Employment vs Liberal Profession
Thai Tax Treatment of Physicians under Sections 40 (1) and 40 (6) of the Thailand Revenue Code
Background
As Thailand’s healthcare sector continues to evolve, the engagement structure between physicians and private hospitals has become increasingly diverse. Traditional employment relationships are often replaced or supplemented by hybrid arrangements, including revenue-sharing models and per-case compensation structures.
Against this backdrop, a recurring tax issue arises – Should a physician’s income be classified as employment income under Section 40 (1), or as income from a liberal profession under Section 40 (6) of the Revenue Code?
The distinction is critical, as it directly affects the availability of deductions and the overall tax burden.
Legal Framework
The Thailand Revenue Code distinguishes between:
- Section 40 (1): income derived from employment, including salaries, wages and similar benefits; and
- Section 40 (6): income derived from liberal professions, namely arts of healing, expressly including the medical profession.
While the statutory wording appears clear, its application in practice is highly fact-specific and has been shaped by both judicial interpretation and tax rulings issued by the Revenue Department in response to tax inquiries under applicable law.
Judicial Approach : substance over form
Thai Supreme Court (Tax Division) jurisprudence has consistently adopted a substance-over-form approach in determining the nature of a physician’s income.
In Supreme Court Judgment No. 1802/2533, the Court considered a physician engaged by a private hospital under a service-based remuneration model. The physician exercised discretion in treating patients and was compensated based on services rendered.
The Court held that such income could fall within Section 40 (6), emphasizing that:
• the exercise of liberal profession judgment is central to medical practice; and
• the use of hospital facilities does not, in itself, create an employment relationship.
However, the Court made clear that where the factual circumstances demonstrate:
• Subordination to hospital management;
• Fixed working hours; and
• Characteristics typical of employment,
the income must be classified under Section 40 (1).
Revenue Department Rulings : administrative perspective
The Revenue Department has addressed similar scenarios through a number of rulings, which largely align with the Supreme Court’s approach, albeit with a stronger focus on operational control.
In these rulings, the Revenue Department has generally taken the position that:
• Physicians receiving fixed monthly remuneration;
• Working under assigned schedules; and
• Operating subject to hospital direction
derive income under Section 40 (1), regardless of how the contractual relationship is described.
Conversely, the Revenue Department has accepted classification under Section 40 (6) where:
• Remuneration is based on actual services performed (e.g., per patient or procedure);
• Income varies depending on workload; and
• The physician retains meaningful professional independence.
Particular weight is often given to whether the physician bears economic variability, which is viewed as indicative of independent professional activity.
Converging Principles
Taken together, the Supreme Court decisions and Revenue Department rulings establish a consistent principle:
The classification of a physician’s income depends on the true nature of the working relationship, not the contractual label or the professional title.
Importantly, while medicine is recognized as a liberal profession under Section 40 (6), this does not automatically determine the tax treatment in every case. The decisive factor remains the degree of independence versus control.
Practical Implications
For physicians, misclassification may result in reassessment, denial of deductions and potential penalties. Reliance on contractual wording alone is insufficient; actual working conditions must support the intended tax treatment.
For hospitals, engagement structures should be carefully reviewed. Arrangements involving:
• Fixed or guaranteed payments;
• Strict scheduling requirements; and
• Integration into organizational hierarchies
may be vulnerable to recharacterization as employment relationships.
Hybrid models, common in practice, present the greatest risk, particularly where contractual independence is not reflected in day-to-day operations.
Key Takeaways
• Substance prevails over form : Courts and the Revenue Department will look beyond contractual labels to the actual working relationship.
• Professional status is not decisive : Although medicine is a liberal profession, not all physicians earn income under Section 40 (6).
• Control is a key indicator : Fixed hours, supervision, and integration into hospital management point toward Section 40 (1).
• Payment structure matters : Fixed remuneration suggests employment, while case-based or revenue-sharing arrangements support Section 40 (6).
• Economic risk is relevant : Variable income linked to performance with indicative of independent professional activity.
• Alignment is essential: Contracts, payment terms and actual practices must be consistent to withstand scrutiny.
Author: Panisa Suwanmatajarn, Managing Partner.
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