Ancillary work

There is often no strict divide between our professional and private lives. Sometimes the university may ask you to work more, or to support other activities in a manner not specified in your employment contract. Likewise, you may perform ancillary work in your spare time. The CAO therefore sets out some regulations regarding work outside of your regular employment.

Alternative duties

The university is allowed to ask you to perform alternative duties, but only if it can be reasonably expected of you given your personal circumstances. In the event of a strike, the university cannot ask you to do the work of any colleagues who are on strike.

Ancillary work

If you perform any work outside your job at the university, you are obliged to let the university know. Ancillary work is only allowed with the permission of your employer, who will examine whether it is at odds with the interests of the university. If there is no conflict, you will receive permission to perform this work outside working hours. There is a uniform regulation for the university sector (in Dutch). In addition, your university may determine a procedure or administrative rules for implementation.


To learn more about the agreements regarding overtime, please see the Remuneration page.