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.
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.
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
- 2026-05-27
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.
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 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?+
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?+
Add or remove indirect tax from an amount and see tax and total values clearly for VAT, GST, HST, TVA, IVA, and similar systems.
How accurate is the Tax / VAT / GST Calculator?+
Tax / VAT / GST Calculator applies the formula and assumptions shown on this page. Results may be rounded for readability, so verify changing rates, thresholds, medical guidance, or legal rules with the cited source or a qualified professional.
What should I check before using the Tax / VAT / GST Calculator result?+
Check that the units, dates, rates, and assumptions match your situation. Change one input at a time to understand which values have the largest effect on the result.
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
Enter your details
Enter an amount and see tax and total values clearly, then complete any other fields shown in the calculator.
- 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
Compare scenarios
Change one or more inputs to see how they affect the tax / VAT / GST Calculator result before you use the estimate.
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