Hey mate,
There are no apparent rules until the moment on cryptos in Bulgaria. And I am not a financial or tax adviser. So please, do not take it as a recommendation:
We should pay taxes on the profits we withdraw. For example, if you have bought Bitcoin at $20k and you sell it now, you have a profit, and we should pay taxes. However, if you bought at $60k and now you sell it at $43, you did not make profits, so even you withdraw it, you shouldn’t pay taxes.
At least, this is how I understand what I have read about it.
Cheers,