Slutskattebesked and restskatt: what newcomers to Sweden need to know
My first slutskattebesked arrived by post on a Thursday morning in August 2023. Brown envelope, Skatteverket logo. I'd submitted my inkomstdeklaration (income tax return) in May and hadn't given it a thought since. When I opened it, I saw a single figure in bold: 14,732 SEK. Restskatt, tax owed. Plus an interest charge of 187 SEK that had been running since February 2023, five and a half months before I even knew I owed anything.
That was my lesson in the Swedish tax system. If you come from a country like Germany and get to know the Swedish tax return as the "simpler" one (which it is), it's easy to overlook the second act: the slutskattebesked. The final tax assessment that arrives three to four months after the return and has the last word on what you owe the state or get back.
In this article I explain when the slutskattebesked arrives, what's in it, how to avoid restskatt and why the Swedish interest trap is the most expensive detail that hardly anyone explains to newcomers.
What is the slutskattebesked?
The slutskattebesked is Skatteverket's final tax assessment. It arrives three to four months after the inkomstdeklaration and sets out:
What you actually owe in tax for the previous year (slutlig skatt)
What you've already paid through the monthly deduction from your salary (preliminärskatt)
The difference, either as a refund (återbäring) or as an additional demand (restskatt)
Compared with its German equivalent, which is what I knew before, the notice is short: usually one page, clearly structured, without the endless appendices. That makes it deceptively simple.
When does the slutskattebesked arrive?
Skatteverket sends out the assessments in several waves, depending on when you filed and whether your return goes through without corrections:
June wave: if you filed electronically and early (before the end of March) and everything was accepted without changes, the slutskattebesked arrives in early to mid-June. The återbäring is then often paid out by mid-June.
August wave: if you filed in April or by the 4 May deadline, you usually get the assessment in August.
September to December: for the self-employed, corrections or more complex cases (K4 for capital gains on shares, K10 for dividends from an aktiebolag, foreign income), processing drags on into late autumn.
If you have an account on skatteverket.se with BankID, you'll see the assessment digitally as soon as it's ready, usually two to three days before it arrives by post.
Återbäring: when the money arrives
If your employer withheld too much income tax (which happens often, because the tax table is calculated conservatively), you get an återbäring back. The money goes to the account you've registered with Skatteverket. You have to register that account yourself beforehand, otherwise the money comes as a payment slip by post (awkward, several weeks' delay).
Registering your account: on skatteverket.se under "Mina sidor" → "Skattekonto" → "Anmäl konto för utbetalning". Takes two minutes with BankID.
A typical återbäring for employees with normal figures: 2,000 to 8,000 SEK. If you buy property (stämpelskatt deduction), have children or use the ROT/RUT deduction, you'll often see more.
Restskatt, and the interest trap
If you've paid too little tax, Skatteverket claims the difference. No drama there. Where it gets expensive is the interest.
Sweden charges kostnadsränta (cost interest) on restskatt, and it runs retroactively: from 13 February on the part above 30,000 SEK, and from 5 May on the rest, in the year in which you receive the slutskattebesked. That means: if your assessment for 2025 arrives in August 2026, interest on larger amounts has been running since February 2026. Six to seven months of interest on a debt you didn't know about.
The interest rates for 2026 (as of October 2026):
Restskatt up to 30,000 SEK: 2.5% låg kostnadsränta (low cost interest), calculated from 5 May 2026
Over 30,000 SEK: 2.5% låg kostnadsränta, but only on the part above 30,000 SEK, and calculated from 13 February 2026
For very late payment (after the assessment's due date): additional late-payment interest (hög kostnadsränta) of 17.5% a year
Sounds low, but take a typical self-employed assessment of 80,000 SEK, assessment in April, payment only on the due date in July: 50,000 SEK runs from 13 February, 30,000 SEK from 5 May, both at 2.5 percent. That's around 650 SEK purely because of the timing.
