The aim of this paper is to determine the effect of funding sources on liquidity of companies in selected sectors in the Czech Republic from 2000 to 2015. With the purpose to fulfill the aim, we examine existence and character of relationship between selected financial factors (debt equity ratio, return on equity, share of fixed assets to total assets, share of earnings before interest and taxes to total assets) and liquidity of the companies in sectors such as mining and quarrying, manufacturing, construction, service sector and energy sector. The existence of relationship between financial factors and liquidity of companies is tested by correlation analysis and regression analysis. The results show that there is the negative impact of share of fixed assets to total assets on liquidity of companies in service sector in the Czech Republic. The liquidity of companies was positively influenced by the return on equity and negatively influenced by debt equity ratio in energy sector in the Czech Republic.