Thai VAT & Withholding Tax Calculator
Calculate Thai VAT and withholding tax in one place. Switch between adding 7% VAT on top of a price or extracting the VAT already included, then use the withholding-tax tab to work out 1%, 2%, 3% or 5% on the pre-VAT base. See the tax withheld, the net paid to your supplier and a full invoice breakdown — all calculated instantly in your browser, with no sign-up and nothing sent to a server.
Thailand standard rate is 7%. Change it only for special cases.
Withholding tax is always calculated on the pre-VAT amount, never on the VAT-inclusive total.
Enter any rate from 0 to 100.
Your results will appear here
Enter an amount to see the VAT and withholding-tax breakdown.
Base (pre-VAT) The price before VAT — the figure withholding tax is calculated on.
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VAT amount Base x VAT rate. This is the VAT you charge or pay.
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Total (incl. VAT) Base + VAT — the gross amount on the invoice.
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WHT rate The withholding percentage applied to the pre-VAT base.
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WHT withheld Base x WHT rate — the amount the payer keeps and remits to the Revenue Department.
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Net paid to supplier What the supplier actually receives after tax is withheld.
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Invoice breakdown (with VAT)
| Item | Amount |
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VAT is added to the invoice, but withholding tax is deducted from the pre-VAT base only. The supplier still owes the withheld amount to the Revenue Department via your withholding certificate.
How to use
- Choose the VAT tab or the Withholding tax tab.
- For VAT, enter the amount and pick whether it excludes or includes VAT; the base, 7% VAT and total update instantly.
- For withholding tax, enter the pre-VAT amount and select the payment type — 1% transport, 2% ads, 3% service, 5% rent, or a custom rate.
- Tick "invoiced with VAT 7%" to see the full invoice: base plus VAT minus withholding on the base.
- Click Copy summary to paste the figures into an invoice, email or accounting note.
Features
- Add VAT on top or extract VAT already included in a price
- Editable VAT rate (default 7%) for zero-rated or special cases
- Preset withholding rates: 1% transport, 2% advertising, 3% service, 5% rent, plus custom
- Combined service invoice: base + VAT − withholding on the pre-VAT base
- THB-formatted results with base, tax and net amounts
- 100% in-browser — your figures never leave your device