Schengen is irrelevant, that only concerns border checks. Customs rules depend on whether you’re crossing the EU border or not. You need to declare cash about 10k euros when entering or leaving the EU. No declaration is generally needed for travel within the EU.
Comments
Plane, car, bike, boat, walking doesn’t matter.
What matters is the rules of the individual countries.
If traveling to Denmark, yes, you must declare.
Edit:
Source
https://europa.eu/youreurope/citizens/travel/carry/carrying-cash/index_en.htm
Schengen is irrelevant, that only concerns border checks. Customs rules depend on whether you’re crossing the EU border or not. You need to declare cash about 10k euros when entering or leaving the EU. No declaration is generally needed for travel within the EU.
No.
You must declare cash of €10,000 or more:
This rule is set by EU Regulation 2018/1672.