Sweden

Sweden's Skatteverket (Swedish Tax Agency) has issued comprehensive guidance on the taxation of cryptocurrency, treating crypto as a capital asset subject to the standard capital gains framework. The framework is clear and consistently applied. Sweden is notable for two features that distinguish it from many peer jurisdictions: the mandatory use of the average cost basis (genomsnittsmetoden) rather than FIFO or specific identification, and the rule limiting the deductibility of crypto losses to 70% of their value. Both features work against taxpayers relative to alternative methods and make Sweden one of the more demanding systems in the EU for active crypto investors.

Core Tax Treatment

Gains from the disposal of cryptocurrency are classified as capital income and taxed at a flat rate of 30%. There is no annual exemption, no holding period benefit, and no distinction between short-term and long-term gains. The 30% rate applies to every disposal regardless of holding period, transaction size, or frequency. Crypto-to-crypto swaps are taxable disposals — every exchange of one token for another at a gain triggers a 30% CGT event on the disposed asset.

Average Cost Basis Method

Sweden mandates the genomsnittsmetoden (average cost method) for calculating the acquisition cost of crypto assets. Under this method, the acquisition cost of each unit of a specific cryptocurrency is the weighted average cost of all units of that type held at the time of disposal, regardless of which specific units were acquired when. Every new purchase updates the average cost across the entire holding.

This method produces materially different results from FIFO or specific identification. In a rising market, the average cost method typically produces a higher reported gain on early disposals than specific identification would — because it mixes early low-cost lots with later higher-cost acquisitions. Taxpayers cannot choose an alternative method; the average cost method is statutory and non-optional.

The 70% Loss Limitation

Sweden limits the deductibility of capital losses on crypto to 70% of their face value. A loss of 100 SEK can only offset 70 SEK of gains or income. This applies specifically to crypto losses — losses on listed securities are 100% deductible. The 70% rule materially reduces the effectiveness of tax-loss harvesting strategies. Net crypto losses after the 70% limitation can offset capital gains on other assets; remaining losses can be deducted against income at a reduced rate.

This asymmetry — gains taxed at 30% on the full amount, losses only 70% deductible — is a structural disadvantage unique to crypto in the Swedish system and should be factored into any assessment of Sweden's effective tax burden on crypto activity.

Mining and Staking

Mining income and staking rewards are taxed as employment income or business income depending on the scale and organisation of the activity. Employment income in Sweden is taxed at combined municipal and state rates of approximately 32–52%, plus employer contributions where applicable. This makes the income tax component substantially more burdensome than the 30% CGT rate for investors, and means that significant staking or mining income in Sweden carries a much higher tax cost than capital gains from the same amount of appreciation.

Crypto-to-Crypto Disposals

Every crypto-to-crypto swap is a taxable disposal in Sweden, calculated using the average cost at the time of the exchange. The frequency with which Swedish tax law requires gains calculations makes comprehensive transaction tracking essential. Skatteverket has confirmed that DEX trades, DeFi swaps, and wrapped token conversions are all taxable events.

Reporting via K4

Crypto gains and losses are reported on the K4 supplement to the annual income tax return (Inkomstdeklaration 1). Skatteverket pre-populates much of the tax return with data from employers and financial institutions, but crypto transactions must be self-reported via K4. DAC8 exchange reporting is active from 2026 — Skatteverket receives transaction data from EU-licensed exchanges automatically, which significantly increases the detectability of incomplete K4 filings.