what about the stamp tax on transactions?
No stamp duty on spread bets or CFD.
what about the stamp tax on transactions?
spread bets are a ripoff and banned in the US.No stamp duty on spread bets or CFD.

With regards to your second question. Tax regulation is complex and I have no definite answer. However, it is my impression that in most countries the distinction between capital gains tax and being taxed as a business does not depend primarily on whether you have a job or not. Usually factors such as volume of trade, frequency, education and whether you have worked in the financial industry are more important.
then why does the cfd or spread segment exist? it can't be taxes only.Regarding stamp tax on transactions, it seems to be for UK shares only so it won't be applicable to me since I trade US and French stocks.
Why are they a ripoff? Is US futures trading a rip off as well?spread bets are a ripoff and banned in the US.
Spread betting is an option if you trade infrequently.
The main downside with spread betting is the possibility of getting a much worse fill during a price spike compared to what you might of got in the real market.
eg:
https://www.euromoney.com/article/b...-poster-child-ig-in-the-line-of-fire-post-snb
What is the sort of price differential between broker prices and SB prices for trading forex?
Day to day not much differences.
But during price spikes is when they will give you worse fills and rip you off.
This was an example from the CHF spike a few years ago:
IG provided a rate of 0.9250 on the EUR/CHF pair. The rate has been much lower when compared to a number of other retail brokers who started filling client orders at rates above 1.1200.
https://www.financemagnates.com/for...nc-trades-after-financial-ombudsman-decision/