GST Invoice Format: Mandatory Fields & Sample

Last updated: 2 July 2026 · 6 min read

A GST tax invoice is a legal document, and it must contain specific fields to be valid and to let your customer claim input tax credit. Here is exactly what to include, plus a clean sample layout you can reproduce.

Mandatory fields

1. Supplier's name, address and GSTIN.
2. A consecutive invoice number (unique for the financial year) and the date of issue.
3. Recipient's name, address and GSTIN (if registered).
4. Place of supply (and state code) for inter-state transactions.
5. HSN code (goods) or SAC (services).
6. Description, quantity and unit of the goods/services.
7. Taxable value and any discount.
8. GST rate and amount, split into CGST + SGST or IGST.
9. Total value in figures and in words.
10. Signature or digital signature of the supplier/authorised signatory.

Sample layout

A clean invoice puts the seller block and logo at the top, the buyer and invoice metadata below it, then an items table (with HSN, quantity, rate, GST and amount), a right-aligned totals panel, the amount in words, and a footer with terms and a signatory line. The GST bill generator produces exactly this layout and fills the tax split automatically.

Bill of Supply vs tax invoice

If you are not charging GST — for example as a composition dealer or for exempt goods — you issue a Bill of Supply instead, which omits the tax columns.

Related: GST bill vs invoice, GSTIN format, HSN finder.