Modules: Calculation of the Q1 2021 personal income tax instalment payment

In relation to the calculation of the base data as of January 1, 2021 to determine the modules of the installment payment of this first quarter, it is remembered that in the section of Individual entrepreneurs and professionals - Income from economic activities in personal income tax, selecting "Payments fractional - objective estimation" there is an explanatory note that addresses how to carry out their calculation in the different assumptions that may occur in practice.