SINK Tax in Sweden explained: Rules for non-residents in 2026

If you work in Sweden without living here permanently, taxes can get confusing very quickly. This is especially true for international professionals, seasonal workers, and people who cross the border for work. One of the most important rules to know in this situation is SINK, short for Special Income Tax for Non-Residents (Särskild inkomstskatt för utomlands bosatta).

This system was created for people who earn income in Sweden but are not considered permanent residents. Even though SINK is often described as a simpler way to pay tax, the reality is a bit more complicated. To understand whether it applies to you, you need to look at several things, including how long you stay in Sweden, who your real employer is, and whether a tax treaty between Sweden and another country affects your situation.

In this guide, we take a close look at how SINK works, who can use it, and what rules matter most for non-resident workers. We also explain the economic employer rule, which has become especially important in recent years, and we cover the upcoming legal changes planned for 2026 and 2027. The goal is to give you a clear and practical overview of how short-term work in Sweden is taxed, and what options may be available if you do not live in the country full time.

The basic idea behind SINK taxation

To understand how SINK works, it helps to first look at one of the most important principles in the Swedish tax system: the difference between limited and unlimited tax liability. This distinction decides how a person’s income is taxed in Sweden and what tax responsibilities they have.

People with unlimited tax liability are usually those who live in Sweden, stay here for a continuous period of at least six months, or have strong personal and financial ties to the country. In practice, this means they are treated as tax residents. They usually pay Swedish tax on their worldwide income, often under progressive tax rates, and they may also have access to different deductions and parts of the Swedish social system.

SINK, on the other hand, is meant for people with limited tax liability. This usually includes individuals who live outside Sweden and work here only temporarily, for less than six months during a given period. Instead of using the standard Swedish income tax system, they can in some cases be taxed under SINK.

The SINK tax is a flat-rate withholding tax. This means the tax is taken directly from the gross salary by the employer, who then pays it to the Swedish Tax Agency, Skatteverket. Since SINK is considered a final tax, the employee usually does not need to submit a Swedish income tax return for the income covered by it.

This is one of the main reasons why SINK is often seen as a simple solution. It works as a kind of “pay the tax and move on” system, which reduces paperwork both for the employee and for the Swedish authorities. At the same time, this simplicity comes with a trade-off: a person taxed under SINK normally cannot claim deductions for work-related costs or personal expenses in Sweden.

How SINK rates have changed, and what will happen in 2026

For several years, the standard SINK rate was set at 25% of gross taxable income. This rate was meant to strike a balance. On one hand, non-resident workers earn money in Sweden and contribute to the Swedish economy. On the other hand, they usually do not use the full range of public services that are funded through taxes paid by long-term residents, such as long-term healthcare, subsidised childcare, or free higher education.

In recent years, however, Sweden changed parts of its domestic tax policy and reduced income tax for residents. As a result, the old SINK rate started to look less balanced in comparison. This created a discussion about fairness and tax neutrality, especially in a country that wants to stay attractive for international professionals and other foreign workers.

To respond to this, the Swedish Parliament, the Riksdag, approved a gradual reduction of the SINK rate. The idea behind this reform is not only to adjust the system to recent tax changes for residents, but also to make Sweden more competitive when it comes to attracting global talent.

Period	SINK tax rate	Legislative context
Pre-2026	25.0%	Standard rate established in 2018
From January 1, 2026	22.5%	First step of the 2026 Budget Bill reduction
From January 1, 2027	20.0%	Second step of the phased reduction

Determining residency and the 183-day rule

One of the most important parts of the SINK system is the 183-day rule. This rule is used to help decide whether a person should be treated as a tax resident or non-resident in Sweden. If someone stays in Sweden for more than 183 days during a rolling 12-month period, they will usually be seen as having unlimited tax liability.

How the days are counted

The 183-day calculation is based on physical presence in Sweden. This means that even part of a day counts as a full day. The total includes the day you arrive, the day you leave, weekends, public holidays, and even days when you are in Sweden because of short-term illness or medical visits.

To trigger unlimited tax liability, the stay normally also needs to be considered permanent, which usually means that the person sleeps in Sweden. Short trips back to your home country do not automatically break the continuity of your stay if Sweden remains your main base during that period.

