Calculate Goods and Services Tax amounts with inclusive/exclusive pricing for Australia, India, Canada, and other GST countries.
A GST price can be either a pre-tax amount waiting for tax or a tax-inclusive total that already contains it. GST Calculator handles both interpretations for Australia, India, Canada, and other GST jurisdictions: enter an amount, use the applicable percentage, and identify whether GST is included. It reports the tax portion and the corresponding before-tax and after-tax prices. The common mistake is multiplying an inclusive total directly by the stated rate. That overstates the embedded GST because the rate applies to the price before GST, not the already-taxed total.
A concrete input and expected output from the current implementation.
Input
Amount: 110.00 GST rate: 10% Pricing: GST-inclusive
Expected output
GST amount: 10.00 Price excluding GST: 100.00 Price including GST: 110.00
The embedded GST is 110.00 x 10 / 110 = 10.00. Subtracting 10.00 from the inclusive price leaves the 100.00 pre-tax amount.
With GST-exclusive pricing, the entered amount is the base. The tax is the base multiplied by the rate and divided by 100, and the inclusive total is the base plus that tax. For 100.00 at 10%, the tax is 10.00 and the total is 110.00. Use this direction when a quote or line item is stated before GST.
With GST-inclusive pricing, the entered amount is the final total. The embedded tax is the total multiplied by the rate and divided by 100 plus the rate, not simply the total multiplied by the percentage. The exclusive amount is the final total minus the embedded tax. This calculation keeps the recovered base and GST equal to the original inclusive amount.
No. If 110.00 already includes GST at 10%, subtracting 11.00 would incorrectly leave 99.00. Divide the inclusive price by 1.10, or use the calculator's inclusive setting. The correct base is 100.00 and the embedded GST is 10.00. In general, divide by 1 plus the decimal tax rate to recover the base.
No. Applicable rates and classifications can depend on the jurisdiction, type of goods or services, place of supply, customer, and transaction date. Some systems also distinguish GST, HST, or separate provincial and state taxes. Use the calculator to check the price arithmetic after confirming the applicable treatment through current official guidance or a qualified adviser.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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