How to settle CFD Trading tax, how high is the tax in Poland / Switzerland / Thailand?

As in the topic, CFD - Contract for Differences, what are the tax burdens and opportunities for CFD Trading in these three countries. If you know the answer for only one country, I'm interested too. :-)
As in the topic, CFD - Contract for Differences, what are the tax burdens and opportunities for CFD Trading in these three countries. If you know the answer for only one country, I'm interested too. :-)
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