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Schengen 90/180
How the Schengen 90/180 rule works
How the rolling window slides
The 180 day window is not a fixed period. It slides forward every single day. On any given date, immigration looks back 180 days and counts how many of those you spent in the Schengen Area. If the count hits 90, your allowance is used up. People often think they can stay 90 days, leave for 90 days, and come back for another 90. That is not how the rolling math works. After a full 90 day stay, you have to wait roughly 90 days outside Schengen before a completely fresh allowance comes back.
A worked example
Say you enter Spain on January 15 and leave on April 14. That is exactly 90 days, so from April 15 onward you have zero allowance. By July 14, your January days are more than 180 days old and start falling off the back of the window. You gradually regain allowance as old days age out; you do not jump back to a fresh 90 the day you cross the border.
Which countries are in (and which are out)
The Schengen Area covers 29 European countries that have abolished border controls between each other. Days in any of them count toward the same 90 day pool. That includes France, Germany, Spain, Italy, the Netherlands, and all the smaller members. A few European countries are deliberately outside. Ireland runs its own immigration regime, and Cyprus is an EU member that has not fully joined Schengen. Iceland, Liechtenstein, Norway, and Switzerland are inside Schengen despite not being EU members, so they count too.
The mistakes that get people fined
Both the day you enter and the day you exit count as days present, even if you only land in the evening or leave at dawn. Layovers can count if you pass through immigration. A long stay national visa (type D) or a residence permit for one specific Schengen country exempts your time in that country from the 90/180 cap, but not your stays in the other 28. And the count restarts at zero only after enough old days have aged out, not on January 1.
What overstaying means
Consequences vary by country, but the common ones are fines (several hundred to several thousand euros), entry bans that can block you from any Schengen country for a period, and complications on future visa applications across the whole area. Border officers do check passport stamps on exit. If your stamps show more than 90 days inside the window, expect questions at a minimum.