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A GST calculator computes GST from a base price or determines the tax portion of a GST-inclusive price.
For a GST-exclusive price, GST amount = price × GST rate. The final price is base price + GST.
For an inclusive price, the tax portion is generally total × rate/(100 + rate), depending on the jurisdiction’s rules.
GST rates and rules vary by country and can change, so use the rate applicable to the transaction and date.
Use it to estimate invoices, retail prices, and tax-inclusive or tax-exclusive amounts.
Do not assume one country’s GST treatment applies elsewhere; exemptions, input credits, and rounding can differ.
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