Portugal’s Supreme Administrative Court ruled on 25 February 2026 that foreign-source income is generally subject to municipal surcharge (derrama municipal) unless linked to a foreign permanent establishment, overturning a lower tribunal’s decision in a case involving interest from foreign debt securities.
Portugal’s Supreme Administrative Court has ruled that foreign-source income is generally liable for municipal surcharge unless it can be attributed to a foreign permanent establishment.
The judgment, issued on 25 February 2026, followed a case brought by a Portugal-resident company challenging the surcharge on interest income from debt securities issued by foreign entities.
The company argued that the income, earned entirely outside Portugal, had no territorial link to any Portuguese municipality and should be excluded from the surcharge base. While a tax arbitration tribunal initially sided with the company, the Supreme Administrative Court overturned that decision
The Court confirmed that all income, including foreign-source interest, must be included in the municipal surcharge calculation unless it is objectively connected to a foreign permanent establishment.
The ruling is now part of the official acórdãos records, the high court’s legal archive for administrative law decisions, providing binding precedent for similar taxation cases.
