The purpose of the research is to provide a comprehensive analysis of aggregate capital as a guarantor of financial stability of the banking system.

The methodology of the research - the study provides theoretical information on the role of aggregate capital in the activities of banks, an analysis is conducted based on a number of financial indicators of Pasha Bank and Kapital Bank.

The practical importance of the research - the correct formation and management of aggregate capital directly affects the activities of banks, and this situation allows creating financial stability both in banks and in the economy as a whole.

The results of the research consist in the analysis and assessment of the mechanism of influence on increasing financial stability and sustainability of aggregate capital of commercial banks.

The originality and scientific novelty of the research - this study reflects the role of aggregate capital in the banking system, an analysis of the relevant financial indicators is conducted using the example of Pasha Bank and Kapital Bank.

Keywords: bank, aggregate capital, primary capital, additional capital, sustainability, credit.