Managers of business entities must consider tax regulations in their decision-making processes. If the tax system is characterised by high tax rates, the following effects should be expected: a weakening of the economic growth rate, the development of the economic “grey zone”, the outflow of capital abroad while limiting the inflow of external capital. With regard to enterprises, three basic economic effects of taxation can be distinguished: in terms of liquidity, property and organisation. The article discusses models of theoretical forms of reducing the tax burden, thus drawing attention to the significant role of tax planning by business entities, in the context of both the domestic and the international markets.