It depends on where you live and where you plan to live in Thailand.
If you are from a small midwestern town or city in the States and move to the Chiang Mai province you can expect to live on about 20% -23% of the cost in the States not counting your apartment.
If your country has a DTA with Thailand and your country has low tax rates and or different tax brackets compared to Thailand you likely will be paying some Thai taxes.
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