Belgium's Federal Public Service Finance recently issued a release announcing that the standard deadline to file top-up tax returns under the supplementary national tax rules (Belgium's QDMTT) will be changed as part of the draft law for the implementation of Council Directive (EU) 2025/872 of 14 April 2025 (DAC9). Under the current rules, the standard deadline for submitting the QDMTT return is the last day of the 11th month following the close of the fiscal year. According to the release, …