Foreign scientists recently have given more attention to problematic questions of corporate income tax connection with financial accounting, and have also emphasized financial accounting importance to tax law. However, despite the fact that there are some publications which assess transactions for financial accounting and taxation purposes in practical view in special press, there is less scientific research on corporate income tax connection with financial accounting. As a consequence, this article aims to reveal the connection between legal regulation of financial accounting and taxation on corporate income tax. Publication analyzes legal relationship between financial accounting and corporate income tax, scientific literature about the article topics and pragmatic (practical) disclosure of connection between financial accounting and corporate income tax. The result of the article shows that these two elements are strongly connected and the analysis of their legal relationships could simplify the administration of tax burden of corporate income tax.