@Gregory *******
Being a qualified FA is not completely irrelevant—you’ll understand general concepts like residency and double taxation.
But it’s also not authoritative for Thai tax matters, especially if you’re not licensed in Thailand. Thai tax rules—particularly for foreigners—are very specific and have changed recently.
Where your argument goes wrong is this:
• You’re treating it as if all foreign income is automatically taxable once someone is a Thai tax resident. That’s not how the current rules work.
• Since 2024, the key condition is remittance into Thailand. Foreign-sourced income is only taxed when it is brought into Thailand—not simply because it exists or is earned abroad.
• You’re also oversimplifying by saying tax paid abroad is just “offset.” That depends on double tax agreements and specific conditions, not a blanket rule.
So yes—residency matters. But you’re collapsing multiple rules into one and missing the remittance condition, which is central to how Thailand taxes foreign income now.
Bottom line: being a Thai tax resident does not mean all foreign income is automatically taxable.