own border crossing
Liechtenstein makes the franc a two-country currency
The 1923 Customs Treaty tied Liechtenstein closely to Switzerland's economic area, and the principality made the Swiss franc its official currency in 1924. Today the countries form a common economic and monetary area with open borders. A CHF note withdrawn in Zurich needs no exchange counter before Vaduz.
Euro notes can create two conversions at once
Paying a Swiss bill with euro cash can produce a merchant exchange rate on the purchase and Swiss-franc change you later convert again. That may be acceptable for convenience, but it is rarely the clearest way to understand cost. Keep remaining euros for the euro area and make the Swiss portion of the trip visibly CHF.
A familiar franc symbol still needs a code
Prices may use CHF, Fr. or a local-language form. The same franc is called Franken in German, franc in French and Italian, and franc in Romansh. Use the ISO code CHF in notes and budgets when a multi-country itinerary also touches euros, pounds or another currency.
One rough benchmark is more useful than false precision
Learn the approximate home-currency value of CHF 10, 50 and 100, then refresh it close to travel. The franc floats, card markups vary and mountain prices can be genuinely high. A simple benchmark helps distinguish exchange-rate surprise from the ordinary price of a Swiss meal or railway.