Are you married, registered partners or cohabiting or are you going to do so in the near future?
The law regulates many legal requirements if you marry or enter into a registered partnership. If you live together, the law does not regulate anything, however, it is wise to have an agreement and to make it legal. A civil partnership agreement in a notarial deed provides you with several tax advantages.
Even if you are going to get married or have a registered partnership, it may be advisable to make amendments to what the law dictates.