How does the 2026 UK/EU Treaty affect Gibraltar’s tax incentives under state aid rules?

Short answer

The Treaty brings Gibraltar’s tax measures within a structured state aid framework where they affect EU–Gibraltar trade or investment. Selective tax advantages may require notification, assessment under EU-derived criteria and publication, restoring a level of scrutiny of fiscal incentives comparable to that which applied while Gibraltar was in the EU.

Detailed answer

Because Annex 18 incorporates EU concepts of state aid, including the notion of selective advantage, certain tax rulings or incentives could qualify as aid. Article 203 imposes transparency requirements, and Article 205 generally requires prior authorisation by an independent authority.

Comparison with the pre-Brexit position

Before Brexit, Gibraltar’s tax measures were already subject to EU state aid rules and were investigated by the European Commission. The Treaty re-establishes a comparable discipline, now operated through a Gibraltar-facing independent authority rather than directly by the Commission.

The Treaty does not change the territorial basis of Gibraltar’s direct taxation.

Status: the Agreement has been provisionally applied since 15 July 2026, pending formal ratification.