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Thai Withholding Income Tax Explained: How It Works and What to Do

💡 Key takeaways

A plain-language guide to Thai withholding tax, advance payments, the roles of payers and recipients, 50 Bis certificates, and a rental-payment example.

Hello, I’m back with Tax Bagnoms. This is the 10-Minute Tax series. We are starting with a tax that leaves many people confused and curious: withholding income tax.

What is withholding income tax?

What is withholding income tax, commonly called withholding tax? Let’s start with the basic principle. Income tax for the year is calculated at year-end as the total tax due for the whole year. Once that amount is calculated, two other tax payments are deducted: half-year tax, based on the accounting period or year depending on the type of income—personal income tax for individuals or corporate income tax for companies—and withholding tax. When we file at year-end, the return shows whether our advance payments, including half-year tax and withholding tax, were greater than the tax actually due. If so, we may be entitled to a refund. That is the basic idea. Why does withholding tax exist? It sends tax to the government in advance. The payer of income is responsible for withholding it.

The principle of withholding tax

Withholding tax is an advance payment to the government. The payer must deduct tax from the recipient's income and remit it to the Revenue Department. The system is intended to provide the government with a steady tax revenue stream and reduce the tax burden on people with income at year-end.

Elements of withholding income tax

Withholding income tax has three main elements: the payer, the recipient, and the type of income.

Example of tax withholding

To understand the basic principle, consider this example: Company A pays building rent to Mr. A.

What is withholding income tax?

Withholding income tax is an advance payment to the government. The payer must deduct tax from the recipient's income and remit it to the Revenue Department. The system is intended to provide the government with a steady tax revenue stream and reduce the tax burden on people with income at year-end.

Meaning and principle

Withholding tax is a system that requires a payer to deduct tax from a recipient's income when making a payment and remit the withheld amount to the Revenue Department within the period set by law. The key idea is to collect tax in advance so the government receives a steady flow of tax revenue and taxpayers do not face one large payment at year-end.

Why do we have withholding tax?

Withholding tax has several important purposes:

Benefits of withholding tax

The main benefits of withholding tax include:

Elements of withholding income tax

Withholding income tax has the following important elements:

The payer's responsibilities

The payer's main responsibilities are:

The recipient's responsibilities

The recipient's main responsibilities are:

Important document

The important document related to withholding tax is the withholding tax certificate, also called a 50 Bis. It is evidence of withholding tax that the payer must issue to the recipient.

Calculating tax

Withholding tax calculations depend on the income type, the applicable tax rate, and the relevant laws.

Example of tax withholding

To understand how withholding works, consider this example: Company A pays building rent to Mr. A.

Case: Company A pays building rent to Mr. A.

Company A, the payer, pays building rent to Mr. A, the recipient.

Identify the type of income

Building rent is classified as type 5 income under the Revenue Code.

Applicable law

Withholding tax on building rent is governed by Section 50 bis of the Revenue Code.

Calculate the tax

Company A must withhold 5% of the rent paid to Mr. A. For example, if the monthly rent is 10,000 baht, Company A must withhold 500 baht (10,000 × 5%) and remit it to the Revenue Department.

What this means for Mr. A

Company A gives Mr. A a withholding tax certificate (50 Bis) showing the amount withheld. Mr. A must include the certificate when calculating annual income tax and may receive a refund if the amount withheld exceeds his actual tax liability.


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Kanngongkanngoen Editorial Team

We create clear educational content about personal finance, investing, and debt management, with an emphasis on accuracy and transparency.