Belgium has published a notice from the Federal Public Service (SPF) Finance in the Official Gazette that includes an explanation of the rules on advance income tax payments for the 2018 tax year (2019 assessment year).
Advance Tax Payment Schedule
Advance tax payments are due quarterly. For 2018 (assessment year 2019), the standard payment deadlines are 10 April 2018, 10 July 2019, 10 October 2018, and 20 December 2018. For tax periods not following the calendar year, the payment deadline…