Tax arithmetic

GST calculator

Work out one invoice line, including or excluding GST, with an exact paise-level tax split.

JavaScript is required

These tools process your files locally in the browser, so the page needs JavaScript to run them. Nothing is uploaded to a server.

Formula and limits

For an exclusive price, GST is taxable value × rate ÷ 100. For an inclusive price, taxable value is total ÷ (1 + rate ÷ 100). Intra-state GST is split between CGST and SGST; inter-state GST is shown as IGST. Amounts are rounded to paise on this one invoice line. This arithmetic tool does not determine the legally applicable rate, place of supply, exemptions or filing obligations.

See the CBIC inclusive-tax rule and CBIC GST overview.

GST calculator

Invoice-line breakdown

Formula and limits