Election Poll Sweden: Results from SCB on May 28, 2025

According to :institute data, 6 parties are projected to surpass the electoral threshold and enter the Swedish Riksdag: Socialdemokraterna with 137 representatives, Sverigedemokraterna with 74 representatives, Moderaterna with 71 representatives, Vänsterpartiet with 29 representatives, Miljöpartiet with 21 representatives and Centerpartiet with 17 representatives.

Sweden's parliament, the Riksdag, comprises 349 members, elected every four years. The electoral system is proportional representation, with 310 fixed seats allocated across 29 constituencies. To ensure the parliamentary seat distribution accurately reflects parties' nationwide vote share, the remaining 39 seats are distributed as adjustment seats (utjämningsmandat). This system guarantees high proportionality, ensuring nearly every vote directly influences the Riksdag's composition.

To enter the Swedish Riksdag, parties face a nationwide electoral threshold of 4%. Parties must clear this hurdle to participate in seat allocation. However, a crucial exception exists: if a party secures at least 12% of votes in a single constituency, it can win a direct mandate there, even if its nationwide support falls below 4%. In practice, this 4% threshold often proves pivotal for government formation, as the failure of smaller partners can shift the entire balance of power between the left and center-right blocs.

Sweden operates under the principle of 'negative parliamentarism'. A candidate for Prime Minister (Statsminister) is approved unless an absolute majority of members (at least 175) votes against them. An active 'yes' majority is therefore not strictly required. This frequently leads to the formation of minority governments in Sweden, which rely on informal agreements or support parties in the Riksdag. Government formation thus often demands intense negotiation to ensure a government avoids blockage on crucial votes like the budget.