Fyllnadsinbetalning: the cheapest insurance
Here's the trick most Swedes use and newcomers often overlook: you can voluntarily pay early, before the interest even starts.
The magic deadline: 12 February of the assessment year. If you make a fyllnadsinbetalning (top-up payment) by then, you avoid the interest completely.
The procedure:
Make your own tax estimate (or use Skatteverket's estimate from the previous year)
Work out the difference between the expected tax and the preliminärskatt you've paid
Transfer the amount to your tax account (Bankgiro 5050-1055, OCR number from your skattekonto)
Done. The amount is offset against the assessment later.
If you do this every year, you'll never pay restskatt interest. If you pay too much, you get the difference back with the slutskattebesked, with intäktsränta (income interest), which in 2026 is 1.125%. A weak savings rate, but better than the negative interest a restskatt causes.
What to do if the restskatt is too high
If you receive the slutskattebesked and can't pay the demand in one go, you have two options:
Apply for a payment plan (avbetalningsplan). On "Mina sidor" under "Skattekonto" → "Ansök om anstånd". Skatteverket allows instalments over up to 12 months, but at a higher interest rate (at late-payment level). Useful in an acute cash crunch, more expensive than a bank loan.
Take out a personal loan. Sounds unappealing, but for larger amounts it's often cheaper than the late-payment interest. Swedish banks and providers such as SBAB, Lendo or Avanza grant personal loans below the late-payment interest level if you have a personnummer and a permanent job.
Either way: act early. If you leave the assessment lying around, after 90 days you'll get a demand from Kronofogden, the Swedish Enforcement Authority, and with it a betalningsanmärkning (payment default record) in the UC database, which for three years blocks flats, credit cards and mobile phone contracts.
Common mistakes newcomers make
Four stumbling blocks I know from consultations:
1. No account registered for payouts. The återbäring then comes as an avi (payment slip) that you have to cash at Forex Bank or in a grocery shop. It works, but in 2026 it's an anachronistic detour.
2. Filling in K4 incorrectly. If you keep a securities account in your home country (Germany, for example), you have to declare capital gains on the K4 form. That doesn't happen automatically; no bank reports it to Skatteverket. If you forget and are caught later, you pay penalty interest plus a skattetillägg (tax surcharge) of 40% on the additional tax.
3. Not checking for double taxation. If you still had income from your home country in the tax year (rental income, pensions, fees), you need to invoke the double taxation agreement between that country and Sweden; for Germany, that's the Germany–Sweden agreement. Skatteverket credits the tax paid in Germany on application; it doesn't happen automatically. Form SKV 2710 or K12. If you come from another country, check the agreement that applies to you.
4. Ignoring the restskatt interest. If you don't pay voluntarily in February because "it's only a few hundred kronor", you don't notice that you're paying it again every year. Over five years of working life, small restskatt interest charges easily add up to 3,000–5,000 SEK, money you're literally giving away for nothing.
What you can do this week
If you've just submitted your inkomstdeklaration for 2025 and are still waiting for the assessment:
Register your account on your skattekonto. If you haven't already, it's the two-minute job that speeds up the återbäring.
Activate BankID. Without BankID you won't see the assessment digitally, only by post.
Mark February 2027 in your calendar now. With the note "Check fyllnadsinbetalning before 12 Feb". That's the most important reminder in the Swedish tax year.
If you receive a slutskattebesked in the coming weeks and aren't sure what the figures mean: Skatteverket has a free helpline on 0771-567 567 that also answers in English. For more complex cases (self-employment, K10, foreign income), a €50 consultation with a Swedish redovisningskonsult (accountant) is worth more than any forum post.
Buying a house in Sweden: practical guide, the in-depth guide to this topic (currently available in German): view it in the shop.
I'm Sebastian Schiefner, a photographer in Gothenburg, and I help people who are moving to West Sweden with finding a home and buying property. Book a free intro call.
