The most critical exit rule for a Schengen visa in 2026 is the 90/180-day rule, which mandates that travelers from non-EU countries cannot stay within the Schengen Area for more than 90 days in any rolling 180-day period. When exiting, you must ensure your passport receives a "high-fidelity" exit stamp from a border official, as this provides the legal proof that you did not overstay your authorized duration. If you are exiting from a country that uses the new Entry/Exit System (EES), your departure is recorded digitally via facial and fingerprint biometrics, reducing the need for physical stamps but increasing the "high-fidelity" accuracy of tracking overstays. It is vital to exit the zone before midnight on the final day of your visa's validity; overstaying by even 24 hours can result in heavy fines, immediate deportation, and a potential "entry ban" that prevents you from returning to any of the 29 Schengen member states for several years. Always carry your boarding pass as a backup to prove your departure date in case of a system error.