GST Invoice Calculator

Build the numbers for a GST invoice or quotation line by line. Copy the totals into your billing software or use our invoice templates.

Quick answer

For each line, taxable value = quantity × rate − discount; GST = taxable value × GST%. The invoice total is the sum of taxable values plus the sum of GST, split into CGST + SGST for intra-state or IGST for inter-state supply.

How to use the GST Invoice Calculator

Add a row for each item: description, quantity, rate, discount %, GST %.
Choose intra-state or inter-state.
Read the per-line and total tax breakup.

Worked example

10 units at ₹250 with 18% GST: taxable ₹2,500, GST ₹450, total ₹2,950.

Formula

Line taxable = Qty × Rate × (1 − Disc ÷ 100)
Line GST = Line taxable × GST ÷ 100

Frequently asked questions

Is round-off allowed on a GST invoice?

Yes, rounding the invoice total to the nearest rupee is common practice; show the round-off amount as a separate line.

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