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In helping Chinese companies register companies and set up their finance functions in Thailand, we have found a very common yet easily overlooked problem: most companies focus only on VAT and corporate income tax, while overlooking certain taxes that are infrequent but high-risk.

These taxes may seem uncommon, but once triggered they often mean:

• Sudden back-tax payments

• Heavy penalties

• A possible impact on the company's compliance rating and even its BOI eligibility

For companies involved in BOI applications, BOI imports and BOI clearance (reconciliation), complete tax compliance is especially critical.

In this article, we systematically review several "non-mainstream but must-know" taxes in Thailand to help you avoid these risks in advance.

1. Why Are These Taxes Easily Overlooked?

When entering Thailand, many Chinese companies tend to interpret the finance and tax system based on their experience at home, but Thai tax law differs significantly:

• Taxes are more finely divided (central and local taxes run in parallel)

• Tax bases follow a different logic (some taxes are levied on revenue rather than profit)

• Enforcement is more outcome-oriented (reasons are not taken into account; penalties are imposed directly)

This leads to a real problem: companies believe they are compliant, but under the Thai tax system they have already crossed the line.

2. Four Commonly Overlooked Taxes

2.1 Specific Business Tax (SBT)

This is the tax most easily overlooked by companies engaged in financial and real estate business.

Key features:

• Levied on revenue, not profit

• The rate is generally 2.5%–3%

• An additional 10% local tax applies

Applicable situations:

• Sale of real estate

• Financing and lending business

• Quasi-financial services

Risk: failure to file or underpayment can lead to penalties of up to 200%.

Companies involved in investment, industrial estate development or asset operations must determine whether SBT is triggered when setting up their Thai accounting system.

2.2 Excise Tax

Many manufacturers, especially those planning to apply for BOI incentives, mistakenly believe that "if we have BOI, excise tax does not apply to us". This is a typical misconception.

Excise tax applies to:

• Alcohol, beverages, automobiles and energy products

• Entertainment services, among others

Features:

• Levied at the ex-factory or import stage

• Local tax, health tax and other levies are added on top

Risk: the tax burden structure is complex, and without professional Thai finance training and support, cost estimates can easily go wrong.

Companies involved in BOI imports must assess the impact of excise tax at the same time; otherwise, product pricing and profit models will be directly affected.

2.3 Signboard Tax

This tax "looks minor, but almost every company is affected by it".

Basis of calculation:

• Signboard area and the language(s) used

• The more foreign-language text, the higher the rate

For example:

• Thai only: lower rate

• Chinese and English: a noticeably higher rate

Risks:

• Forgetting to file: penalties plus surcharges

• Non-compliant signboards: possible enforced rectification

Many companies that have just completed company registration in Thailand are most likely to overlook this when opening their premises.

2.4 Land and Building Tax

For companies with factories, warehouses or office properties, this is a long-term cost item.

Features:

• Levied annually

• Classified by use (agricultural / residential / commercial)

• The rate for commercial use can reach up to 1.2%

Risks:

• Incorrect declaration of how the property is used

• Late payment: penalties and even risks to the assets themselves

For manufacturers and companies applying for BOI-related incentives, land tax compliance directly affects the overall financial model.

3. How Can Companies Systematically Avoid These Risks?

Based on our experience serving Chinese-invested companies, we recommend building mechanisms at three levels.

3.1 Front End: Structure Design

When registering the company in Thailand and designing the business model, assess:

• Whether SBT is triggered

• Whether excise tax is involved

• Whether a BOI application is suitable

This step determines 80% of future tax risk.

3.2 Middle: Building the Finance System

Establish an accounting system that complies with Thai accounting standards:

• Identify each type of tax separately

• Maintain tax ledgers

• Distinguish the nature of different revenue streams

Regular internal Thai finance training is recommended.

3.3 Back End: Compliance and Filing Management

• Set up an annual tax calendar (especially for BOI clearance milestones)

• Review tax treatments regularly

• Prepare tax audit documentation in advance

For BOI-promoted companies, BOI clearance and tax compliance are closely linked.

4. Final Thoughts: Real Risk Starts with Not Knowing

Many companies discover only after several years of operating in Thailand that the biggest cost is not tax itself, but misconceptions about tax.

In particular, the following all directly affect a company's long-term development:

• Misjudgments at the BOI application stage

• Improper tax treatment of BOI imports

• Incomplete BOI clearance documentation

Z&X Recommendations

If you are planning to enter, or have already entered, the Thai market, we recommend completing the following as early as possible:

• A full review of all applicable taxes

• Building a sound finance system

• An assessment of how well BOI incentives fit your business