Summary: Ownership interest in the joint property of spouses A thesis target represents above all the clarification of conditions, under which an ownership interest becomes a part of the joint property of spouses, as well as in what manner it can be realized. The accent is also put on questions relating to the treatment of ownership interest, being still part of the joint property of spouses. The position of another partner, not associated in a business partnership, doesn't escape notice, being for example closely connected with the institute of the so-called usual property administration (or administration in a legal context according to the terminology of the new Civil Code) etc. The chosen thesis topic encroaches on both the branch of business law and civil law; consequently both the sources of the two branches are used. In my considered opinion even afterwards, when the new legal regulations will enter into force, the most used jurisdiction and specialized literature stay relevant in light of explanation. However, new regulations also include some provisions, not known by current legal forms, this could unfortunately cause the exclusion of some conclusions of the expert public, having been accepted up to date. That's why the thesis has been elaborated according to the current legal regulations and the...