The 90-day rule, or the 90/180 rule, is one of the most critical elements to understand about travelling in the Schengen area. The rule limits your travel to the region to a maximum of 90 days in any 180-day period.
The rolling basis for calculating the 180 period is vital to understand the rule.
What does ‘on a rolling basis’ mean?
The 180-day rolling period doesn’t need to correspond to a calendar year or any other fixed timeframe. Instead, you must look back at the previous 180 days to determine how much time you’ve spent in the Schengen area.
The 90 days also don’t need to be consecutive. You can spread them out over the 180-day period.
After you’ve spent 90 days within 180 days in the Schengen Area, you must leave. You can return once you’ve spent enough time away to be eligible to stay for another 90 days.
The day count starts from the first day of stay and ends on the last day of stay. The time of your entry and exit doesn’t matter. You could arrive in the Schengen area at 10pm on 4 March, and the day would count as your first day towards the limit.
The detail is significant, as countries sometimes have different ways of determining what counts as a ‘present’ day. We’ve written about the complexities of deciding a day for residency and day count purposes, if you want to learn more. You can read more about it here.
But in the Schengen Area, your 90 days start at the entry date and end at the exit date, regardless.