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

Regarding the calculation of the base data as of January 1, 2021 to determine the modules of the split payment for this first quarter, it is recalled that in the section on Individual entrepreneurs and professionals - Income from economic activities in personal income tax, by selecting "Split payments - objective estimate" there is an explanatory note that addresses how to calculate it in the different cases that may arise in practice.