May 25th, 2026
I. What Was Signed and What Does It Mean?
At the first Mexico-European Union Summit held in eleven years, the governments of Mexico, the European Commission and the European Council today signed, on 22 May 2026, two legal instruments replacing the bilateral framework in place since 2000: the Modernised Global Agreement (MGA) and the interim Trade Agreement (iTA).
The final versions of the MGA and iTA were authorized by all 27 EU member states on 11 May 2026, however, their signature on 22 May 2026 does not imply their entry into force. Rather, their signature authenticates the negotiated texts and formally opens the parliamentary and legislative ratification process in both jurisdictions.
| MGA — Modernised Global Agreement | iTA — Interim Trade Agreement |
| Covers the political, cooperation, trade and investment pillars — including investment protection and the new ICS. Requires ratification by the EU, all 27 member states and Mexico. | Covers matters falling under the EU’s exclusive competence (tariff liberalisation and trade). Enters into force early, following the parties’ internal notifications. |
II. Entry-Into-Force Architecture: A Two-Speed Regime
The agreement operates on a split timeline with materially different practical implications at each stage:
- iTA — early entry into force. The interim Trade Agreement shall enter into force once both parties complete their internal notifications (expected by late 2026 or early 2027) —.
- MGA — multi-year ratification process. The Modernised Global Agreement shall enter into force once it obtains consent from (i) the European Parliament, (ii) the 27 national parliaments and (iii) the Mexican Senate (historically, his process takes several years).
- Provisional application. Notwithstanding that the MGA requires a full ratification to enter into force, certain portions of the MGA may be provisionally applied before, subject to agreement between the parties.
III. Impact on Mexico-Europe Bilateral Investment Treaties (BITs)
Once fully in force, the MGA will replace the 14 bilateral investment treaties currently in force between Mexico and EU member states — covering Germany, Austria, Belgium-Luxembourg, Denmark, Spain, Finland, France, Greece, Italy, the Netherlands, Portugal, the Czech Republic, Slovakia and Sweden. In many of these treaties, investors currently enjoy broader substantive protection than what the MGA provides.
Four aspects of the transitional regime deserve immediate attention:
- The existing BITs remain fully operative. Until the MGA enters into force — or is provisionally applied in a way that covers investment protection — the 14 BITs continue to govern investor-state relations and serve as the basis for arbitration claims.
- Provisional application may suspend the BITs earlier than expected. This is the most consequential, and least discussed, feature of the transitional framework. Article 10.54(2) of the MGA provides that if provisional application extends to the investment protection sections, the BITs are suspended from that date — no national parliament ratification required. That decision rests with the European Council, the European Commission, and in certain cases with the Parliaments of the 27 member states. Investors could therefore find their BIT access cut off well before the MGA completes full ratification. Should provisional application later be discontinued without the MGA entering into force, the BITs would be reinstated; claims arising during the provisional period would nonetheless remain eligible under the MGA.
- Transitional claims window. For breaches that occurred before the BITs are suspended, investors retain the right to bring claims under the relevant BIT, but only if the claim is lodged within three years of the suspension date. Once that window closes, so does the BIT route.
Narrower substantive protection under the MGA. The MGA deliberately tightens investment protection relative to the existing BIT network. The fair and equitable treatment standard is no longer open-ended: it is confined to a defined set of state conduct — denial of justice, serious breach of due process, manifest arbitrariness, and harassment or coercion. The frustration of legitimate expectations, standing alone, no longer suffices to establish a breach. On indirect expropriation, the MGA explicitly carves out non-discriminatory regulatory measures pursuing legitimate public policy objectives — including health, environment, security, consumer protection and cultural diversity — even when those measures negatively affect the profitability of an investment. These restrictions represent a material shift for investors who have structured their claims strategies around broader BIT standards.
Strategic window. The combination of broader BIT protections, the risk of early suspension, and the three-year transitional claims window creates a time-sensitive situation. Investors with potential claims should assess their options under the existing BITs without delay — the available window may prove substantially shorter than the ordinary ratification timeline would suggest.
