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3 April 2026

Updated Belgian inpatriate tax regime — New circular letter greenlights retroactive adjustments to employment contracts

On 1 April 2026, the Belgian tax authorities (BTA) published Circular letter 2026/C/51, providing commentary on the amendments made by the Law of 18 December 2025 to the special tax regime for inpatriate taxpayers (BBIB) and for inpatriate researchers (BBIO). The changes apply to remuneration paid or granted as from 1 January 2025.  Without providing an overly extensive explanation of the special