The best and only official currency to take is the Swiss Franc (CHF). While some larger shops, hotels, and tourist attractions may accept Euros (EUR) in 2026, they will typically give you a poor exchange rate and return your change in Swiss Francs. In the mid-2020s, Switzerland has become heavily reliant on "tap and go" digital payments, but carrying a small amount of cash is essential for rural farm shops, small mountain cafes, or public toilets that charge a CHF 1 fee. For the best value, travelers are encouraged to use a multi-currency travel card like Wise or Revolut, which allows you to spend in CHF at the interbank rate, avoiding the 3-6% conversion fees often charged by traditional banks or physical exchange bureaus at airports.