GST Billing Compliance Checklist for Small Shops

A compliant GST invoice needs a few non-negotiable fields: a sequential invoice number, GSTIN of the supplier, HSN/SAC codes matched to the item, and a clear CGST/SGST or IGST split depending on whether the sale is intra- or inter-state.

The most common mistake isn't a missing field — it's an inconsistent invoice number sequence across multiple devices or staff members billing at the same counter. Pick one system as the source of truth for numbering, even offline, and sync afterward rather than generating numbers independently on each device.

Keep a running party ledger per customer if you extend credit (udhaar); GST doesn't require it, but reconciling payments against invoices later is far easier with one than without.