The diploma thesis deals with issue of a long-term fiscal sustainability, specifically with fiscal (budget) rules as one of the possible instruments for its support. The main aim of the thesis is to evaluate fiscal accountability rules applied on the municipal level in the Czech Republic and a selected member country of the European Union. Partial aim is to formulate proposals de lege ferenda. Slovakia was selected as a representative of the EU member states because of its historical, economic, juridical and social closeness to the Czech Republic. Asset of the thesis is in detailed analysis of the current Czech and Slovakian acts with respect to financial management of municipalities, their comparison and improvement proposals.