If you are living in any of these countries then you should go ahead and start a cryptocurrency business as you will pay zero tax for trading, holding and on your earnings.
1. Iran
2. Portugal
3. Malaysia
4. Singapore
5. Malta
6. Belarus
7. Germany
8. Switzerland
I am only aware of the above eight if your country falls in this list then do comment or if you are in a country, where every transaction get taxed. I am trying to compile a list.
Singapore and Switzerland are easily the best out of that list. Iran honestly, you're gonna have a lot of other things to worry about other than crypto tax and such. The rest of the list is fine too but some countries have a very strict personal income tax so be careful of judging a book by its cover.