Where should I file my declaration if I’m travelling by airline?

Where do you file a declaration at an airport if you are carrying € 10,000 or more in cash or securities?

On arrival in the Netherlands from a non-EU country

File your declaration by reporting to Customs in the 'red channel' (goods to declare). Inform Customs that you wish to declare liquid assets.

On departing from the Netherlands for a country outside of the EU

File the declaration before you go through passport control and the security check!

Schiphol: File the declaration at Customs in departure hall 3 (Office Tax Refund/VAT refund)
Other airports in the Netherlands: go the Customs office and file the declaration.

Violations

What happens if you are carrying more than € 10,000 in liquid assets but fail to make a declaration or make a complete or correct declaration? In that case you risk facing a minimum fine of € 1,000 and a maximum fine of € 21,750 or a term of imprisonment.