Investing in Sweden is becoming increasingly popular – both among private individuals and entrepreneurs running businesses here. The Swedish tax system is considered one of the most transparent in Europe, while at the same time offering investors significant opportunities for optimisation. In practice, this means that the right choice of tools and investment structures can significantly reduce the tax you pay – and in some cases even eliminate it.
In this article, we explain how investments are taxed in Sweden – from ISK accounts and the K4 form to cryptocurrencies and corporate capital gains – and how to legally and effectively reduce your tax burden.
ISK – the account that changed investing in Sweden
The most popular way to invest in Sweden is through the Investeringssparkonto (ISK), an investment savings account designed for simple, long-term investing. This solution is particularly attractive for people who want to invest without complicated paperwork and annual tax reporting.
With an ISK, you do not pay tax on your actual profit – neither on capital gains from selling shares nor on dividends. Instead, a small schablon tax (standardised, notional tax) is calculated on the value of the portfolio. In practice, this is often lower than the traditional 30% capital gains tax.
Why is ISK so beneficial?
Because in most cases it allows you to invest without worrying about detailed reporting, and it protects investors from paying high tax in years when they realise unusually large gains.
This is one of the main reasons why more than 5 million people in Sweden now have an ISK account.
K4 – mandatory for investors outside ISK
Not all investments can be held in an ISK. Investors who trade via ordinary brokerage accounts, use foreign platforms (such as Degiro, eToro, Interactive Brokers) or invest in cryptocurrencies must report their transactions in the K4 form.
This is where you report:
- sales of shares and funds
- transactions in derivatives
- cryptocurrencies
- gains and losses from trading on foreign exchanges
All realised gains are taxed at 30%, and any losses can reduce the taxable base (within certain limits).
The most common challenge? Collecting transaction data. For cryptocurrencies or active day trading, the number of transactions can reach hundreds or thousands. As a result, more and more investors choose to have their K4 prepared by professional accounting firms.
Cryptocurrencies in Sweden – taxation without secrets
The Swedish Tax Agency (Skatteverket) has for years been clear on how it views cryptocurrencies: they are capital assets, not currency.
This means that every sale, swap or use of crypto to pay for goods or services is a taxable event.
The key rules are:
- gains are taxed at 30%
- every transaction must be reported in the K4 form
- losses can be deducted, but not as fully as for shares
- buying crypto is not taxed – tax arises only when you sell or exchange
There is currently no possibility to hold cryptocurrencies inside an ISK.
In practice, this means greater responsibility for the investor and a strong need for accurate and detailed documentation.
Dividends in Sweden – 30% tax, but not always
The standard tax rate on dividends in Sweden, the so-called Kupongskatt, is 30%.
This applies to both individuals and foreign entities.
The good news is that for investors outside Sweden, this withholding tax can often be reduced through double taxation treaties – for example to 15% for Polish tax residents.
Dividend payments within an ISK do not require any additional reporting and are not included in the K4 form.
Selling a company and capital gains – when can you avoid tax in Sweden?
Corporate capital gains in Sweden are generally taxed at 20.6%. This includes, for example, gains from the sale of shares or business interests.
However, the Swedish system offers an important exception – and this is one of the most efficient tax optimisation tools in the entire EU.
If the sold shares qualify as “kwalificerade andelar” (qualified shares) and the company is a Swedish tax resident, it may be possible to achieve full exemption from capital gains tax.
The condition?
The proceeds must be used for business-related purposes – in practice, they need to be reinvested.
This is why many Swedish tech companies and holding structures use this mechanism when selling subsidiaries or restructuring groups of companies.
How to legally reduce tax on investments in Sweden – key strategies
There is no single universal solution, but there are several strategies that are widely used in practice:
- Choosing the right investment account (ISK vs ordinary account)
- The simplest and most common way. ISK removes tax on capital gains and dividends and replaces it with a relatively low standardised tax on the portfolio value.
- Using capital losses in the K4 form
- Properly reporting and offsetting losses can reduce your annual tax bill by several thousand or even tens of thousands of SEK.
- Holding companies – selling a business tax-free
- For entrepreneurs, a Swedish holding structure can be one of the most powerful optimisation tools, especially in connection with the sale of companies or shares.
- Reducing tax on foreign dividends
- Thanks to tax treaties, the withholding tax charged abroad can often be reduced and partly credited in Sweden.
- Strategic investment planning
- The choice of investment products and platforms also affects how and where your returns are taxed. Being aware of the differences between ISK, ordinary accounts and corporate solutions is crucial.
Poland – Sweden: how does double taxation work?
There is a double taxation treaty between Poland and Sweden that protects investors from being taxed twice on the same income.
In principle, income is taxed in the country where it arises, and then offset mechanisms ensure that you do not pay tax twice on the same amount.
This is particularly important for:
- Polish entrepreneurs operating in Sweden
- investors from Poland earning returns on the Swedish stock market
- people moving between the two countries
When should you seek help from a tax advisor?
The more complex your investments, the higher the risk of mistakes.
Professional support is especially valuable when you:
- invest through several platforms at the same time
- trade or hold cryptocurrencies
- own a company or a holding structure
- plan to sell shares in a business
- want to minimise your tax burden within the boundaries of the law
Having an expert prepare your K4 or advise on the structure of your investments can often save tens of thousands of SEK – and in corporate transactions, sometimes much more.
Need help with reporting investments, K4 or tax planning?
At Revea, we support investors, entrepreneurs and private individuals with:
- tax returns and reporting
- optimisation of investment structures
- holding and group structures
- taxation of cryptocurrencies
- cross-border tax advice between Poland and Sweden
Get in touch with us – we’ll help you choose the solutions best suited to your situation and plans.









