In case of a dissolving of the Chamber of Representatives or in the case of a vacancy, the electoral committee shall meet within 40 days of dissolution or vacancy. The date of the elections is defined through a royal decree.

However, if a vacancy comes up in the three months before the renewal of the Chamber of Representatives, the invitation of the electoral committees can only be decided by the Chamber of Representatives. The same holds true if a vacancy is caused by the resignation of an incumbent or the withdrawal of a substitute. In those two different cases, the possible meeting of the electoral committees takes place within 40 days after the decision.