There is no minimum time during which two persons must have lived together in order to qualify as a cohabitation couple. The important thing is that the persons have had the intention to live together. If they cannot agree on whether they are a cohabitation couple, as a main rule, they are considered a cohabitation couple if they are registered at the same address or otherwise, if they have lived together for at least six months, if they have common children or if they have a mutual will.