A GST invoice isn't just a bill — it's a legal document that determines whether your buyer can claim input tax credit. Missing fields can invalidate it. Here's exactly what a compliant tax invoice must contain.
Mandatory fields on a GST invoice
- Your business name, address, and GSTIN.
- A unique, sequential invoice number and the invoice date.
- Customer name, address, and GSTIN (for B2B).
- HSN code for goods or SAC code for services.
- Description, quantity, unit, and taxable value of each item.
- The GST rate and the tax amount split into CGST + SGST (same state) or IGST (inter-state).
- Place of supply, especially for inter-state sales.
- Total invoice value in figures.
CGST/SGST vs IGST — the split
For a sale within your own state, the tax splits equally into CGST (central) and SGST (state). For a sale to another state, the whole tax applies as IGST. Getting this wrong is one of the most common invoicing errors — the total is the same, but the split must match the place of supply.
Never worry about the fields again
BizGST Pro builds every mandatory field into each invoice automatically — the correct tax split based on state, HSN codes from your item master, and sequential numbering. You fill in the customer and items; the compliance is handled.