The influence of corporate income taxation on financial statements presented on a domestic accounting standards basis differ by countries in a wide range. Corporate income taxation in Hungary has a strong connection to the Hungarian Accounting Act. From 2016 it is prescribed or allowed for specific companies to present their financial statements on IFRS basis. The transition represented not only a challenge in the accounting system of the companies, but the state had to face new tasks because the taxation of IFRS companies had to meet the tax principle of horizontal equity and ensure the proper tax revenue. Research data arise from financial statements of Hungarian companies listed on the Budapest Stock Exchange. The average effective tax rate of Hungarian listed companies decreased after the transition. Temporary tax rules for IFRS companies were applied to reach the tax level of the companies that prepare their financial statements following the Hungarian Accounting Law. Authors compare the results with empirical findings of other European countries.