GST Calculator
Calculate GST on a taxable value using the applicable tax rate.
Open toolIndirect tax tools
Lightweight GST and business calculators for planning, internal checks and educational review. Each tool explains its purpose, formula, example and limitations so users understand the calculation before relying on it.
These tools are support aids, not accounting software and not a substitute for review by a qualified tax professional. Use accurate rates, due dates and legal classifications before finalising any return, invoice or payment.
Reverse GST Calculator
Extract base value and GST from an inclusive invoice amount.
Open toolProfit Margin Calculator
Estimate profit, margin and markup for advisory pricing or goods trading.
Open toolInvoice Total Calculator
Calculate taxable value, discount, GST and final invoice total.
Open toolLate Fee Calculator
Estimate late fee based on delay days, per-day rate and maximum cap.
Open toolInterest Calculator
Estimate simple interest on delayed indirect-tax payment.
Open tool