Can I just stay out for a week and come back?

No. The 90/180 rule is a rolling window. If you have been in Schengen for 90 days, you must remain outside the zone for 90 days before your 'allowance' resets.

Do I need to show proof of funds?

Yes, border agents in both Schengen and non-Schengen countries may ask for proof of funds, typically a bank statement showing roughly $50 per day of intended stay.

How to plan a Schengen visa run

A visa run for the Schengen Area requires leaving the 29-member zone for at least 90 days after exhausting your 90-day allowance. You must physically exit the zone, record your exit with border control, and remain in non-Schengen countries before re-entering.

Calculate your exact exit date. Use a Schengen calculator to find your '90th day.' You must cross a border out of the Schengen zone before or on this day to avoid overstaying.
Select your non-Schengen base. Pick a country outside the zone with a lower cost of living or different visa rules. Popular choices include Albania, Montenegro, Georgia, or the UK (though the UK has its own 6-month visitor limit).
Verify your exit stamp. When crossing the border (by land, air, or sea), ensure the border officer stamps your passport. This stamp is your only proof of exit if you are questioned upon return.
Keep digital records. Save your boarding passes, bus tickets, and accommodation receipts during your time outside the Schengen zone. These serve as secondary proof of your location during your '90-day out' period.

Can I just stay out for a week and come back?: No. The 90/180 rule is a rolling window. If you have been in Schengen for 90 days, you must remain outside the zone for 90 days before your 'allowance' resets.
Do I need to show proof of funds?: Yes, border agents in both Schengen and non-Schengen countries may ask for proof of funds, typically a bank statement showing roughly $50 per day of intended stay.