Prenuptial agreements enter into force upon the solemnization of the marriage (Art. 182,Swiss Civil Code). Spouses may enter into a marital agreement or modify or annul a prenuptial agreement at any time during their marriage.
Full disclosure of the spouses’ assets and debts is not necessary. However, the general rules of contract law apply, so that a marriage contract might be invalidated by reason of fundamental mistake, fraudulent misrepresentation or duress (Arts 23 et seq. and 28 et seq. Swiss Code of Obligations), or the general rule prohibiting an abuse of a right (Art. 2 para. 2 Swiss Civil Code) may apply.
A marital contract containing provisions regarding the matrimonial property regime, and that does not provide for the other effects of a divorce, qualifies as a marital contract, and is not subject to judicial review for fairness. On the other hand, an agreement intending to lead to a divorce is dealt with differently from a marriage contract and is subject to judicial control (Art. 140, Swiss Civil Code).
The spouses may only choose, change or modify their property regime within the boundaries of the Swiss law, Art. 182 (2), Swiss Civil Code. They may choose between the statutory property regimes. Whichever regime they choose may only be modified in specifically authorized ways and to a specifically authorized extent. The spouses cannot create their own regime. However, they may regulate certain issues regarding property law by a simple written contract in writing, but such an agreement does not qualify as a marriage contract.
Thus, under the property regime of participation in acquisitions, the spouses may deviate from the rules on the participation in the increased value of an asset in the case where one spouse has invested in the other’s assets, Art. 206 (3), Swiss Civil Code.
Under participation in acquisitions, the spouses may designate business assets that would otherwise belong to the marital property as separate property, Art. 199 para. 1 Swiss Civil Code; they may also assign revenue generated from separate property to the separate property (Art. 199 (2) Swiss Civil Code).
Under community of property, the spouses may modify the assets that belong to the common property (Art. 223 Swiss Civil Code).
Foreign decisions relating to marital property relations must be recognized in Switzerland if: