@Dominik *************
it definitely changes. But you have to consider both countries in terms of of income. Your tax may have to be be paid in home/employment country. Depends on the country in question.
If you spend more than 180 days in Thailand, you are legally supposed to file any income in Thailand as well. IF its actually remitted or spent here. But dual tax agreements may allow you to deduct paid tax at home as tax credits (effectively no tax in Thailand, but still technically duty to report)
Wealth and investments however, you would only tax in Thailand if thats where you spend most of your time. Ans only on gains/remittances into Thailand
Tax is a complicated subject and depends on allot of factors.
If you are completely independent/not employed. And your clients are NOT Thai. You may be able to set up a structure where you pay tax only in Thailand IF you spend more than 180 days here.
It all depends on so many factors