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What are the tax liabilities for income earned prior to 2024 in Thailand?

Thailand tax rules tax liabilities tax exemptions income tax double tax agreements (DTA)foreign income tax number (TIN)Thai Revenue Department

Apr 16, 2026

15 days ago

ORIGINAL POSTER

There are a lot of questions regarding what and what is not liable for tax in Thailand. I stumbled across this document from the revenue department which discusses the rule appertaining to funds where income was earned prior to 2024 

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TLDR : Answer Summary

The query addresses tax liabilities in Thailand, particularly for income earned before 2024. A comment provides practical insight, stating that staying in Thailand for 180 days or more within a year necessitates obtaining a Tax Identification Number (TIN), submitting a tax return, and presenting a Thai bank statement for the previous year. The commenter notes that many exemptions can be claimed, and that Thailand has double tax agreements (DTA) with various countries.

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Graeme *******

It pretty simple 180 days here out of 365, money bought into country, get a tax number (TIN) submit a return. Get Thai bank statement for the procedding year front up. Many excemptions that can be claimed and Thailand has DTA with many countries. I myself 2 years now gone to Revenue both times very small amount to pay. Didn't even worry about DTA.

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