Total stay days = work days + weekend days + travel days + public holidays

For cross-border commuters, for example people living in Denmark and travelling to Sweden for work, the 183-day residency rule is often not met, because they do not sleep in Sweden. As a result, they can usually still qualify for SINK, no matter how many days they work in Sweden, as long as they do not create a significant connection to the country, for example by buying a year-round home or moving their family there.

The significant connection test

The Swedish Tax Agency also looks beyond the day count itself. It checks whether a person has a significant connection, in Swedish väsentlig anknytning, to Sweden. Someone who previously lived in Sweden and still owns a home there, or has close family members living there, may still be treated as a Swedish tax resident, even if they spend fewer than 183 days in the country.

This rule is there to stop people from keeping their real life centered in Sweden while still trying to claim non-resident tax status. For short-term workers, this usually means that their home country must remain their real center of life and interests.

The economic employer rule, a major change introduced in 2021

One of the biggest changes in Swedish tax rules in recent years came into force on 1 January 2021, when Sweden introduced the economic employer approach. This reform had a major impact on how short-term work in Sweden is taxed.

Before that change, many people working in Sweden for a short period could avoid Swedish tax completely. This was often possible if they stayed in the country for less than 183 days, were paid by a foreign employer, and that employer did not have a permanent establishment in Sweden.

Since 2021, the rules no longer focus only on the legal employer, meaning the company that officially pays the salary. Instead, the key question is who acts as the economic employer. In simple terms, this means looking at which company actually benefits from the work and directs the employee in practice.

So if a person is formally employed by a foreign company but carries out work for a Swedish business, and that Swedish business controls the day-to-day tasks, that Swedish company may be seen as the worker’s economic employer. In that case, Sweden may tax the income even if the salary is paid from abroad.

Thresholds under the economic employer rule

When an economic employer is considered to exist, the usual 183-day exemption can no longer be used in the normal way. Instead, much lower limits apply.

A worker becomes taxable in Sweden if the work lasts for more than 15 consecutive working days or more than 45 working days in total during one calendar year.

This means that even relatively short work assignments in Sweden can now lead to Swedish tax liability if the work is effectively carried out for a Swedish company.

Scenario	Tax liability trigger	Reporting requirement
Short-term assignment (< 15 days)	No Swedish tax (usually)	No SINK application needed
Assignment > 15 consecutive days	Taxable from day 1	SINK application required
Total work > 45 days in a year	Taxable from day 1	SINK application required

An important detail is that work-free days, such as weekends or public holidays, do not automatically break a chain of consecutive workdays if the person stays in Sweden because of the assignment. At the same time, the 15-day and 45-day limits only include actual working days, not every day spent in the country.

This difference matters a lot in real life. For example, someone may stay in Sweden for three weeks but only work 12 business days during that time. If that person is managed by a Swedish company, they need to keep careful track of the exact days they actually worked. This is often the key to understanding whether Swedish tax applies and whether they need to apply for SINK.

The SINK application process and identity checks

SINK does not apply automatically just because someone is working in Sweden for a short period. This is a common misunderstanding. To be taxed under SINK, an application must be submitted to the Swedish Tax Agency, Skatteverket. The application can be sent either by the employee or by the employer, using form SKV 4350 or Skatteverket’s digital e-service.

Documents and coordination numbers

Before Skatteverket can process the application, the person must be properly identified. In many cases, this is done through a coordination number, called samordningsnummer in Swedish. This is a personal identification number used for people who cannot get a regular Swedish personal identity number, known as a personnummer.

To get a new coordination number, or to renew an old one, the person usually needs to visit a State Service Center in person so their identity can be checked.

A SINK application normally requires the following documents:

• a copy of a valid passport or national ID card, for EU or EEA citizens
• an employment contract showing the income that will be earned in Sweden
• a work permit, for non-EU or non-EEA citizens

Skatteverket is quite strict about passport copies. The full page must be visible, and the machine-readable code at the bottom also needs to be clear. If a coordination number has been inactive for five years, it must usually be reactivated before the final SINK decision can be issued.

How long the decision can take

It is best to submit a SINK application well before the work starts. In practice, however, a person is still allowed to begin working while the application is being processed.

There is one important thing to keep in mind. If no decision has been made by the time the first salary is paid, the employer is legally required to deduct preliminary tax instead. This is often done at a rate of 30%, which is higher than the standard SINK rate.

Once the SINK decision arrives, the employer can adjust the tax withholding. If too much tax was taken earlier, the worker can then apply to get the overpaid amount refunded.

