europa.euCarrying cash
If you plan to enter or leave the EU with EUR 10 000 euros or more in cash (or the equivalent in other currencies) you must declare it to the customs authorities. Failure to do so could result in your cash being retained by the customs authorities, and you may receive a fine. Be aware that the customs authorities may carry out individual checks as well as checks on your baggage and/or vehicle.
If you want to travel between EU countries with EUR 10 000 euros or more in cash (or the equivalent in other currencies), you must check with the customs authorities in the countries you are leaving, entering and passing through whether you must declare it.
How to declare?
ec.europa.eu