Sweden's Kristersson to step down after narrow centre-left win

What happened

Sweden faces negotiations over a new government after Ulf Kristersson announced he would leave the prime minister's office following an election defeat. The completed count gave the opposition enough seats to end his conservative-led administration's parliamentary majority.

The result divides the 349-seat parliament almost evenly: four opposition parties hold 176 seats, while the four parties in or backing the outgoing government have 173. A majority requires 175 seats, leaving the winning side little room for disagreement.

Magdalena Andersson, leader of the Social Democrats and a former prime minister, will attempt to assemble the support needed to return to office. Her party secured 99 seats, more than any other, but far short of the number needed to govern on its own with a majority.

The opposition's advantage remained unsettled until officials processed early votes that had not reached polling stations by election day. Ballots cast overseas were among those included in that final stage of the count.

Once the final totals were declared, Kristersson used a letter published on X to announce his decision to step down. The outcome opens a government-building process rather than automatically installing Andersson or putting all four opposition parties into the cabinet.

The background

Andersson lost the premiership in 2022. Her route back now depends on cooperation across a bloc whose members agree on opposing Kristersson's administration but differ over which parties should serve together in government.

The Social Democrats' position illustrates the distinction between winning the most seats and improving an electoral performance. Although they remain the largest parliamentary party, their total is eight lower than in the previous parliament.

Kristersson governed through a centre-right coalition of three parties. Its ability to command parliament depended on a fourth party, the Sweden Democrats, which provided support from outside the cabinet rather than holding ministerial posts.

The Sweden Democrats campaign against immigration and have roots in the far right, although the party has moved closer to the political mainstream. Kristersson had offered the prospect of cabinet participation if his side won another term, making the election significant for the party's access to executive power.

Instead, the Sweden Democrats finished behind Kristersson's Moderates in third place. Their 62 seats represent a loss of 11, weakening a party that had been essential to the outgoing administration's parliamentary position.

On the opposition side, the Center Party's refusal to govern alongside the Sweden Democrats helped determine its alignment with the left. That stance does not translate into support for every possible coalition led by Andersson: it also opposes entering government with the Left Party.

This creates a distinction between the election's two competing camps and the combinations that could actually share ministerial responsibility. An agreement to support a prime minister, or to allow one to take office, need not mean an agreement to join that prime minister's cabinet.

How Sweden forms a government

Sweden elects a single parliamentary chamber, the Riksdag, through proportional representation. Unlike Westminster's constituency-by-constituency first-past-the-post system, the Swedish system seeks to reflect parties' shares of the vote in the allocation of parliamentary seats.

That makes negotiations between parties an important part of determining who governs. The public elects parliament, rather than directly choosing a prime minister, and the largest party does not receive an automatic right to form the administration.

The parliamentary Speaker consults party representatives before proposing a candidate for prime minister. The nomination then goes before MPs, who decide whether the proposed leader can take office under Sweden's system of negative parliamentarism.

Under that system, a nominee is rejected if at least 175 MPs vote against them. The candidate does not have to secure 175 affirmative votes: abstentions can therefore allow a government to be formed even when it lacks an outright majority of committed supporters.

The distinction matters for parties reluctant to share a cabinet. They can refrain from blocking a prime minister while retaining their independence, although accepting an administration's formation does not commit them to supporting every subsequent decision.

Ministerial appointments and parliamentary backing are consequently separate questions. A smaller governing coalition may depend on agreements with parties outside it, covering matters such as budgets or legislation, rather than bringing all its supporters into government.

What people are saying

In her victory remarks on Thursday, Andersson presented the outcome as a mandate to change the country's political course. She emphasised social cohesion, arguing that voters had chosen a more united country over divisive politics.

Spanish Prime Minister Pedro Sánchez welcomed the result on X. He interpreted it as renewed support for public welfare, social justice and environmental priorities after four years in which Sweden's right governed with backing from the far right.

Sánchez leads one of Europe's relatively few left-wing governments, giving his response a wider political context. His endorsement focused on the direction he believed Swedish voters favoured, rather than on a particular coalition arrangement.

Kristersson had said on election night that he would respect Andersson's opportunity to build an administration. At the same time, he drew attention to the difficulties she would face in reconciling the different positions within the opposition.

On Thursday, his emphasis was on discussions extending to all parties to overcome political impasses. He argued that resolving those disagreements would be necessary to produce a government able to operate stably and effectively.

What happens next

The earliest parliament can vote on a new prime minister is 29 September. That makes the immediate task one of negotiating sufficient parliamentary acceptance for a candidate, rather than treating the election result as the completion of the transfer of power.

Andersson's choices involve both the membership of a prospective cabinet and its relationship with parties remaining outside. The Center Party's objection to serving with the Left Party makes those two strands of negotiation particularly important.

An arrangement crossing the traditional left-right divide would bring its own complications. The seat totals establish the balance between the electoral blocs, but a workable administration will depend on which parties can accept a common programme or tolerate a government they do not join.

Some major international commitments command support across Sweden's political divide. These include assistance for Ukraine and membership of NATO, limiting the extent to which a change of government represents a break in the country's established security direction.

Sweden entered NATO in 2024 as its 32nd member and remains the alliance's newest participant. It is also a European Union member, with a population of about 10.6 million, placing the government-building talks within both European political and transatlantic security institutions.

Why this matters

For the UK, Sweden is a fellow NATO ally. Cooperation within the alliance, including collective defence, provides a direct connection between Swedish security decisions and British interests; the broad Swedish agreement on NATO and Ukraine is therefore relevant beyond the election's domestic winners and losers.

For British businesses trading with Sweden, the change of prime minister does not itself rewrite the rules governing commerce with an EU member. Decisions by the next Swedish administration will also sit alongside European rules, making its eventual programme more practically significant than the identity of the election's largest party alone.