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Thai Tax Residence: The 180-Day Rule Explained
Under Revenue Code §41, an individual is Thai tax-resident if present in Thailand for 180+ days in a calendar year. This guide explains the counting method and the link to foreign-source income taxation under Por.161/2566.
TL;DR
Under Revenue Code §41 ¶3, an individual is Thai tax-resident if present in Thailand for 180 days or more in a calendar year. Tax-residents are taxable on Thai-source income and (subject to Por.161/2566 rules from 1 January 2024 onwards) on foreign-source income brought into Thailand. Non-residents are taxed only on Thai-source income. The 180-day count includes arrival and departure days; partial days count.
How the 180-Day Count Works
- Calendar year (1 Jan
- 31 Dec).
- Each day with any presence in Thailand counts.
- Multiple stays accumulated.
- Arrival + departure days are counted.
Residence Implications
| Status | Thai-source income | Foreign-source income |
|---|---|---|
| Resident (180+) | Fully taxable | Taxable if remitted (per Por.161/2566 from 2024) |
| Non-resident (<180) | Fully taxable on Thai-source | Not taxable in Thailand |
Por.161/2566 (2024+) — Foreign-Source Income
- Tax-residents who earn foreign-source income from 1 Jan 2024 onwards.
- Income brought into Thailand (any year) is taxable in the year of remittance.
- DTA relief still applies where treaty allocates taxing rights to the source country.
- Pre-2024 foreign-source income remitted now may be grandfathered (RD guidance).
Tax Filing
- PND.90 (general personal income tax).
- PND.91 (employment-income only).
- Filing deadline: 31 March following year (paper); 8 April online.
- Allowances + deductions under Revenue Code.
Common Mistakes
- Assuming visa-exempt entry doesn't count toward 180 days — it does.
- Confusing tax residency with PR or work-permit status — separate.
- Missing Por.161/2566 for retirees relying on overseas pensions.
- Not claiming DTA where treaty allocates taxing rights to source.
FAQs
1. Can I split-year residence?
Thai tax residency is binary per calendar year; no statutory split-year rule.
Related Reading
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