Tax calculator

Thailand Reverse VAT Calculator

Remove VAT from a VAT-inclusive amount.

Last reviewed: 14 September 2026

Enter details

Calculation result
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Calculated in your browser. Values are not sent to ThaiUtility.

Quick answer

Enter an inclusive total and rate to separate the pre-VAT base and VAT.

Formula

Price before VAT = total ÷ (1 + rate ÷ 100); VAT = total − price before VAT.

Worked example

10,700 baht including 7% VAT

The base is 10,000 baht and VAT is 700 baht.

Choose this tool when

Use this page for a confirmed VAT-inclusive total. It does not add VAT to a pre-tax price or determine whether VAT applies.

Assumptions and limitations

  • Use only when the amount genuinely includes VAT.
  • Document rounding may differ by a few satang.

Official sources

Last reviewed: 14 September 2026

Review again when the responsible authority changes the rule, rate, or effective period, or when this calculator's assumptions change.

Check the current Thai text and effective dates before relying on a result for tax, billing, employment, or legal purposes.