Do I need a passport or visa to enter?
Liechtenstein is part of the Schengen area, and extends visa-free entry to U.S. citizens for up to 90 days (consecutive or combined, within any six-month period) for tourist or business purposes. Your passport should be valid for at least six months beyond your period of stay. You need sufficient funds and a return airline ticket. For additional details about travel into and within Schengen countries, please see our Schengen fact sheet.
Liechtenstein does not have a bilateral agreement with the United States that would allow a U.S. citizen to stay longer than 90 days within the Schengen area in any 180-day period. Thus, when you travel to Liechtenstein, you should make sure that you have not yet exhausted the 90 days within a 180-day period of legal stay in the Schengen area since your first entry into the Schengen area, regardless of other bilateral agreements. If you exceed the 90-day stay, you risk being fined or even banned from entering the entire Schengen area again for six months or longer.
If you are planning to stay longer than the 90 days in Liechtenstein, make sure to obtain a visa from the Liechtenstein Embassy before you leave the United States. This will assist you in avoiding any problems when departing Liechtenstein.