When a foreigner who is a tax resident of Thailand pays tax on his income abroad, the amount of paid tax can be credited against the tax payable in Thailand. This is applicable only if the country has a Double Tax Agreement (DTA) with Thailand. In this case, there will be no double taxation for tax residents of Thailand.
The amount of tax that can be credited should not be higher than the amount of Thailand’s tax liable to the foreign-sourced income.
To use this foreign tax relief, the Revenue Department may require documents and evidence to prove sources of income and to claim foreign tax credit under DTA. Such documents must be in English or Thai. For the supporting documents to claim foreign tax credit, Tax Payment Certificate issued by the foreign tax authority is recommended.
Contact MSNA for personal income tax computation, filing of tax returns and getting Income Tax Payment Certificate or Tax Residence Certificate in Thailand.