If your employee will be working and living in the Netherlands, you will have to arrange a work and residence permit (‘GVVA’) for them. This will give your employee permission to stay in the Netherlands and do their job.
If your employee will be working in the Netherlands for less than 90 days and will not have an official residence while they are here, they will only need a work permit (‘TWV’). You will have to arrange this permit on your employee’s behalf.
To find out more about Brexit and how this might affect your employee, visit the Brexit page on the Dutch government website.