As of 00.00 on 29 December people travelling to the Netherlands must be able to present a negative COVID-19 test result if they are coming from a high-risk area in the EU/Schengen area by aircraft, ferry or international intercity train or coach travelling more than 30km into the Netherlands from the border.
More information: People arriving from countries in the EU/Schengen area required to present negative COVID-19 test result | Coronavirus COVID-19 | Government.nl