Belgium's Federal Public Service (FPS) Finance has issued a release confirming a change in the standard deadline to file top-up tax returns under the supplementary national tax rules (Belgium's QDMTT). This follows the publication of the Law of 25 October 2026 for the implementation of Council Directive (EU) 2025/872 of 14 April 2025 (DAC9) in the Official Gazette on 30 October 2026, which also changed the standard deadline to file top-up tax returns. As provided by the law and confirmed by…