Introduction
For entrepreneurs operating in Thailand, choosing between conducting business as an individual and incorporating a limited company is not merely a question of administrative convenience. The choice determines how business income is taxed, which expenses can be deducted, how profits can be withdrawn, and what ongoing compliance obligations apply.
Thailand’s standard corporate income tax rate is 20% of net profit, while personal income tax is imposed at progressive rates of up to 35%. At first glance, a company may therefore appear to offer a lower tax burden. That comparison, however, is incomplete. Corporate profits may be taxed again when distributed to individual shareholders as dividends, while individuals may benefit from income-specific expense deductions and personal allowances.
The more relevant question is not which tax rate is lower, but which structure produces the more efficient overall tax outcome for the particular business, taking account of its profit margin, deductible expenses, owner remuneration, distribution policy, and administrative costs.
1. How Business Income Is Taxed
1.1 Operating as an Individual
An individual carrying on business in Thailand is generally subject to personal income tax on assessable income under the Revenue Code. The applicable treatment depends on the nature of the income and its classification under Section 40.
Personal income tax is calculated on taxable income after the deductions and allowances permitted by law. Depending on the income category, the taxpayer may be entitled to a prescribed expense deduction or may deduct actual qualifying expenses, subject to the applicable rules.
The personal income tax rates are progressive:
| Annual taxable income (THB) | Marginal tax rate |
|---|---|
| 0–150,000 | Exempt |
| 150,001–300,000 | 5% |
| 300,001–500,000 | 10% |
| 500,001–750,000 | 15% |
| 750,001–1,000,000 | 20% |
| 1,000,001–2,000,000 | 25% |
| 2,000,001–5,000,000 | 30% |
| Over 5,000,000 | 35% |
These are marginal rates, meaning the highest rate applies only to the relevant portion of taxable income falling within that bracket, not to the taxpayer’s entire income.
The effective tax burden therefore depends on the amount of taxable income and the deductions and allowances available. An individual with relatively modest taxable income may face a substantially lower effective rate than the top marginal rate suggests.
1.2 Operating Through a Thai Limited Company
A Thai limited company is a separate taxable entity. Its corporate income tax is generally calculated on net profit for the accounting period, subject to the Revenue Code’s rules on taxable income and deductible expenses.
The standard corporate income tax rate is 20%. Qualifying small and medium-sized companies may benefit from lower rates under the applicable conditions.
For qualifying Thai companies with paid-up capital not exceeding THB 5 million and annual revenue from sales of goods and services not exceeding THB 30 million, the SME corporate income tax schedule generally provides:
| Annual net profit (THB) | Corporate income tax rate |
|---|---|
| Not exceeding 300,000 | Exempt |
| Over 300,000 up to 3,000,000 | 15% |
| Over 3,000,000 | 20% |
Eligibility must be checked against the statutory requirements and the company’s circumstances. A company does not qualify merely because it is small in practice or has a limited number of employees.
Incorporation also introduces obligations such as maintaining accounting records, preparing financial statements, obtaining an audit where required, and filing corporate tax returns. These costs should be included when comparing the two structures.
2. Why Comparing 20% Corporate Tax With 35% Personal Tax Can Be Misleading
The headline rates do not measure the total tax burden on the owner’s business profits.
For an individual, personal income tax is generally imposed on the individual’s taxable income from the business. For a company, corporate income tax is imposed on the company’s taxable profit. If the after-tax profit is then distributed to an individual shareholder, dividend taxation may also arise.
Consider a company that earns THB 1,000,000 in taxable profit and pays corporate income tax at 20%.
- Corporate income tax: THB 200,000.
- Profit remaining after corporate tax: THB 800,000.
- If the entire remaining profit is distributed as a dividend to an individual shareholder, a further dividend tax consideration arises.
For a Thai-resident individual receiving a dividend from a Thai company, dividend withholding tax is generally 10%. An individual may, subject to the applicable rules, choose to treat the dividend as final-taxed or include it in assessable income and claim the relevant dividend tax credit where available.
If the dividend is subject to 10% withholding as a final tax, the additional tax on THB 800,000 would be THB 80,000. The combined corporate and dividend tax would therefore be THB 280,000, or 28% of the original THB 1,000,000 profit.
This is an illustrative calculation, not a universal effective tax rate. The outcome can differ depending on the shareholder’s tax position, the availability and use of dividend tax credits, the distribution decision, and any applicable exemptions or special rules.
The comparison demonstrates why the corporate tax rate alone cannot establish that incorporation is more tax-efficient.
