Foreign-Sourced Income

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It is calculated on the date it arrives in Thailand (the initial date received in your account); the currency is irrelevant, it is the date the funds are remitted and received in Thailand.

No, proceeds from selling an asset in a non-Thai tax year are not taxable in Thailand, provided the sale occurred while you were not a Thai tax resident.

It is not the whole account profit that is taxed, but the gains on assets you sell and remit into Thailand. For example, if you sell shares for a gain and remit the proceeds, the gain portion is taxable in Thailand. Accurate records of cumulative gains are essential for compliance.

Yes. Thailand taxes only the foreign income that you remit or spend in Thailand. For example, if you earn $50,000 abroad but remit only $25,000, then Thai tax is calculated only on the $25,000.