The subjective accounting systems leaning against the Polish balance law are a source reliable information about the economic-financial situation of enterprises. In the article were characterized the changes of accountings system in Poland to the effect of changes of the EU law and their influence on the system of the accounting of enterprises ranked among the sector of small and medium enterprises (SMEs). They showed that major simplifications of the procedures concerning the manner of keeping records of business transactions and drafting the simplified financial statement were doing good to fmancial results and increasing the competitive-ness SMEs. Accounting system of SM Es regulated by the Polish Accounting Act is being built in into the model of the "agile" enterprise and enables it to achieve the status of "elastic" enterprise in every area of conducted activity.