How do quarterly advances work?

The quarterly advance tax payments work as follows:

If a mandatory declaration leads to an adjustment of taxes for the previous year, the tax authority may require the taxpayer to make quarterly advance payments throughout the current year.

These payments are due on March 10th, June 10th, September 10th, and December 10th, and represent one quarter of the previous year's tax adjustment.
During a first tax adjustment, the taxpayer must pay the tax for the previous year as well as quarterly advance payments for the current year.

These payments concern only taxpayers with a flat-rate withholding tax (15%, 21%, or 33%). They no longer apply to non-resident taxpayers who have opted for joint or individual taxation.
They are relevant for married resident taxpayers and for unmarried taxpayers, whether resident or non-resident, with multiple sources of income.

In case of changes in income, situation, or deductible expenses, the taxpayer can request a modification of the quarterly advance payments by providing specific arguments and the desired amount.

Updated on: 13/02/2024