GST Calculator
Add GST to a base price, or work back from a GST-inclusive amount — with the CGST / SGST or IGST split for your invoice.
Calculate GST
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From 22 September 2025 the main GST rates are 5% and 18%, with 40% for specified demerit goods. 12% and 28% are shown only for invoices issued before that date.
Total incl. GST
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Taxable value
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GST amount
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