Withholding Tax on Invoices in Thailand: What Freelancers and SMEs Need to Know

What Is Withholding Tax (หัก ณ ที่จ่าย) in Thailand?

If you invoice clients based in Thailand for services, you've probably noticed a payment that lands a few percent short of what you billed. That's usually withholding tax (ภาษีหัก ณ ที่จ่าย) at work: many Thai businesses are required to withhold a percentage of a service payment at source and remit it to the Revenue Department on the supplier's behalf, before the rest reaches you.

For most professional and service invoices, the standard rate is 3% of the pre-VAT (net) amount for Thailand-based freelancers and businesses billing a Thai company. If you're a non-resident contractor invoicing a Thai client from overseas, withholding follows different rules and rates that depend on tax treaties — check your specific situation rather than assuming the same 3%.

Why It Confuses Freelancers and SMEs

Withholding tax is straightforward once you know it's coming, but it trips people up for a few reasons:

• The amount withheld isn't shown on your original invoice — the client calculates and deducts it when they pay
• A payment that's 3% short of the invoice total can look like an underpayment or a mistake if you're not expecting it
• Reconciling "invoiced amount" against "amount received" by hand, invoice by invoice, is easy to get wrong

What Withholding Tax Means in Practice

Who Withholds, and How Much

The client withholds the tax, not you — it's deducted from what they pay you, and it's their responsibility to remit it to the Revenue Department. The standard rate for most services is 3% of the net amount, before VAT.

The WHT Certificate: Not Something an Invoicing Tool Issues

When a Thai client withholds tax, they're required to issue you an official withholding tax certificate (หนังสือรับรองการหักภาษี ณ ที่จ่าย), and to file the relevant return (such as ภ.ง.ด.3 for individuals or ภ.ง.ด.53 for companies) with the Revenue Department. That certificate and filing are the client's — or your own, if you're the one withholding as a Thai business paying a supplier — responsibility, together with your accountant. No invoicing software generates the official certificate or files it on your behalf; it's a step that sits with whoever is required to withhold, not with the tool used to create the original invoice.

How Lemon Invoice Handles Withholding Tax

Lemon Invoice doesn't try to replace your accountant or the official paperwork. What it does is remove the manual reconciliation work around it:

• Auto-flags Thailand-based customers. Set a customer's country to Thailand, and Lemon Invoice automatically flags them for withholding tax — no need to remember which of your clients this applies to.
• Auto-calculates the standard 3%. The 3% is calculated on the net, pre-VAT amount, exactly as the standard rate applies to most service invoices.
• Shows it on the receipt. When you record payment, the withheld amount is shown clearly on the receipt, so the total your bank shows and the total on your receipt agree — with the withholding tax accounted for, not a mystery gap.

What Lemon Invoice does not do: it doesn't generate the official withholding tax certificate, it doesn't file ภ.ง.ด.3 or ภ.ง.ด.53 with the Revenue Department, and it doesn't let you set a custom or per-line withholding rate — it applies the standard 3% consistently, on the net amount. The certificate and filing stay exactly where they are today: with your client (or your own accounting process) and your accountant.

A Simple Example

Say you invoice a Thai client 10,000 THB (net) for consulting services, plus 7% VAT — a total of 10,700 THB. The client withholds 3% of the net amount (300 THB) and pays you 10,400 THB, along with a withholding tax certificate for the 300 THB. In Lemon Invoice, that customer is already flagged for withholding tax, the 300 THB is calculated automatically, and it's shown on the receipt when you mark the invoice as paid — so the 10,400 THB you actually received matches your records exactly, instead of leaving you to figure out where the missing 300 THB went.

Who This Matters Most For

Withholding tax on invoices comes up constantly for freelancers, consultants, and IT or professional-services businesses billing Thai clients. If that's your situation, see how Lemon Invoice handles invoicing for IT and service businesses, including automatic withholding tax tracking on every receipt.

Keep the Certificate and Filing with Your Accountant

Treat Lemon Invoice as the tool that keeps your invoices, receipts, and withholding tax records clean and reconciled — and your accountant (or your client's) as the one who issues the certificate and files it with the Revenue Department. Getting the invoicing side organized makes that conversation with your accountant faster, not the other way around.