Taxes for Bitcoin or other cryptocurrencies have become issues in some countries. This also happens in my country after there is legal protection for all digital assets, including cryptocurrencies. However, the tax for BTC is not implemented yet. This is still within the framework of the formulation and consideration.
There are always pros and cons toward the taxing for BTC if it will be implemented. If the government really want to tax the BTC, they must have the crucial reasons and must be fair for all people who have the BTC. Additionally, the regulation as the basis of the tax-decision must be clear enough, not only getting tax for the country but also considering whether the BTC holder does not mind about the amount of the tax. IN my opinion why there are still many countries that do not tax BTC is that it is quite difficult to make the mechanism, issues, and also consideration.
But, if the rule is like what OP said:
For me, the way we could still make it possible is to establish a local exchange wherein, if we convert our money to crypto, these local exchanges could already have the portion intended for the tax of each transactions.
I rather agree with this. It may be fair enough for all. But of course, consider the amount, for a fair decision.