A Skatteverket investigation into Sweden’s crypto sector has resulted in hefty tax bills for six companies in Boden, with the firms collectively ordered to pay almost 540 million Swedish kronor (about $56 million). The tax authority says the companies used corporate structures to gain benefits they were not eligible for.

The findings emerged from a broader review of crypto businesses, during which Skatteverket identified arrangements that allegedly masked cryptocurrency mining activities. Swedish broadcaster SVT reported on Sept. 3 that the six Boden-based companies accounted for most of the tax adjustments issued as part of the latest phase of the probe.

Patrik Lillqvist, Skatteverket’s…