Thailand VAT + Withholding Tax Guide (2026)

Invoicing in Thailand involves two taxes working together on the same transaction — Value Added Tax (VAT) and Withholding Tax (WHT) — and that interaction trips up more freelancers and SMEs than either tax on its own. Here's how they fit together, what actually needs to appear on your invoice, and what to watch for when billing foreign clients.

Do You Need to Register for VAT?

The mandatory VAT registration threshold is THB 1,800,000 in gross annual turnover. Once you cross it, you must register within 30 calendar days using Form VAT 01. Turnover is calculated on total revenue — no deduction for expenses or cost of sales.

Registering late carries real consequences: a criminal fine of up to THB 5,000, plus a civil surcharge of up to 200% of the unpaid VAT, with 1.5% monthly interest on top. If you're near the threshold, it's worth registering before you cross it rather than after.

The Current VAT Rate — and a Note on Timing

The statutory standard VAT rate under Thai law is 10%, but the Thai government has held an effective rate of 7% in place through regularly renewed Royal Decrees since 1992. The current decree keeps 7% in effect through 30 September 2027 — worth checking for a further extension as that date approaches, since the underlying statutory rate would otherwise apply.

Service exports consumed entirely outside Thailand qualify for 0% VAT (zero-rated), provided you can show contracts, deliverables, and proof the payment came from offshore. Services performed in Thailand but consumed within Thailand by a foreign client are taxed at the standard rate.

Withholding Tax: When It Applies

WHT only applies when the payer is a juristic entity — a registered company, partnership, or branch. If your client is a private individual, WHT doesn't apply. There's also a minimum threshold of THB 1,000 per invoice, though recurring contracts (like a monthly retainer) that cumulatively exceed this are still subject to WHT.

WHT is deducted from the net, pre-VAT amount — never calculated on the VAT-inclusive total. This is one of the most common invoicing errors in Thailand.

Common WHT rates relevant to freelancers and SMEs:

Professional fees (legal, accounting, engineering) — 3%
General services (IT, consulting, marketing, design) — 3%
Commercial rental (office, land, equipment) — 5%
Advertising — 2%
Telecom and recurring digital/utility services — 3%
Royalties and licensing — 3%

How VAT and WHT Interact on One Invoice

A THB 100,000 consulting fee, invoiced to a Thai company, plays out like this:

You invoice THB 107,000 (THB 100,000 fee + 7% VAT)
The client withholds 3% WHT on the net THB 100,000 — THB 3,000
You receive THB 104,000 in cash
The client issues you a Form 50 Tawi withholding tax certificate for THB 3,000
You remit THB 7,000 in output VAT to the Revenue Department in your monthly filing; the THB 3,000 WHT becomes a credit against your annual income tax

The Form 50 Tawi certificate matters more than it might seem — without it, you can't claim the WHT as a tax credit, and the deducted amount becomes an unrecoverable loss. Track every certificate before filing.

What Must Be on a Full Tax Invoice

To let your client claim input VAT, your invoice needs:

The words "Tax Invoice" clearly shown
Your legal name, address, and 13-digit Tax ID
The client's legal name, address, and 13-digit Tax ID
A sequential invoice number
Itemised description, quantity, and unit value
VAT shown as a separate line, calculated on the pre-tax amount
The issue date
"Head Office" or branch number for both parties

Invoices must be in Thai language and Thai Baht by default. Foreign currency or language requires prior approval from the Revenue Department — if approved, both currencies must appear side by side with the exchange rate stated.

Invoicing Foreign Clients

If you're a Thai-based freelancer or SME billing a foreign company with no permanent establishment in Thailand, that client falls outside Thai tax jurisdiction — they won't (and can't) withhold Thai WHT. You receive the full invoiced amount. If the service is consumed entirely offshore, it also qualifies for 0% VAT, provided you keep records proving it.

Payments running the other way — a Thai company paying a foreign supplier — face a 15% final withholding tax, though this can often be reduced under a Double Tax Agreement if the supplier provides a valid tax residency certificate.

Filing Deadlines

VAT — Form PP.30, monthly, by the 15th (paper) or 23rd (e-filing)
WHT — Form PND 3 (individuals) or PND 53 (companies), monthly, by the 7th (paper) or 15th (e-filing)

A Note on e-Withholding Tax

Businesses using Thailand's e-Withholding Tax system, processed through participating banks, benefit from a reduced uniform 1% WHT rate in place of the standard 5%/3%/2% rates — a real cash-flow advantage if you're set up for it.

Common Mistakes to Avoid

Calculating WHT on the VAT-inclusive total instead of the net pre-tax amount
Not chasing the Form 50 Tawi certificate after a client withholds tax — without it, the credit is lost
Assuming a foreign client will withhold Thai tax — they generally can't, since they're outside Thai jurisdiction
Issuing invoices in English/USD without prior Revenue Department approval for the foreign-currency format

FAQ

Do I need to worry about WHT if I invoice a foreign client?

Generally no. WHT applies when the payer is a Thai juristic entity. A foreign client with no presence in Thailand isn't subject to Thai WHT rules and will pay your full invoiced amount.

What happens if a client doesn't give me a WHT certificate?

You can't claim the withheld amount as a tax credit without it. Follow up promptly — it's standard practice to request Form 50 Tawi at the same time payment is received.

Is the 7% VAT rate permanent?

No — the statutory rate is 10%, and 7% is a temporary reduction currently extended through 30 September 2027. Check for further extension as that date approaches.

Does WHT apply to every invoice?

No. It only applies when the payer is a juristic entity and the amount exceeds THB 1,000 (or forms part of a recurring contract that does). Payments from private individuals don't trigger WHT.

Thailand's dual VAT/WHT system has more moving parts than most neighbouring jurisdictions — always confirm current rates and thresholds with the Revenue Department or a qualified accountant before relying on any figure here for a filing decision. Create a compliant invoice free with BizAssets, no signup required.