Belgium's Federal Public Service (SPF) Finance has issued a release on the opening of the Tax-on-web e-service on 28 April 2026 for the filing of personal income tax returns for the 2026 assessment year (2025 income year). General returns are due by 30 June 2026 if filing paper returns, and due by 15 July 2026 if filing electronically via Tax-on-web. Returns concerning specific income types, such as self-employed income, foreign professional income, and certain other income, are also due by …