3. When Operating as an Individual May Be More Tax-Efficient
An individual business structure may be appropriate where the business is relatively small, the owner’s taxable income is modest, or the relevant income category permits deductions that produce a favourable tax outcome.
3.1 Lower Taxable Income
Because personal income tax is progressive, the effective rate can remain relatively low when taxable income is concentrated in the lower brackets.
A business generating modest profits may therefore incur less tax as an individual than a company subject to corporate income tax, particularly where the individual can use personal allowances and applicable expense deductions.
The result should be calculated from taxable income rather than gross revenue. A comparison based only on turnover can produce a misleading conclusion.
3.2 Income-Specific Expense Deductions
Certain categories of personal income permit standard expense deductions, while others allow qualifying actual expenses or prescribed deductions.
This can materially affect the outcome for consultants, professionals, contractors, and other service providers. The correct treatment depends on the legal classification of the income, not simply the description used on an invoice.
An individual should therefore confirm the applicable Section 40 category and expense deduction rules before comparing personal income tax with corporate income tax.
3.3 Simpler Business Operations
A sole proprietor generally avoids some of the accounting, financial statement, audit, and corporate filing requirements associated with operating a limited company.
Where the business has limited commercial risk, no immediate need for outside investment, and no regulatory requirement to operate through a company, the lower administrative burden may be an important consideration.
However, simplicity should not be confused with universal tax efficiency. The decision must still reflect the individual’s income level, allowable deductions, and legal obligations.
4. When Incorporating a Company May Be More Tax-Efficient
A company may become more attractive when profits increase, business expenses are substantial, or the owner intends to retain earnings for future operations rather than withdraw all profits immediately.
4.1 Higher Business Profits
At higher levels of taxable income, an individual may face marginal personal income tax rates of 30% or 35%, while the standard corporate income tax rate remains 20%.
This difference can create an opportunity for tax efficiency. However, the comparison is meaningful only after accounting for the owner’s remuneration, dividend taxation, and any other personal income.
If the owner withdraws all profits as taxable remuneration or dividends, the combined tax outcome may differ materially from the corporate rate alone.
4.2 Retaining Profits in the Company
One of the principal tax considerations is whether the owner needs to withdraw the entire profit for personal use.
A company can generally retain its after-tax profits for legitimate business purposes, including working capital, equipment, expansion, recruitment, and other investments. Where the owner does not immediately distribute the profits, shareholder-level dividend tax is generally deferred until a taxable distribution occurs.
This can improve cash flow and support reinvestment. It does not mean that retained profits are tax-free: corporate income tax remains payable on taxable profits, and subsequent payments to shareholders must be characterised and treated correctly.
4.3 Deductible Business Expenses
A company may deduct ordinary and necessary business expenses that satisfy the Revenue Code’s requirements. Depending on the circumstances, these may include employee salaries, rent, professional fees, equipment depreciation, and other qualifying costs.
The company must be able to demonstrate that expenses were actually incurred for the business and satisfy the applicable documentation and deduction rules. Personal expenditure does not become deductible merely because the owner pays it through a company bank account.
Similarly, remuneration paid to a shareholder or director must be genuine, properly documented, and commercially supportable. An excessive payment may not receive the intended tax treatment.
4.4 Business Growth and Commercial Structure
A limited company may be preferable where the business intends to hire employees, enter into larger commercial contracts, bring in investors, or separate business assets and liabilities from the owner’s personal affairs.
These commercial considerations are not tax deductions in themselves, but they may justify the additional compliance costs of incorporation. A tax-efficient structure should support the business’s actual operating model rather than be selected exclusively on the basis of a nominal tax rate.
5. Salary, Dividends, and the Tax Cost of Withdrawing Profits
For a company owned and managed by an individual, the method of extracting money from the company can materially affect the overall tax outcome.
5.1 Salary or Director’s Remuneration
A salary or remuneration payment is generally assessable personal income of the recipient. For the company, a genuine and properly supported remuneration expense may be deductible when calculating taxable profit, subject to the Revenue Code and other applicable rules.
The tax analysis should consider both sides of the transaction: the reduction in corporate taxable profit and the personal income tax payable by the recipient.
A salary should reflect actual services and be properly authorised and documented. Payments should not be artificially set or recorded without regard to the underlying work and commercial circumstances.
5.2 Dividends
Dividends are distributions of company profits to shareholders. They are not ordinary operating expenses deductible in calculating corporate taxable profit.
Where the company has already paid corporate income tax, distributing profits as dividends can produce an additional shareholder-level tax cost. For an individual receiving dividends from a Thai company, the general 10% withholding tax treatment and the available personal tax election should be considered.
