The capitulaciones matrimoniales, under Article 1771 of the Civil Code, are the agreements that spouses enter into before marriage about the assets they bring and the gifts and concessions they wish to make. They are executed by public deed (Art. 1772), list the assets brought with their value and a statement of each spouse's debts (Art. 1780), and may not go against good morals or the law, nor harm the rights of spouses or descendants (Art. 1773). If nothing is agreed, the sociedad conyugal arises by the mere fact of marriage (Art. 1774). And one rule weighs heavily on planning: capitulaciones are irrevocable from the celebration of the marriage and, once it is celebrated, they cannot be altered (Art. 1778); changes are only possible before the marriage and with the same formalities, and against third parties they require a marginal note (Art. 1779). That is why the decision is made before getting married, not after.
Within the sociedad conyugal, the social estate includes salaries, the fruits and profits of social assets and also of separate assets accrued during the marriage, and assets acquired for value during it (Art. 1781, items 2 and 5). By contrast, inheritances, legacies and gifts belong to the spouse who receives them (Arts. 1782 and 1788); subrogated real estate and items bought with separate funds designated in capitulaciones do not enter (Art. 1783); nor does anything acquired during the partnership when the cause or title preceded it (Art. 1792). Mind the presumption in Article 1795: money, credits, rights and shares in a spouse's hands when the partnership is dissolved are presumed to belong to it, unless proven otherwise; a business owner needs to be able to show which holdings were theirs before the marriage, and to analyze case by case how profits distributed by the company during the partnership are treated. For unions without marriage, Law 54 of 1990 (Art. 2, as amended by Law 979 of 2005) presumes a patrimonial partnership between permanent partners when the unión marital de hecho lasts at least two years and allows it to be declared by public deed before a notary or by conciliation record; the law does not expressly regulate "capitulaciones" for the unión marital. On tax, Article 47 of the Tax Statute provides that what is received as gananciales is not occasional gain, whereas what is received as conjugal portion is. And these tools do not work to put out of DIAN's reach what is already owed to it: on that risk see /insolvencia-fraudulenta-dian; for the full picture, /planeacion-patrimonial.