I think whatever you are going to do, as long as you are earning money or intend to earn money, you need to be registered and pay the corresponding taxes that come with it. Probably every governing body wants a piece of what you are profiting or something.
There is also the factor that you need to know is that there are different taxes for different types of trades. Like holding the trading position for a long time and short term trading. Like, there's a different type of tax with that IIRC.
Better consult with a lawyer there and find out who can assist you with that.
Self-employment or not there are always taxes. If a wife can leave you the taxes never leave you
Tax is forever, love is not. Lol.