GST Invoice Calculator

Create a GST invoice with multiple items, discounts and GST rates. It calculates line totals, the CGST/SGST or IGST summary, round-off and amount in words. Print it or save it as a PDF.

What is the GST Invoice Calculator?

A tax invoice lists goods or services supplied with their taxable value and GST. Invoices with items at different GST rates need a rate-wise tax summary.

How does it work?

For each line: taxable value = qty × rate − discount, GST = taxable × rate. Totals are summed in paise to avoid rounding errors, grouped by GST rate, and the grand total is rounded to the nearest rupee with the round-off shown.

Formula

Line taxable = Qty × Rate × (1 − Discount%)
Line GST = Taxable × GST%

Example

Design services of ₹25,000 at 18% plus 500 brochures at ₹12 with 10% discount at 5%: taxable ₹30,400, GST ₹4,770, total ₹35,170.

Frequently asked questions

Is my invoice data stored?

No. Everything stays in your browser. Nothing you type is sent to our servers.

What must a GST invoice contain?

Supplier and recipient details with GSTIN, invoice number and date, HSN/SAC codes, taxable value, rate and amount of each tax, place of supply and signature.

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