<…> In my country for example the applied tax rate is generally between 19% and 23% (depending on the amount you converted to FIAT), but the status of applying tax is rather incipient, and there seem to be no clear guidelines that apply to all possible scenarios.

Theoretically, having obtained BTC in each one of these scenarios may have a different tax solution:
-   Profit made on trading.
-   Profit made on mining.
-   Profit made on purchase+hold+sell.
-   Profit made on campaigns.

The tax range and required documentation to keep varies in each of these scenarios, and it may well depend of the specific tax inspector you are talking to.
This year, the tax office has emailed 14.700 people warning them that their crypto gains must be declared. Those people seem to be a subset (not all) of the ones that dealt with an exchange, and they did not necessarily convert to FIAT in order to receive the warning (theoretically, trading is also taxed, even if you don’t convert to FIAT – based on the value gained as a result).

Theoretically, if you do not convert back to FIAT you don’t have to pay taxes (yet), but the increments in position due to trading is, theoretically, subject to taxation too.<…>

<…>The thing to take into consideration is that many people are likely holders, and have not converted to FIAT yet, thus more or less postponing the tax procedure. Traders are another matter (as I stated, in theory they should declare for increased values of portfolio due to trading, even if they do not convert to FIAT – similar to dealing with shares).