Can I use the Schablonmetoden when calculating my taxes?

Quick Answer

You cannot use the Schablonmetoden to calculate your taxes on crypto. This is stated on Skatteverket's page: Skatteverket's Other Resources

Detailed Answer

The source above provides the following information.

""Schablonmetoden, där man använder 20 procent av försäljningspriset som omkostnadsbelopp, får inte användas när du redovisar kryptovaluta."

This roughly translates to "The standard method, which uses 20 percent of the sales price as an overhead amount, may not be used when reporting cryptocurrency.