I have to add that Capital Gains Tax of Austria of 27,5% is only valid for BTC/Crypto bought earlier than March 2021.
Everything before that is tax free, and every Satoshi sold after that date is considered to be one of the possibly "old" amount.
So, if you are a citizen of Austria and have 10 BTC, while 3 were bought before 03/2021, only 2 got taxed if you sold 5 BTC after 03/2022.
Converting to other Cryptos (and stablecoins) are tax free, while it was not if converted within a year, under the old law (before 03/2022).