Thailand Withholding Tax: What a Company Must Withhold and File

A Thai company can be paying its own taxes while also collecting tax from someone else's income. When a payment falls within the withholding rules, the company may pay the supplier or landlord net of tax, remit the withheld amount to the Revenue Department and document the deduction. For the recipient, that amount is generally a tax credit; it is not an extra tax added to the invoice.

Keep that mechanism separate from corporate income tax, which concerns the company's own taxable profit. VAT is another system again, with its own base, invoices and filing rules.

The difficult part is usually classification. An invoice saying “service fee” does not settle the rate, and a charge described as rent can contain other elements. The payee's legal status matters too: an individual, a Thai juristic person and an overseas company do not automatically follow the same return.

For an owner, the useful sequence is simple: identify the payee, identify what the payment actually buys, determine the rate, then match it to the correct return and evidence. A mistake at the first step can flow through every document that follows.

PND 3 and PND 53 are not two versions of the same return chosen by percentage. The split starts with the recipient. For common domestic cases, PND 3 is the usual route for relevant payments to individuals, while PND 53 is used for relevant withholding from payments to Thai companies and juristic partnerships.

Take three routine invoices. Pay an individual freelancer for work and the accountant first classifies the income, then considers PND 3. Rent an office from an individual landlord and the payee is still an individual even though the rate differs. Pay a Thai service company and PND 53 becomes the relevant domestic return when withholding applies.

The percentage does not identify the form. A service payment to an individual and one to a company may both involve a 3% reference rate, yet the returns are not interchangeable. Monthly records should therefore tie the payment to the payee's legal status, tax ID, income category and filing route.

An overseas supplier is where the shortcut fails. A foreign company should not be dropped into PND 53 simply because it is a company. Section 70 and PND 54 can apply to income paid from Thailand to a foreign company not carrying on business in Thailand, while treaty protection and permanent-establishment facts can change the result.

The practical question is therefore “Who is receiving this payment, and what kind of income is it?” Once those two facts are sound, the return is usually much easier to identify.

There is no reliable “3% on company expenses” rule in Thailand. Domestic withholding rates vary with the income category and the tax status of the recipient. A rate table is useful as a control sheet, but it becomes dangerous when it is used before anyone has established what the contract and the payment actually represent.

Rent is commonly associated with a 5% withholding rate. A straightforward office lease may fit that category cleanly, but bundled arrangements can be less obvious: rent, building services, equipment and other charges may sit on the same invoice without necessarily sharing one tax treatment. The label on the invoice is evidence of how the supplier describes the charge, not a substitute for classification.

Service and professional fees commonly carry a 3% domestic reference rate. That is why 3% appears so often in Thai accounting files, but frequency is not universality. Advertising is a useful counterexample: it has a commonly cited 2% rate, so an advertising agency invoice should not be forced into a generic “service” bucket simply because both are business expenses.

Interest paid to a corporate recipient is commonly shown at 1% in the Revenue Department's corporate withholding overview, while other recipients and specific types of interest can follow different rules. The same official overview lists 3% for royalties and 10% for dividends in the relevant corporate cases. These categories make the central point clear: the percentage follows the income, not the payer's habit.

Special regimes add another layer. In June 2026, the Cabinet approved an extension of the e-Withholding Tax incentive that would reduce qualifying 5%, 3% and 2% withholding rates to 1% for payments made through the system. That does not make 1% a universal electronic rate, and the final legal instrument still needs to be confirmed for the payment date before the reduction is treated as effective.

For a new contract, it is often more productive to write down in plain language what the supplier is being paid for before looking at a percentage. That small discipline prevents a familiar rate from becoming a default answer to an unfamiliar transaction.

A simple service invoice shows the cash flow clearly. Assume a verified payment base of THB 100,000 and a 3% rate for that specific service and recipient. The payer withholds THB 3,000 and transfers THB 97,000 to the supplier. The withheld amount is remitted through the Thai withholding system; the payer does not keep it as a discount.

Those numbers illustrate the mechanism, not a universal service rate. Rent, advertising, interest or another category can produce a different percentage and filing route. A qualifying e-Withholding Tax incentive can also change the amount after its conditions and legal status are confirmed.

VAT is deliberately left out of the arithmetic. A real invoice may include VAT, but the VAT treatment and the withholding base are separate questions; combining them casually can imply that the same base rules always apply.

