Furs responded last year to the soaring values of popular cryptocurrencies by issuing warnings that regular crypto mining and trading can amount to a work activity that needs to registered and is subject to taxation.

Cases are evaluated on an individual basis, with key factors being the turnover value and number of transactions in a specific period.

Asked whether any undeclared miners or traders had been discovered in recent months, Furs highlighted the example of an individual who was discovered to have engaged in regular mining over a extensive period which would have required registration as an activity.

"This discovery of undeclared work led to the individual making a self-declaration and paying almost EUR 100,000 taxes," Furs explained.

It remains unclear how many people in Slovenia are engaged in the activity of mining or trading in cryptocurrencies.

Furs has various channels for obtaining information, indulging through the international exchange of data among tax administrations.