You’ll usually need to report:

• profits from selling stocks or funds
• dividends
• crypto gains (including trades between coins)

If you made money — it’s probably taxable

If you lost money — report it anyway (it can reduce your tax)

how much tax you pay

For most investments:

30% tax on profits (capital gains)

Simple example:

• you buy shares for SEK 10,000 
• sell for SEK 15,000 
  profit = SEK 5,000 
  tax = SEK 1,500

If you use apps like Avanza or Nordnet:

• your transactions are reported automatically
• your tax return is usually pre-filled
• you mostly just need to check and confirm

This is by far the simplest setup.

Using global brokers or apps (e.g. Interactive Brokers, eToro, crypto exchanges)?

You usually need to track and verify everything yourself.

Some platforms may send data to the Swedish Tax Agency, and parts of your tax return may appear pre-filled — but this is not a guarantee of completeness.

cost basis (Omkostnadsbelopp)

Even if trades are pre-filled, you must check the acquisition cost (Omkostnadsbelopp).

If it is missing, incorrect, or set to zero, Skatteverket may assume that your profit = the full sales price. This is bad.

It means you could be taxed as if your cost was 0 SEK — which can result in significantly higher tax than expected.

Always verify or manually update this figure.

Crypto is treated like any other asset in Sweden — but the calculation rules are stricter.

You may owe tax when you:

• sell crypto for SEK or other currency
• trade one crypto for another
• use crypto to pay for goods or services

key rule: genomsnittsmetoden (average cost method)

Crypto gains must generally be calculated using genomsnittsmetoden, meaning:

• you calculate an average purchase price for each type of crypto
• every sale or trade is based on that average cost

This applies even to crypto-to-crypto swaps.

If you estimate instead of calculating properly, your declaration may be incorrect.

Many Swedish investors use an ISK (Investeringssparkonto), which changes the entire tax model.

Instead of paying 30% on each profit:

• you pay a small annual tax based on a standardized income calculation (schablonintäkt)
• this is applied to the value of your account, not your gains

2026 update: tax-free allowance

The ISK now includes a tax-free threshold:

• First 150,000 SEK per person is tax-free (2025)
• Planned increase to 300,000 SEK (2026)

This means:

• small and medium portfolios may pay little or no ISK tax
• taxation only applies above the threshold