The withholding certificate turns the deduction into usable evidence for the supplier. It records the payment and tax withheld, allowing the payee to support the credit in its own records where applicable. A mismatch between the certificate and the return is therefore more than a paperwork defect.

For an owner, the control is concrete: the contractual amount, net transfer, tax remitted and certificate should all tell the same story about the same payment.

Withholding happens at the relevant payment event, but the return and remittance follow the monthly filing cycle. The Revenue Department's baseline for PND 3 and PND 53 is filing by the seventh day of the month following the payment month for the regular route. Its online filing calendar commonly shows the fifteenth of the following month for internet filing.

Keeping those events separate avoids a common source of confusion. If a contractor is paid in July, the withholding belongs to that July payment, while the filing deadline falls in August. The Revenue Department's August 2026 calendar showed 7 August for the regular withholding returns and 17 August for the internet route, illustrating how the normal online date can move with the calendar.

That is why “we always file on the 15th” is not a good control. Weekends and public holidays can shift the effective date, and regular filing and online filing do not necessarily share the same deadline. The monthly Revenue Department Tax Calendar is the practical source to use for the actual month.

Internal processing dates can create another trap. An invoice may be approved late, the certificate may be prepared after payment and the bookkeeping close may happen days later, but those internal dates do not automatically move the tax obligation into another month. The payment event still needs to be captured in the correct period.

For an owner reviewing the file, three details are usually enough to make the deadline visible: the payment month, the filing channel and the current Revenue Department calendar date.

Online filing and e-Withholding Tax are not the same thing. With ordinary e-filing, the company prepares and submits the return electronically. Under e-Withholding Tax, a participating financial institution sits in the payment flow and transmits the withholding information and tax to the Revenue Department through the dedicated mechanism.

On 16 June 2026, the Revenue Department announced Cabinet approval to extend the incentive for another two years. The stated measure would reduce qualifying 5%, 3% and 2% withholding rates to 1% for payments through e-Withholding Tax from 1 January 2026 through 31 December 2027.

The legal status still needs careful treatment. Both the Revenue Department release and the Cabinet material refer to draft instruments, and the Cabinet explanation describes a transitional arrangement while the new ministerial regulation had not yet taken effect. As of 5 October 2026, the Revenue Department's published ministerial-regulation list still showed Regulation No. 389 of 2023 as the relevant rate-reduction instrument; a new final 2026 regulation was not located there.

A current payment should therefore not be put at 1% merely because the Cabinet approved the extension. Confirm the effective instrument or updated Revenue Department instruction for the payment date and check that the income category qualifies. The announced reduction is framed around rates that would otherwise be 5%, 3% or 2%, not every withholding item.

There is also an operational distinction: “we file online” does not necessarily mean the payment itself was processed through e-Withholding Tax. The incentive is linked to the dedicated payment mechanism.

A useful owner-level question is simple: which effective rule supports this rate, and through which system was this payment actually made?

The most expensive withholding mistakes often look mundane. A payee is put into PND 53 instead of PND 3 because every supplier sits in one spreadsheet. A familiar 3% code is applied to every service-looking invoice. Rent and building services are grouped under one line even though the contract treats them differently.

Other problems appear after payment. The withholding certificate is missing or does not match the return. PND 3 and PND 53 totals fail to reconcile to the supplier ledger. An overseas contractor is treated as a domestic PND 53 case without reviewing PND 54, Section 70 and the relevant treaty.

The 2026 e-Withholding Tax situation creates a different risk: relying on memory. An accountant may assume the previous 1% incentive continued automatically, or assume it ended in 2025. The Cabinet approved an extension in June 2026, but the rate still needs support from the effective rule applying to the actual payment date.

An owner does not need to become the tax preparer to catch these issues. For a large, unusual or new payment, the accountant should be able to explain four things in plain language: who the payee is, what income category is being paid, why that rate is being used, and which form and deadline apply. “We always use 3%” is not a sufficient answer.

A healthy process also lets the treatment change when the facts change. Discovering that a landlord is an individual rather than a company, or that a supplier bills from overseas, should trigger fresh classification before filing. Forcing the new fact into the old form is how shortcuts become recurring errors.

The objective is not to have the director re-perform the accounting. It is to stop an unfamiliar payee, payment type or temporary incentive from passing through the month on autopilot.