Finance calculator

Tax / VAT / GST Calculator

Add or remove indirect tax from an amount and see tax and total values clearly for VAT, GST, HST, TVA, IVA, and similar systems.

FormulaTax amount = base x rate / 100; pre-tax amount = inclusive amount / (1 + rate / 100)

Formula

Indirect tax formulas

Tax names and rules vary by country and region. The same type of tax may be called VAT, GST, HST, TVA, IVA, sales tax, or another local name. Confirm the applicable rate before billing or filing.

Tax amount = base x rate / 100; pre-tax amount = inclusive amount / (1 + rate / 100)

At 18% tax, 1,000 before tax has 180 tax and total 1,180.

SourcesThis profile covers generic VAT, GST, HST, and similar indirect-tax calculations. The calculator applies the rate entered by the user; it does not choose the legally correct rate for a product, province, state, or filing situation.

Sources and assumptions

Indirect tax source notes

This profile covers generic VAT, GST, HST, and similar indirect-tax calculations. The calculator applies the rate entered by the user; it does not choose the legally correct rate for a product, province, state, or filing situation.

Effective year
2026
Last verified
2026-06-23

Tax names and rules vary by country and region. The same type of tax may be called VAT, GST, HST, TVA, IVA, sales tax, or another local name. Confirm the applicable rate before billing or filing.

Official and reference sources

Assumptions

  • The user enters the applicable tax rate.
  • Amounts are rounded for display after the core calculation is complete.
  • Inclusive tax removal uses amount / (1 + rate / 100).
  • The calculation treats the whole amount as taxable at one rate.

Not included

  • Rate selection for specific goods, services, exemptions, or place-of-supply rules.
  • Input tax credits, reverse charge, composition schemes, filing rules, penalties, and invoice compliance.
  • Multi-rate invoices and province, state, or municipal differences unless entered manually.
FAQ6 common questions for this calculator.

FAQs

Can I remove tax from an inclusive price?+

Yes. Use the inclusive calculation to split the price into pre-tax amount and tax.

Which indirect tax rate should I use?+

Use the rate that applies to your product, service, and jurisdiction.

How does the Tax / VAT / GST Calculator calculate the result?+

For the Tax / VAT / GST Calculator, it uses the Indirect tax formulas: Tax amount = base x rate / 100; pre-tax amount = inclusive amount / (1 + rate / 100). At 18% tax, 1,000 before tax has 180 tax and total 1,180.

What information do I need to use the Tax / VAT / GST Calculator?+

For the Tax / VAT / GST Calculator, enter an amount and see tax and total values clearly. Keep the units consistent with the calculator fields and compare your setup with the worked example on the page.

How accurate is the Tax / VAT / GST Calculator?+

Tax / VAT / GST Calculator is accurate for the rates, amounts, dates, and rules entered. It uses the Indirect tax formulas shown on this page. Real products can differ because of fees, taxes, contract terms, or changing official thresholds.

What should I check before using the Tax / VAT / GST Calculator result?+

For the Tax / VAT / GST Calculator, check an amount and see tax and total values clearly, then compare the Indirect tax formulas and worked example with the contract or source you will rely on. Fees, tax year, currency, and payment timing can change the final decision.

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Finance guide

How to use the Tax / VAT / GST Calculator

Add or remove indirect tax from an amount and see tax and total values clearly for VAT, GST, HST, TVA, IVA, and similar systems. The page also explains the indirect tax formulas and shows a practical example: At 18% tax, 1,000 before tax has 180 tax and total 1,180.

  1. 1

    Enter your details

    Enter an amount and see tax and total values clearly, then complete any other fields shown in the calculator.

  2. 2

    Check the calculation

    Review the result alongside the indirect tax formulas: Tax amount = base x rate / 100; pre-tax amount = inclusive amount / (1 + rate / 100).

  3. 3

    Compare scenarios

    Change one or more inputs to see how they affect the tax / VAT / GST Calculator result before you use the estimate.