Icelanders went to the polls on Saturday to decide whether their country should reopen accession negotiations with the European Union — a question that polls suggest is too close to call. The referendum asks a precise but consequential question: not whether Iceland should join the EU, but whether talks should resume. A yes vote would restart negotiations with Brussels, with any final membership deal requiring approval in a second referendum. A no vote would shelve the process indefinitely.

Iceland, a North Atlantic island nation of around 400,000 people, is no stranger to this debate. It opened accession talks in 2010 in the aftermath of the devastating 2008 financial crisis, only to suspend them unilaterally in 2013 following a change of government, and formally asked to be removed from the list of EU candidate countries in 2015. The question has returned to the fore under Prime Minister Kristrún Frostadóttir, whose centre-left government, elected in late 2024, originally planned a referendum by 2027. A rapidly shifting geopolitical landscape accelerated that timetable. Russia's war in Ukraine, heightened tensions in the Arctic, and US President Donald Trump's stated ambitions over neighbouring Greenland — along with his repeated public confusion between Greenland and Iceland — have unsettled Icelanders about their security arrangements. Iceland has no military of its own, relying instead on its Nato membership and a bilateral defence pact with the United States.

Proponents of resuming talks point to two main arguments: security and economic stability. Anchoring Iceland more firmly within European structures, they argue, would provide an additional strategic pillar at a time when US reliability is in question. On the economic front, supporters highlight Iceland's stubbornly high inflation, interest rates recently raised to 8%, and a volatile national currency — and see euro adoption as a long-term remedy. Prices in Iceland run around 84% above the EU average. EU Enlargement Commissioner Marta Kos has said that, if Iceland voted yes, accession talks could be completed within one to two years.

Opponents, however, frame the stakes in terms of sovereignty. Fishing is the central battleground. Fish and marine industries account for nearly 40% of Iceland's exports, and Iceland controls a 200-nautical-mile exclusive economic zone among the Atlantic's richest waters. Under the EU's Common Fisheries Policy, critics fear Iceland could lose control over those grounds. Opposition leader Guðrún Hafsteinsdóttir has vowed Iceland's waters will never be shared. The government insists it would seek a special arrangement to protect fishing and agriculture, pointing to precedents such as Norway's 1994 negotiations and special terms secured by Finland and Sweden. Sceptics remain unconvinced, noting that no EU member state has ever been granted a permanent opt-out.

The result is being watched well beyond Iceland's shores. A yes vote could reinvigorate an EU enlargement process that has largely stagnated for over a decade, and would send a signal — in the words of Commissioner Kos — of "the growing attractiveness of the EU in a rapidly changing world." Norway, a fellow member of the European Economic Area which has twice rejected EU membership in referendums, is following events closely: should Iceland join, Norway would remain the sole Nordic country outside the bloc. For now, Icelanders appear divided almost precisely down the middle, with one poll this week putting the yes camp ahead by just 51.3% to 48.7%.