Do I have to pay tax in Thailand on foreign income?

You pay Thai tax on foreign income only when the money enters Thailand and the income relates to a year in which you were a Thai tax resident. Income earned in a non-resident year or before 1 January 2024 is exempt when remitted.

Thailand does not tax foreign income on an arising basis. The tax applies only when both conditions align: the income must relate to a tax-resident year and the money must enter Thailand.