As a rule, upon concluding a marriage between the spouses, statutory community of property arises. Within this system, we distinguish joint property of spouses and their personal property. However, the Polish legal system allows spouses to opt out of the statutory property regime and adjust the regime applicable between them to their needs. Pursuant to the legal norms of the Family and Guardianship Code, the spouses may extend, limit or abolish the indicated statutory community (by establishing property separation or property separation with equalization of the acquis). Such effect is caused by concluding a marriage contract before a notary public. Due to the significant effects of concluding the agreement in question, the legislator stipulated that it must be in the form of a notarial deed. Failure to comply with this form renders the contract invalid. It should be noted that the conclusion of the said contract may take place both before and after the marriage and is dependent only on the unanimous will of the parties. The extension of the statutory community of ownership consists in contractually defining which of the components of the spouses’ personal assets will be covered by their joint property. It should be pointed out, however, that such an instruction is not admissible with respect to certain personal assets enumerated in the relevant regulations. Limitation of statutory community of property consists in the contractual exclusion of certain, specific components from the joint property of the spouses. However, such an exclusion may not cover all components of joint property. As already indicated, the abolition of statutory joint ownership may take the form of establishing property separation or property separation with the equalization of the achievements. A characteristic feature of the system of matrimonial property separation is the lack of joint property of the spouses. All property items acquired both before and after the conclusion of the contract belong to the respective personal property of the spouses. The regime of property separation with the equalization of earnings, during its duration, is no different from the full separation discussed above. Significant differences become apparent with the termination of the above-mentioned system, because then, between the spouses, the obligation to equalize the earnings arises. The choice of the system in question allows for the protection of the spouse who had less opportunities to multiply his property during the marriage. If the spouses come to the conclusion that the property regime chosen by them by agreement does not correspond to their current needs, they may decide at any time to amend or terminate the marriage contract. If the agreement in question is terminated while the marriage is still ongoing, and the spouses do not agree otherwise, a statutory community of property arises between them.