https://www.deloitte.com/be/en/services/tax/blogs/retroactive-amendments-to-lump-sum-allowances-for-foreign-business-trips.html
Retroactive amendments to lump sum allowances for foreign business trips | Tax Alerts | Deloitte...
On 27 October 2025, the Belgian tax authorities released Circular Letter 2025/C/70, revising the rules on lump sum allowances for foreign business trips.
lump sum allowances