Corporate capital structure has been the subject of extensive research in the lastdecades. The article briefly examines the existing theories of corporate capital structure.However, applying those concepts in practice has brought mixed results. This study isanother attempt to determine capital structure in selected companies as well as analyzeimpact of the pre-defined debt level on effectiveness of economic entity. Variables like sizeand sector and their influence on debt-raising ability have also been verified. 10 companiespermitted to trade on NewConnect stock market constituted the sample for this study.