Choosing between SINK and standard Swedish income tax

One important part of the Swedish tax system is often missed by non-resident workers: in some cases, you do not have to stay in the SINK system. Instead, you can choose to be taxed under the ordinary Swedish income tax rules, often called A-tax. This is a voluntary choice, and it can be worth considering if the standard tax system would leave you with a lower overall tax burden.

At first glance, SINK may look easier because it uses a flat tax rate and usually does not require a Swedish tax return. But simplicity is not always the cheapest option. For some workers, especially those with most of their income in Sweden, the regular tax system can be more favourable.

The 90 percent rule and access to deductions

The standard tax system is usually most useful if the person qualifies under the 90 percent rule. This rule says that if at least 90% of your total earned income during the calendar year comes from Sweden, you may be treated in a similar way to a Swedish tax resident when it comes to personal tax deductions.

That can make a big difference, because under this rule you may be able to use deductions and tax reductions that are not available under SINK.

These can include:

• Basic tax-free allowance (grundavdrag), which means that a certain part of your income is not taxed at all. The exact amount depends on your total income, but it can be significant. For higher earners, it may reach around SEK 45,600, and in some cases it can be even higher for people aged 66 or over.
• Earned income tax credit (jobbskatteavdrag), which directly reduces the amount of tax you have to pay if you are working.
• Work-related deductions, such as certain travel costs between your home and your workplace, which are normally not allowed under SINK.

Because of this, non-resident workers should not automatically assume that SINK is always the best option. In some situations, choosing ordinary income taxation can lead to a lower final tax bill, especially if Sweden is the main place where the person earns their income during the year.

System	Rate type	Key benefit	Key drawback
SINK	Flat (22.5%)	No tax return required	No deductions allowed
A-Tax	Progressive	Deductions & basic allowance	Must file a Swedish tax return

For someone with a lower annual income, for example around SEK 120,000, the ordinary Swedish tax system can sometimes lead to a much lower effective tax rate after deductions are applied. Once the basic tax-free allowance is taken into account, the real tax burden could be as low as 7.4%. In that situation, paying the 22.5% SINK rate would clearly be much less favourable.

For higher earners, the picture can look very different. A person earning around SEK 700,000 may face a much higher total tax rate under the standard system. This is because ordinary taxation can include municipal tax, often around 32%, and in some cases also national income tax of 20% on the higher part of the income. As a result, the effective tax rate may rise to more than 34%, which can make the flat SINK rate look far more attractive.

This is why there is no single answer that works for everyone. The best option depends on your total income, how much of it is earned in Sweden, and whether you can benefit from the deductions available under the regular tax system.

How to choose A-tax instead of SINK

If you want to be taxed under the ordinary Income Tax Act, this choice must be made in the same application that is used for SINK. In other words, it is not a separate process later on, so it is important to think about it carefully from the start.

Another important point is that this choice applies to all income from Swedish sources during the entire year. It is not something you can switch on and off for just one salary payment or one short assignment.

If a worker chooses A-tax, they must also remember that this comes with an extra obligation: they will need to file a Swedish income tax return the following year, usually by early May.

Social security and healthcare for short-term workers in Sweden

Tax is only one part of the financial picture for people working in Sweden for a short time. Another important element is social security contributions, known in Swedish as arbetsgivaravgifter. These are payments made by the employer on top of the salary and they help fund the Swedish social insurance system, including pensions, sick pay, and healthcare.

The role of the A1 certificate

In general, anyone working in Sweden is expected to be covered by the Swedish social security system. In that case, the employer usually has to pay social security contributions of 31.42% in addition to the employee’s salary.

There is, however, an important exception for workers from the EU, EEA, and in many cases Switzerland. If they have a valid A1 certificate from their home country, they can stay insured in that country’s social security system instead of moving into the Swedish one.

If a worker can show an A1 certificate from their home country, for example from Denmark, the situation usually looks like this:

• the Swedish employer does not pay Swedish social security contributions
• the worker continues building pension rights and social insurance history in their home country
• the employer may instead need to pay contributions according to the rules of that home country

If there is no A1 certificate, the work is normally treated as covered by the Swedish social security system. This means the work can count as pensionable in Sweden, and over time the worker may gain the right to a small Swedish pension based on those contributions.

Healthcare during a short stay in Sweden

Short-term workers also often want to know what happens if they get sick while they are in Sweden. Swedish healthcare is run by the regional authorities and is funded mainly through taxes.