The appropriate calculation depends on the shareholder’s circumstances and whether the dividend is treated as final-taxed or included in assessable income with any applicable tax credit.
5.3 Retained Earnings
If profits remain in the company, the shareholder does not ordinarily incur dividend tax merely because the company has accumulated after-tax profits.
Retaining profits may therefore be appropriate when the business requires capital for future growth. However, funds should remain within the company for legitimate corporate purposes, and any subsequent withdrawal must have a valid legal and accounting basis.
Company money should not be treated as the owner’s personal money. Informal withdrawals, undocumented payments, or the payment of personal expenses from company funds can create tax, accounting, and corporate governance issues.
6. Tax Comparison: An Illustrative Example
Assume an individual business and a limited company each generate THB 2,000,000 in taxable profit before owner-level remuneration or distributions. For illustration, assume the company is subject to the standard 20% corporate income tax rate and the individual’s taxable income from the business is THB 2,000,000, with no other income or additional allowances beyond the basic assumptions used in the calculation.
| Item | Individual | Company |
|---|---|---|
| Taxable profit/income | THB 2,000,000 | THB 2,000,000 |
| Income tax before owner distributions | THB 365,000 | THB 400,000 |
| Profit remaining after company tax | Not applicable | THB 1,600,000 |
Under these assumptions, the individual’s personal income tax would be approximately THB 365,000, based on the progressive tax bands and before taking account of any additional applicable deductions or allowances. The company’s corporate income tax would be THB 400,000.
On this simplified comparison, the individual would pay less income tax at the operating stage. But this does not establish that operating as an individual is always preferable. The calculation excludes differences in allowable expenses, the cost of compliance, the company’s eligibility for SME rates, and the tax consequences of any later dividend distribution.
If the company distributes the full THB 1,600,000 after-tax profit and the distribution is subject to 10% final dividend withholding tax, the additional dividend tax would be THB 160,000. The combined company and dividend tax would then be THB 560,000.
Conversely, if the company retains its profits for business use, the shareholder-level dividend tax would generally not arise at that time. The two structures should therefore be compared using the same economic assumptions, including how much money the owner actually needs to withdraw.
The figures above are illustrative and should not be used as a final tax computation for a specific taxpayer.
7. Other Factors That Affect the Decision
7.1 VAT Registration
The choice between operating as an individual and incorporating a company does not, by itself, determine whether VAT registration is required. In general, a person carrying on a business that supplies goods or services subject to VAT and whose annual turnover exceeds THB 1.8 million must consider VAT registration, subject to the applicable rules and exemptions.
An individual business may therefore have VAT obligations even if it is not incorporated. VAT should be assessed separately from income tax when comparing structures.
7.2 Accounting and Compliance Costs
A company generally incurs accounting, financial statement, audit, corporate filing, and tax compliance costs that may not apply in the same form to an individual business.
These costs reduce the commercial benefit of incorporation, particularly for businesses with low turnover or narrow profit margins. They should be included in the comparison rather than treated as incidental expenses.
7.3 Liability and Commercial Risk
A limited company is a separate legal entity, which can help separate business obligations from the owner’s personal affairs. This separation is subject to applicable law and does not eliminate personal liability arising from guarantees, personal misconduct, statutory duties, or other circumstances.
Where the business carries significant contractual, employment, financing, or operational risks, the legal structure may be important even if the immediate tax savings are modest.
7.4 Eligibility for Tax Incentives
Certain companies may qualify for SME tax rates or other tax incentives, depending on their activities and circumstances. Other businesses may qualify for specific investment promotion privileges or sector-based incentives.
These benefits should be verified against the relevant criteria. Incorporation alone does not establish eligibility for any particular incentive.
Conclusion
Neither operating as an individual nor incorporating a limited company is inherently more tax-efficient in every case.
An individual structure may be attractive where taxable income is modest, applicable expense deductions are favourable, and the business does not require a corporate structure. A company may be more suitable where profits are higher, legitimate business expenses are substantial, earnings will be retained for reinvestment, or commercial considerations justify incorporation.
The correct comparison must account for the tax payable at the business level, the treatment of remuneration and dividends, the timing of profit distributions, allowable deductions, applicable tax incentives, and the cost of ongoing compliance.
For business owners, the objective should be to select a structure that is both commercially appropriate and tax-efficient under the actual facts. A calculation based solely on the 20% corporate tax rate and the 35% personal income tax rate is not sufficient to support that decision.
This article provides general information on Thai tax law and is not a substitute for tax advice based on a taxpayer’s actual income, business activities, deductions, and corporate structure. Applicable rates, deductions, and eligibility criteria should be verified for the relevant tax year before implementation.
