Writing a VAT invoice in Thailand: what to include

Published April 27, 2026 · 2 min read

The details a VAT invoice in Thailand normally needs, how to lay out tax per line, and a worked invoice example at 7%.

Details most tax authorities expect

A valid tax invoice usually shows the seller name, address and tax registration number, the buyer details, a unique sequential invoice number, the invoice date, a clear description of each item, quantity and unit price, the rate applied and the amount of tax, and the total due. Exact requirements differ, so confirm the list for Thailand.

Worked example

Here is the calculation with sample figures. Change any number in the Thailand Invoice VAT Calculator to run your own.

Net, tax and gross on every invoice

Show the net amount, the VAT at 7% and the gross total separately. Customers who are registered need that breakdown to reclaim the tax, and it makes your own reconciliation straightforward.

Credit notes

If you need to correct an invoice, issue a credit note that references the original rather than editing or deleting it. The credit note reverses the tax as well as the net amount.

Quick reference at 7%

Common amounts in Thailand, worked both ways: adding tax to a net price, and extracting it from a price that already includes tax.

How Thailand compares

Standard rates on file for other countries. A difference of a few points matters most on high-value purchases and on cross-border sales.

Using the calculator step by step

1. Open the Thailand Invoice VAT Calculator.
2. Type your figures into the numbered lines. Results update as you type.
3. Check the rate field. It starts at 7%; change it if a reduced rate, local surcharge or exemption applies to you.
4. Read the result on the receipt panel, and use the formula shown under it if you need to explain the figure to a client or colleague.

Key terms

Gross amount

The amount after tax is added, which is usually what a consumer pays.

Marginal rate

The rate applied to the next unit of income. It decides how much of a raise or a deduction you keep.

Taxable income

Income left after allowances and deductions, on which the tax rates are applied.

Zero rate

A rate of 0% on a taxable supply. Unlike an exemption, the seller can usually still reclaim tax on costs.

Tax credit

An amount subtracted directly from the tax bill, worth its full face value.

Common mistakes to avoid

• Leaving out the tax registration number.
• Reusing or skipping invoice numbers.
• Showing only a tax-inclusive total.

Frequently asked questions

This article is general information for planning, not tax advice. Rates and rules change; confirm with your tax authority or a qualified adviser.