The text discusses the following three issues: basic regulations of economic matters in the Catholic Church, financial regulations related to canonical procedural law and costs directly related to cases of nullity of marriage. The article shows general norms regarding the financial aspects of life in the Church (especially from book II of CIC/83), as well as general and specific norms regulating the financial aspects of conducting processes in the Church (especially from book VII of CIC/83). The final part of the text demonstrates all costs related to conducting cases of nullity of marriage, which include: judicial expenses, advocate and procurator fees, costs of possible experts opinions and assistance of interpreter, as well as possible costs of the parties and witnesses.