The monthly income tax report, covering both personal income tax (PIT) and corporate income tax (CIT), is a notification sent to the Client summarising entrepreneurs’ tax liabilities for a given settlement period (Act of 26 July 1991 on personal income tax, Articles 44–45, and Act of 15 February 1992 on corporate income tax, Articles 25 and 27). Its purpose is to: summarise revenues and costs; calculate the tax due, taking reliefs and deductions into account; prepare the tax report.