What Makes a GST-Compliant Invoice? A Complete Checklist

A GST invoice missing even one required field can cause problems for your customer trying to claim input tax credit, not just for you. Here's what a compliant invoice actually needs.

Seller and buyer details

• ✓ Your business name, address, and GSTIN
• ✓ Customer's name and address
• ✓ Customer's GSTIN, if they're GST-registered

Invoice identification

• ✓ A unique, sequential invoice number
• ✓ Invoice date
• ✓ Place of supply, when it's an inter-state transaction

Line item details

• ✓ Description of goods or services
• ✓ HSN code (goods) or SAC code (services)
• ✓ Quantity and unit
• ✓ Unit price and taxable value

Tax breakdown

• ✓ GST rate applied
• ✓ CGST and SGST amounts (same-state sale), or IGST amount (inter-state sale) - shown separately, not combined
• ✓ Total invoice value, tax included

Signature

• ✓ Signature or digital signature of the supplier or an authorized representative

The part that's easy to get wrong by hand

Individually, none of these fields are complicated. What actually causes mistakes is doing the CGST/SGST-versus-IGST split correctly on every single invoice, remembering HSN/SAC codes for every product, and keeping invoice numbers sequential without gaps - especially once you're issuing dozens of invoices a week. This is less about any one field being hard, and more about consistency across every invoice you ever issue.