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GST Invoice Format India: What Goes on It (With Free Generator)

Every mandatory GST invoice field — GSTIN, HSN/SAC codes, place of supply, tax breakup — explained with a free browser-based generator that never uploads your bills.

Kirtiwardhan Rathore — Founder, Toolzum October 5, 2026 8 min read

A GST invoice is not just a bill — it is the document your input tax credit depends on. Get one field wrong and your client's accountant sends it back. Get the format right once, and every invoice after it takes two minutes.

TL;DR: a compliant GST invoice needs supplier and buyer GSTINs, invoice number and date, HSN/SAC codes per line item, taxable values, CGST+SGST (intra-state) or IGST (inter-state) breakup, place of supply, and total in words. Generate it free with the tools below — everything runs in your browser.

The 7 Mandatory Fields

  1. Supplier GSTIN and details — your GST identification number, name, and address as registered.
  2. Buyer GSTIN (for B2B) — wrong GSTIN means your client loses input credit. Verify before invoicing, every time.
  3. Invoice number and date — sequential, financial-year coded (e.g. INV/26-27/042). Gaps invite scrutiny.
  4. HSN/SAC codes per item — goods use HSN, services use SAC. Wrong codes are the most common compliance failure.
  5. Taxable value per line — quantity × rate, before tax.
  6. Tax breakup — CGST + SGST for same-state sales, IGST for inter-state. The place of supply decides which.
  7. Total in words — required on formal invoices; prevents tampering.

Generate One in Minutes

  1. Open the GST Invoice Generator and fill seller, buyer, and line items with HSN codes.
  2. Check the automatic CGST/SGST vs IGST split against the place of supply.
  3. Download the PDF and verify totals in words before sending.

For quick tax math outside invoices, the GST Calculator handles rate slabs instantly.

Honest Notes

This guide explains format, not tax law — rates and rules change yearly, so verify current slabs on the CBIC portal before filing. And keep invoice data local: browser-based generation means your client details never upload anywhere.

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