IV. The New Dispute Resolution Mechanism: From Ad Hoc Arbitration to the ICS
The MGA replaces the investor-state arbitration model with the Investment Court System (ICS) — a standing adjudicative body with a first-instance tribunal and a permanent appeal tribunal.
| Element | Traditional ISDS (Existing BITs) | ICS — Modernised Global Agreement |
| Composition | Party-appointed arbitrators, case by case | 9 judges appointed by Joint Council (3 EU / 3 Mexico / 3 third-country nationals); 3-member panels by random rotation |
| Award review | No appeal (ICSID annulment only) | Standing Appeal Tribunal (6 members); 90-day window to appeal; maximum 270-day process |
| Transparency | Varies by applicable rules | Fully public proceedings; all documents and hearings open by default |
| Consistency on legal precedents | Limited; contradictory awards common | Designed to achieve consistency through binding appellate review |
| Enforcement | ICSID Convention / New York Convention | Framework under development |
| Party control | High — own arbitrators, chosen rules | Low — pre-set institutional framework |
Procedural features that reshape litigation strategy:
- Mandatory consultation and the deemed-withdrawal trap. Before filing a claim, the investor must formally request consultations with the host State — to be held within 60 days of the request. Critically, if the investor has not filed its claim within 18 months of the consultation request, the MGA treats it as having withdrawn. This deemed-withdrawal rule — with no equivalent in traditional ISDS — penalises delay and requires precise scheduling from the outset of any dispute strategy.
- Limitation periods running now. The consultation request must be lodged within 3 years of the date on which the investor knew or should have known of the state conduct at issue and the resulting harm. There is an absolute outer limit of 10 years from the date of the measure, regardless of when the investor acquired knowledge. For claims against the EU or a member state where domestic remedies have been pursued, the three-year period is tolled until those remedies are exhausted — subject to the ten-year ceiling. Because these periods are already accruing against current and recent state conduct, investors should not defer the analysis of potential claims.
- Fork in the road — broader than most BITs. To access the ICS, the investor must withdraw any concurrent proceedings involving the same measures before domestic or international courts and provide a written waiver of the right to initiate new ones. Critically, this obligation extends to the locally incorporated vehicle through which the investment is held and to any other person with an interest in the investment — an expansion that goes beyond the scope of most existing BITs and can disrupt parallel litigation strategies that have been common in investor-state practice.
- Respondent determination in EU-related disputes. Where a claim could be directed at either the EU or one of its member states, the investor must first request the EU to designate the respondent. The EU has 60 days to do so. If it fails to respond within that period, the investor may proceed against the member state directly. This mechanism adds a pre-litigation step with no counterpart in the existing BITs.
- Anti-abuse clause. The tribunal will dismiss claims for lack of jurisdiction where the investor acquired its stake or control over the investment primarily to access the dispute settlement mechanism, provided the dispute had already materialised — or was clearly foreseeable — at the time of that acquisition. Claims tainted by fraud, misrepresentation, corruption or abuse of process are similarly excluded. Investors who have recently restructured in anticipation of a dispute should assess their exposure under this provision carefully.
- Third-party funding disclosure. Any party benefiting from third-party funding must disclose the identity of the funder to the tribunal and the opposing party at the time of filing. Early disclosure — earlier than many funded arbitrations have typically required — conditions the funding strategy and may affect settlement dynamics and the tribunal’s approach to cost allocation.
V. Recommendations for Investors
In light of this new regulatory framework, Basham recommends that clients with existing or projected investments between Mexico and the European Union take the following steps:
- Map the treaties protecting each investment. The 14 BITs currently in force vary meaningfully in their protections — some include umbrella clauses, broader investment definitions, or more expansive MFN treatment not replicated in the MGA. Identifying which instrument provides the strongest basis for each specific investment is the first analytical step.
- Assess potential claims under the existing BITs without delay. The risk of early suspension through provisional application means the available window may be significantly shorter than the ordinary multi-year ratification timeline suggests. Three years from suspension is the hard outer limit for transitional claims.
- Audit corporate investment structures against the MGA’s anti-abuse clause and expanded fork-in-the-road requirement. Structures designed to optimise procedural positioning under the current BITs may need to be revisited in light of the new framework.
- Begin identifying and documenting any state conduct that may give rise to a claim. Limitation periods under the ICS are already running against current and recent measures — waiting for the MGA to enter into force before conducting this analysis risks foreclosing viable claims.
- Track EU institutional decisions on provisional application. The decision about whether to extend provisional application to the investment protection chapter — and thereby trigger BIT suspension — will be taken in Brussels, not in national parliaments, and could arrive earlier than anticipated.
Basham’s Arbitration and Dispute Resolution team is available to analyse the specific impact of this framework on your investments and to advise on claims strategy under the existing bilateral treaties.
Carlos E Martínez Betanzos – Partner in the Arbitration and Dispute Resolution practice area