For U.S. citizens, entering Switzerland in 2026 involves two primary requirements: a valid passport and, starting in late 2026, an ETIAS (European Travel Information and Authorisation System) authorization. Your U.S. passport must be valid for at least three months beyond your planned date of departure from the Schengen Area (which includes Switzerland) and must have been issued within the last 10 years. For short-term stays of up to 90 days for tourism or business, U.S. citizens do not need a traditional visa. However, the ETIAS is a new mandatory digital pre-travel requirement for all visa-exempt travelers. You must apply online or via a mobile app before your trip, providing personal details and answering security questions; the fee is €7 (though those under 18 or over 70 are exempt). Once approved, the ETIAS is electronically linked to your passport and is valid for three years. Additionally, while not a legal requirement, travelers are often asked for proof of sufficient funds and a return or onward ticket to ensure they do not intend to overstay the 90-day limit.