Legal Framework

The legal architecture of the EU-MERCOSUR and EFTA-MERCOSUR agreements reflects two distinct philosophies of international economic law. On one side, the European Union opted for an unprecedented split between a comprehensive association agreement (EMPA) and an interim trade agreement (iTA), responding to the political need to accelerate the entry into force of trade provisions without waiting for ratification by all 27 member states. This split, based on the distinction between exclusive competence (Art. 207 TFEU) and shared competence (Art. 217 TFEU), constitutes a major precedent in EU treaty practice.

On the other side, EFTA maintained a classic approach with a single, intergovernmental free trade agreement where each member state retains its trade sovereignty. The structural advantage of the EFTA FTA lies in its Chapter 9 on investment — a substantive area absent from the EU iTA and deferred to EMPA whose entry into force remains uncertain. For businesses planning direct investments between Europe and MERCOSUR, this asymmetry creates an immediate competitive advantage for EFTA States, particularly Switzerland.

The referral of EMPA and iTA to the Court of Justice of the European Union by the European Parliament (21 January 2026) adds a considerable layer of legal uncertainty. The CJEU opinion, expected within at least one year, will address the agreements' compatibility with EU Treaties, particularly regarding competence allocation and the procedure followed. If the Court finds incompatibility, the agreements will need to be amended before they can enter into force. Meanwhile, the European Commission announced on 26 February 2026 that it would proceed with provisional application of the iTA, creating an unprecedented legal situation where an agreement is simultaneously subject to compatibility review and provisional application.

For practitioners of international trade law, this duality of agreements requires systematic cross-reading. The economic operator wishing to optimise their access to MERCOSUR must evaluate, for each transaction, which agreement offers the most favourable conditions: the EU iTA for volume and geographical indications, the EFTA FTA for investment and bilateral flexibility. This complexity is precisely what makes specialised legal guidance indispensable, capable of navigating between the two treaty architectures and identifying exploitable synergies.