For citizens of the EU, EEA, and Switzerland, the most important document is the European Health Insurance Card, or EHIC. If a worker has a valid EHIC and can show a passport or other valid ID, they are usually entitled to necessary healthcare in Sweden on the same basic terms as residents.

In practice, this means they normally pay only the regular patient fee, which is often around SEK 200 to SEK 460 per visit, instead of covering the full medical cost themselves.

For people coming from outside the EU or EEA, the situation is usually less favourable. Unless there is a separate bilateral agreement between Sweden and their home country, they generally do not have access to subsidised public healthcare on the same terms. In that case, medical treatment may need to be paid fully out of pocket or through private insurance.

Because of that, private health insurance is strongly recommended for all non-resident workers, and especially for those coming from outside the EU or EEA.

Employer responsibilities and payroll rules under SINK

For companies that hire non-resident workers, SINK is not just a tax issue for the employee. It also creates regular administrative duties for the employer. The employer is responsible for making sure the correct amount of tax is withheld, reported, and paid to the Swedish Tax Agency.

Monthly and yearly reporting

Employers must be registered with Skatteverket and submit a PAYE tax return every month. In this report, they declare the employee’s taxable salary as well as any taxable benefits provided during the employment. This can include things like a company car or free accommodation.

Even though SINK uses a flat tax rate, these benefits are still taxable and are normally taxed at the same SINK rate as the salary itself.

At the end of the year, or when the employment finishes, the employer must also provide the worker with an income statement, known as KU13. This document is important because it shows how much income was taxed in Sweden. The worker may need it later when filing taxes in their home country, especially to prove that Swedish tax has already been paid and to help avoid double taxation.

When expenses can be reimbursed without extra tax

One practical advantage of the SINK system for employers is that some assignment-related costs can be reimbursed without creating extra taxable income for the worker.

This usually includes:

• travel to Sweden at the beginning of the assignment and travel back home at the end
• temporary accommodation in Sweden during the work period

These reimbursements can be treated as tax-free, as long as they are clearly linked to the temporary nature of the work in Sweden. In that case, they do not need to be included in the worker’s gross taxable income.

Special SINK rules for specific groups

The SINK system is not exactly the same for everyone. Some groups are covered by special rules or different tax rates, depending on the type of income they receive in Sweden.

A-SINK for artists and athletes

People such as performing artists and professional athletes who live abroad but come to Sweden for work are usually taxed under a separate system called A-SINK. This applies, for example, to musicians, actors, and sports professionals taking part in performances, competitions, or events in Sweden.

The tax rate under A-SINK is 15%, which is lower than the standard SINK rate. This special rate reflects the fact that these assignments are often very short, temporary, and linked to specific public events. The rules can also apply to event organisers and certain representation businesses connected to this type of work.

Non-resident pensioners

SINK can also apply to people who earned a pension in Sweden but now live in another country. In that case, their Swedish pension may be taxed under the SINK system as well.

For non-resident pensioners, the tax rate is 25%, and this is expected to fall to 22.5% in 2026, in line with the wider SINK reform. At the same time, there is an important protection for people with lower pension income. They are allowed a tax-free monthly amount, which for 2025 is around SEK 3,773.

This means that pensioners with a small Swedish pension are not taxed from the very first krona they receive, which makes the system a bit more balanced for people with lower income.

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What this means in practice

The SINK tax system plays an important role in Sweden’s broader economic model. It was created to make temporary work in Sweden easier to manage, while still making sure that people who earn income here contribute to the system in a fair way. The planned reductions in the SINK rate in 2026 and 2027 also show that Sweden wants to stay attractive for international workers and remain competitive in a global labour market.

For workers, good preparation can make a big difference. It is usually best to apply for SINK before the job starts, complete the identity check in time if a coordination number is needed, and look carefully at whether the 90% rule could make ordinary A-tax a better financial option. A system that looks simpler at first glance is not always the most выгодный one in practice, so it is worth checking the numbers early.

For employers, the most important things are correct classification, accurate payroll handling, and regular reporting. This is especially true when the economic employer rule may apply, because even short assignments can create Swedish tax obligations if the work is really being carried out for a Swedish business.

Once you understand how SINK works, where it came from, and how the rules are changing, the whole system becomes much easier to handle. That gives both non-resident workers and Swedish employers a stronger position to manage cross-border work with more clarity, fewer surprises, and much less administrative stress.