Is tax due on the purchase-sale of stablecoins?

"If I buy y BTC for x PLN and then sell this y BTC for, let's say, 2x PLN, do I have to pay tax (currently 19%) on that 1x profit?

Also, if I buy y USDT for x PLN and then want to sell, let's say, 2y USDT for PLN, do I also need to pay tax on that 1y profit?

How can I make sure this is legal?"

"If I buy y BTC for x PLN and then sell this y BTC for, let's say, 2x PLN, do I have to pay tax (currently 19%) on that 1x profit?

Also, if I buy y USDT for x PLN and then want to sell, let's say, 2y USDT for PLN, do I also need to pay tax on that 1y profit?

How can I make sure this is legal?"

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