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If you are going to employ an EU/EEA national who has not yet registered with the police, you must provide your worker with an employment certificate (pdf, 1,0 MB) or an employment contract with the same information as the employment certificate. The employee must present the certificate or contract to the police when registering.
Employees have to register themselves. You can help your worker by filling in the application and booking an appointment with the police, but the employee must show up in person to meet with the police. Read the requirements and go to the application form (choose the applicant's citizenship first).