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Capital Gains on Share Sales — Onshore, Offshore, and the Revenue Code Section 40(4)(g) Treatment
Selling Shareholder (Plaintiff) v Revenue Department (Defendant)
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 Do not cite it as specific case law — consult a Thai-qualified lawyer for the authoritative Dika number and current application.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 shareholder — individual or corporate, Thai or foreign — sold shares in a Thai limited company or in a holding vehicle indirectly owning Thai assets. Disputes commonly arose over: (i) whether the gain was Thai-sourced and taxable under Section 41 (for individuals) or Section 66/70/76 (for non-resident corporates); (ii) whether the Stock Exchange of Thailand exemption applied; (iii) whether DTA capital-gains articles preserved or removed Thai taxing rights, particularly the 'real-property-rich' company carve-outs in many modern DTAs; and (iv) the treatment of an offshore share sale where the underlying value derived from Thai land or business.
Legal Issue
When capital gains from the sale of shares in Thai companies (or shares in offshore holding vehicles holding Thai assets) are subject to Thai income tax, and what DTA protections apply.
Holding
The Supreme Court — Tax Division has held: (i) for individuals, gains from the sale of unlisted shares in a Thai company are income from sources in Thailand and taxable under Section 40(4)(g) of the Revenue Code, ordinarily on the seller's annual personal income tax computation; gains from sales of listed shares on the Stock Exchange of Thailand by individuals are generally exempt under Section 42; (ii) for non-resident corporate sellers, gains from the sale of unlisted shares in a Thai company are Thai-source income; the buyer (or the foreign seller via the company) must withhold 15% under Section 70 unless a DTA provides relief; (iii) DTAs typically retain Thai taxing rights where the company's value is principally derived from Thai immovable property — the increasingly common 'land-rich' carve-out; (iv) offshore share sales that are in substance disposals of Thai assets may be assessed where the structure is a sham or where a specific anti-avoidance rule applies; (v) listed-share sales by non-residents on the Stock Exchange of Thailand benefit from the same exemption as individuals in narrow conditions.
Reasoning
Section 40(4)(g) is the long-standing source rule for share-sale gains. The DTA capital-gains article allocates taxing rights between residence and source; the land-rich carve-out reflects the international consensus that real-estate-backed value should remain taxable at source. The substance-over-form approach to offshore structures is consistent with general anti-abuse principles and the trend of BEPS-era reforms.
Significance
Foundational for M&A, private-equity exits, family-wealth transitions, and any cross-border restructuring of Thai assets. Together with Por. 161/2566 (foreign-sourced income remittance) and Section 70 withholding, it shapes the tax cost of any share-based exit from a Thai investment.
Practical Takeaway
Map the tax position before signing any share-sale SPA. For individual sellers, model the personal income tax effect on unlisted share gains. For non-resident corporate sellers, identify whether a DTA applies and whether the company is 'land-rich' under the relevant article. For offshore-structured sales of Thai assets, take advice on substance-over-form risk well before closing.
Cited Statutes
- Revenue Code, Sections 40(4)(g), 41, 42, 66, 70, 76
- Royal Decrees implementing each DTA (capital-gains article, including any 'real-property-rich' carve-out)
- Stock Exchange of Thailand exemption provisions
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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