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Tax Residency — Strict 180-Day Physical Presence Counting
Individual Taxpayer v Revenue Department
Composite summary — not a single reported case. This entry distils a settled line of Thai Supreme Court (Dika / ฎีกา) authority for legal education. It is not a transcript of one reported judgment, and the heading is not a citable case number. Do not cite it as specific case law — consult a Thai-qualified lawyer for the authoritative Dika number and current application.
Facts
A foreign individual living between Thailand and other jurisdictions disputed Revenue Department's assessment of Thai tax residency for a given calendar year, on the basis that days of arrival and departure should not both be counted, or that brief transit days should not count, or that days spent abroad on Thai-employer business should be excluded.
Legal Issue
How the 180-day test in Section 41 of the Revenue Code is counted, and whether any 'centre of vital interests' or business-purpose adjustment applies.
Holding
The Supreme Court — Tax Division has confirmed that Thai tax residency under Section 41 is determined by aggregate physical presence in Thailand of 180 days or more in a tax year (calendar year). The test is mechanical: any day, or part of a day, in Thailand counts. There is no statutory 'centre of vital interests' override under Thai domestic law — though Double Tax Agreement tie-breaker rules may apply where a treaty is in force.
Reasoning
Section 41 sets a bright-line physical-presence test, contrasting with some jurisdictions' multi-factor tests. The bright line gives administrative certainty but also catches part-time residents who underestimate their day-count. DTA tie-breakers are a separate, treaty-specific layer.
Significance
Foundational rule for every long-term foreign visitor to Thailand. Combined with Por. 161/2566 and the global income remittance rules, makes day-counting a first-order tax-planning task.
Practical Takeaway
Track every day of physical presence in Thailand from 1 January. Keep boarding passes, immigration stamps, and travel records for at least 5 years. Plan for the 180-day threshold proactively — not retroactively.
Cited Statutes
- Revenue Code, Section 41
- Relevant Double Tax Agreements (tie-breaker rules)
This entry summarises a representative line of authority from the Thai Supreme Court (ฎีกา). It is intended for general legal education only and is not a substitute for advice from a Thai-qualified lawyer. Individual Dika case numbers are being verified against primary sources; until then these entries are presented as composite doctrinal summaries.
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