Terminating an employment contract may be the result of a mutual agreement between employee and employer, or it can be a unilateral decision. Whatever the reason, both the employer and the employee have to comply with certain administrative formalities.
On the website of the Federal Public Service for Employment, Labour and Social Dialogue, you can find all information on terminating an employment contract. The website of 1819.brussels also provides detailed information on employment contracts, and how to terminate them.