Crypto Capital Gains Tax in Sweden — Worked Examples

Capital gains tax on crypto is 30 percent in Sweden — most people know that. But how much you actually pay is decided by the details: the average cost method, the 70% loss rule and how many taxable events you create along the way. In this guide we work through real examples, krona by krona, so you can see exactly where the tax arises — and where the expensive mistakes hide.

The basics: 30% on gains

Crypto is taxed as capital income in Sweden: 30% tax on the net gain at disposal. A disposal is a sale for fiat, a swap into another crypto (including stablecoins) or a payment with crypto. The tax is always calculated in Swedish kronor and reported on form K4, section D — we covered the full process in Declaring crypto taxes in Sweden.

Example 1: buy, rise, sell

The simplest case. You buy 0.05 BTC for 40,000 kr. A year later you sell it all for 55,000 kr.

• Gain: 55,000 − 40,000 = 15,000 kr
• Tax: 15,000 × 30% = 4,500 kr
• Left in your pocket: 50,500 kr

Note that the holding period is irrelevant — Sweden has no discount for long-term ownership. It is 30% whether you held for ten days or ten years.

Example 2: multiple buys — the average cost method

You buy 1 ETH for 30,000 kr in January and 1 ETH for 50,000 kr in August. In December you sell 1 ETH for 45,000 kr. Which ETH did you sell — the cheap one or the expensive one?

The answer: neither. Skatteverket requires the average cost method:

• Cost basis: (30,000 + 50,000) / 2 = 40,000 kr per ETH
• Gain: 45,000 − 40,000 = 5,000 kr
• Tax: 5,000 × 30% = 1,500 kr

The average is calculated per cryptocurrency across all your accounts and wallets combined. Every new purchase shifts the average; every sale reduces the holding but leaves the per-unit average unchanged.

Example 3: gain + loss — the 70% rule

You make a 20,000 kr gain on BTC and a 20,000 kr loss on an altcoin in the same year. Intuition says zero tax. Skatteverket says otherwise:

• Deductible loss: 20,000 × 70% = 14,000 kr
• Taxable gain: 20,000 − 14,000 = 6,000 kr
• Tax: 6,000 × 30% = 1,800 kr — even though the portfolio went ±0

The hidden tax: swaps and stablecoins

This is where most unexpected tax bills are created. Every crypto-to-crypto swap is a disposal at the market value in kronor at that moment. An active trader rotating between coins creates hundreds of taxable events per year — and “parking in USDC” between trades is a disposal every single time.

The consequence: you can be sitting on an unrealised loss and still owe tax on large realised gains, if your swaps during the year locked in profits. Track it continuously, not just at declaration time — and export transaction history from every exchange you use (especially ones you are leaving, like Binance after the EU lockout).

Can you legally reduce the tax?

• Fewer taxable events. The simplest “optimisation”: swap less, hold longer. Every unnecessary round trip costs you via the 30/70 asymmetry.
• Realise losses deliberately. If you have large realised gains, realising losses in the same year can be rational — 70% of them offset the gains.
• Report everything correctly. Missed loss deductions are money thrown away, and missed gains get expensive with penalty surcharges once discovered — which, with DAC8 reporting, is now a countdown.

Frequently asked questions