Any modern scientific study of the problems of socio-economic development, and especially of such complex and dynamic phenomena as the development of the banking services market, requires the development of scientific approaches, methodology, and modern research methods for their analysis and forecast. The purpose of this study was to develop theoretical approaches and methodology for researching this market, to clarify the methodology for analysing the banking services market, and to calculate its total capacity for Ukraine. The study was mainly theoretical and methodological, and therefore general scientific methods were employed: deduction (for the general logic of the study), analysis (for the classification of market segments), comparative analysis (for clarifying the conceptual apparatus), and induction (for drawing conclusions). The special research methods included statistical methods (analysis of dynamic series, structural analysis to calculate the capacity of the Ukrainian banking services market and its segments). The study clarified the terminology – “banking service”, “banking services market”, proposed to divide the banking services market into active and passive segments for an in-depth study of the market conditions and factors influencing them in each of these segments, developed a methodology for calculating the capacity of the main segments of this market with consideration of Ukrainian banking statistics. The capacity of the passive and active banking services segments of Ukraine was calculated, which helped to calculate the total capacity of the market for basic banking services, as well as to determine Ukraine’s place in the global market and to identify the most influential factors affecting the situation. This study was the first to calculate the capacity of the Ukrainian banking services market in terms of value for 2018-2024 and outlined measures for its development for the future until the end of the war and for the post-war period. The practical value of this study is that the author’s approach to the methodology for calculating the capacity of the key market segments can be used for other segments
theoretical and methodological foundations; system analysis; market capacity; bank deposit services; bank lending services; segment analysis of the market