Sweden goes to the polls today, Sunday 13 September 2026, to elect the 349 members of the Riksdag along with its regional and municipal councils. More than eight million people are eligible to vote, and the final opinion polls placed the two blocs within fractions of a percentage point of each other: the last Novus survey for TV4 put the four opposition parties — Magdalena Andersson’s Social Democrats, the Centre Party, the Greens and the Left Party — at 50.3% combined, a lead that Prime Minister Ulf Kristersson’s Moderates, Christian Democrats and Liberals, backed by the Sweden Democrats, had been narrowing through the campaign. With a 4% threshold for representation, the outcome may turn less on which big party finishes first than on whether every small party in each bloc clears the bar.

The defining question is whether the Sweden Democrats, who took 20.5% in 2022 and became the largest party on the right, move from supporting Kristersson’s three-party government from outside under the Tidö Agreement to holding ministerial office for the first time. Kristersson has said they could receive posts if the right keeps its majority, and the Liberals, previously the main internal obstacle, have dropped their categorical opposition. Andersson, prime minister from November 2021 until the 2022 election, is trying to return at the head of a four-party alternative that agrees on more public investment but not on much else. Portugal’s press has covered the campaign closely all week, and Jornal de Notícias reported on Saturday that Portuguese residents in Sweden were uneasy about the anti-immigration tone of the campaign.

Why Portugal has a stake

Sweden is the biggest single Nordic presence in Portugal. NorthSouth HQ’s directory of Nordic companies in Portugal counts some 260 Swedish companies and about €3.1 billion of Swedish investment, the largest of the four Nordic footprints, from IKEA, H&M and Volvo through Securitas and Verisure to Essity’s global shared-services hub in Lisbon. The flow runs the other way too: Portuguese goods exports to Sweden reached €107.3 million in July 2026, up 30.3% year on year, the strongest month of the year after March, according to INE’s country tables, and the best July performance among the four Nordic markets. Systembolaget listed 579 Portuguese products when we read its database on Saturday. None of that is decided by an election, but the frame around it is.

Five things to watch

1. The missing tax treaty. Sweden terminated its double-taxation convention with Portugal with effect from 1 January 2022, after years of dispute over Swedish pensions paid tax-free to residents under Portugal’s old non-habitual-resident regime. Portugal has since replaced that regime with the narrower IFICI scheme for skilled workers and researchers, but no new treaty has been negotiated, and Sweden remains one of very few EU countries with which Portugal has no convention in force. Whoever forms the next government inherits that file. It matters for every Swedish company with staff on Portuguese payrolls, for Portuguese engineers moving to Swedish employers, and for the pension-led relocation market on the Algarve that the old treaty dispute was really about. The termination was driven by a Social Democrat finance ministry in 2021, when Andersson herself held the portfolio, and a returning centre-left government is unlikely to rush a replacement; a centre-right ministry has shown no sign of doing so either. This is the corridor’s single biggest unresolved bilateral issue, and it will not be on any party’s election-night list.

2. Labour migration — the rules versus the climate. Portuguese citizens working in Sweden do so under EU free movement, and nothing on the ballot changes that. The outgoing government’s tightening of work-permit rules for non-EU nationals — including a higher salary floor introduced in late 2023 — does not touch them, and Andersson’s Social Democrats have themselves moved to a far more restrictive line on migration than the party held a decade ago. What Portuguese employers and employees in Sweden are watching is the climate rather than the statute book: the Portuguese engineers, health workers and technicians recruited by Swedish employers move under free-movement rules, but they move only if Sweden is seen as a place worth moving to.

3. Corporate tax and the cost of a Swedish parent. Sweden’s corporate tax rate of 20.6% is already below Portugal’s headline rate, which the Montenegro government is cutting by a point a year toward 17%. The blocs differ on the margins — the right favours further business-tax relief, the left more public spending — and for the 260-odd Portuguese subsidiaries and operations of Swedish groups the relevant variable is less the rate than group-level decisions on where to place shared services, engineering and back-office work. Essity’s Lisbon hub, IKEA Industry’s plants and the nearshoring of Swedish fashion brands’ production into northern Portugal are decisions taken in Swedish boardrooms, and they have tended to accelerate when Swedish labour costs and the krona’s weakness make Portugal look cheaper, whichever bloc governs.

4. Energy and the competition for energy-hungry capital. The Kristersson government made new nuclear power, with state financing, the centrepiece of its energy policy; the opposition parties are split between the Centre Party’s market liberalism and the Left and Greens’ scepticism, though the Social Democrats have not promised to reverse the nuclear programme. For Portugal the question is indirect but real. Sweden’s pitch for green steel, batteries and data centres rested on cheap northern power, and Portugal now sells itself to the same investors as the southern alternative: Start Campus’s chief marketing officer described Sines in August as “the alternative, alongside Scandinavia” for hyperscale capacity, and Norwegian-backed Nscale is building there rather than only at home. A Sweden that commits to more domestic baseload sharpens that competition; a Sweden stuck in an energy-policy argument keeps Portugal’s window open.

5. How long it takes. A preliminary result will be known on Sunday night, but the definitive count takes several days and government formation can take weeks. After the 2022 election on 11 September, Kristersson was not elected prime minister until 17 October. If today’s result is as close as the polls suggest, and if the outcome depends on which small parties clear 4%, a similar interval is likely — and a period in which Sweden’s policy on anything from the EU budget to defence procurement is on hold. For Portuguese exporters planning autumn launches at Systembolaget or bidding into Swedish public tenders, that pause is a fact of the calendar rather than a risk: the monopoly, the procurement system and the courts run on regardless of who sits in Rosenbad.

The corridor view

Elections in Sweden rarely move Portuguese decisions in the short run, and this one is unlikely to be an exception: the trade, the investments and the 579 wines will be there on Monday. What changes with a close result, and above all with a first Sweden Democrat cabinet, is the tone of a country that Portuguese companies have treated as the most predictable of their Nordic markets. NorthSouth HQ will return to the result and to what a new or renewed government says about the tax treaty, labour migration and energy once the count is in.