How many of the negotiating chapters required to join the EU will Montenegro have closed at the end of 2026?

Montenegro’s EU accession chapters at the end of 2026

Executive Summary

The forecast median is 30 provisionally closed chapters, with a 10th-to-90th-percentile range of 29–33. Montenegro is expected to finish most of the remaining negotiations, but closing every chapter depends heavily on Croatian consent and timely formal decisions.

The verified starting point is 23 chapters, following the accession conference on 6 November 2026—not the March baseline of 14 in the original question. Ten chapters remain open.

The central uncertainty is no longer primarily technical readiness. The European Commission judges the closing benchmarks—the requirements for recommending closure—to have been met. The harder questions are whether every EU member state approves the remaining negotiating positions and whether accession conferences formally close the chapters before 23:59 CET on 31 December 2026. Political promises and Commission recommendations do not count as closure.

Key drivers

1. Technical readiness supports a rapid final push

The Commission’s report published on 4 November concludes that all closing benchmarks have been met. Its accompanying roadmap envisages further November closures and a December finish, with the remaining draft EU negotiating positions submitted by mid-November.

This makes a large final batch plausible. Montenegro’s closure history is uneven, with several chapters sometimes closed at one conference. Extrapolating an average monthly pace would therefore understate the possibility of a year-end sprint.

Technical clearance is not unconditional approval, however. The roadmap still depends on member-state agreement, transitional arrangements and the financial package. The Commission also records unfinished implementation work.

2. Croatia is the principal political obstacle

Croatia’s government reported in early November that two of its eight outstanding issues had been resolved, leaving six associated with Chapters 23 and 31. These concern compensation for former Morinj detainees, missing persons, war-crime proceedings, property, the training ship Jadran and border arrangements.

There is evidence of negotiating room. Prime Minister Andrej Plenković distinguished matters under government control from those for which precise completion deadlines cannot reasonably be expected. Croatia’s foreign minister also allowed for maritime delimitation after membership.

But flexibility is not a settlement. The two countries continued to assert incompatible ownership positions over Jadran, and Montenegro’s foreign minister said no new obligations or deadlines had been accepted. The forecast therefore treats a timely agreement as plausible, not assured.

3. One blocked chapter can keep several open

The Council’s negotiating methodology says the two rule-of-law chapters—23, Judiciary and fundamental rights, and 24, Justice, freedom and security—should close last.

Consequently, a continuing hold on Chapter 31, Foreign, security and defence policy, could leave all three open. That creates an important stopping point near the forecast median rather than a finish just one chapter short of completion. The remaining chapter outcomes are therefore linked, not independent.

4. The timetable is credible but compressed

Early-November Council working documents show active consideration of several remaining negotiating positions. A Dutch government letter supports further closures and identifies a possible accession conference alongside the 19 November General Affairs Council, conditional on unanimous agreement.

There is also a December ministerial coordination window. Nevertheless, unresolved transport concerns, financial terms or a late member-state reservation could push formal closure beyond the deadline even after substantial technical progress.

Scenarios

The reasoning gives greatest weight to an on-schedule administrative push. Within that path, the Croatian negotiations largely determine whether Montenegro completes the process or stops short. Delays receive less weight, with a smaller tail for a broader setback.

Implications

• Plan for substantial progress without assuming completion. The median of 30, alongside the 29–33 percentile span, supports continued preparation for the final accession stages while preserving room for unresolved negotiations.
• The final chapters are not interchangeable. A small numerical shortfall could reflect a politically consequential blockage, amplified by the sequencing of the rule-of-law chapters—not a proportionate amount of unfinished technical work.
• Keep negotiating completion separate from membership. The Commission’s roadmap places a proposed accession-treaty signature in June 2027. Even full chapter closure at year-end would not itself mean Montenegro had joined the EU.
• Expect clustered decisions. Formal conference outcomes and member-state consent are more informative than a smooth monthly progress measure or repeated statements of ambition.

Signs to watch

Research and methodology

The forecast relied most heavily on:

• Official closure records: the Council’s 6 November announcement establishes the current count; its Montenegro chronology supports the reconstructed history of formal closures.
• Commission readiness assessment and timetable: the Montenegro 2026 Report supplies the benchmark assessment, while the 4 November enlargement communication and roadmap lays out the intended November–December sequence. The report’s earlier chapter count was superseded by the newer Council conference result.
• Negotiating rules: the Council’s revised methodology establishes the importance of closing Chapters 23 and 24 last.
• Evidence of active preparation: the 5 November working-party agenda and 6 November Dutch government letter show specific files moving through approval procedures, without proving approval.
• Croatian primary statements: the government’s accounts of 22 October and 4 November establish both the unresolved demands and the scope for negotiation.

The research reconstructed the dated closure history and used a chapter-level probability model. It allowed for shared conditions affecting the whole timetable, linked Croatian-sensitive chapters, the close-last rule and a small reopening risk. The assumptions were judgmental, not historical frequencies fitted to a large sample.

Limitations

The most valuable missing evidence was a verified bilateral settlement, formal withdrawal of Croatian reservations and agreed final conference positions. The current status of the reported transport reservation remained unclear: its absence from Croatia’s latest public list did not establish that it had been withdrawn.

Final adoption of constitutional amendments concerning ministerial immunity and integrity checks was also not verified. These gaps matter more than the numerical precision of the model and leave the forecast particularly sensitive to late political announcements.