GST Invoice Format: Complete Guide for Indian Businesses (2026)
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A GST tax invoice is the primary document for registered supplies in India. Wrong fields or tax splits create return mismatches and buyer ITC issues. Use this as a practical checklist — not a substitute for your CA.
Key Takeaways
- Rule 46-style fields: number, date, supplier/buyer, HSN/SAC, tax breakup.
- Intra-state → CGST+SGST; inter-state → IGST (place of supply matters).
- Keep a unique sequential series for the financial year.
- Generate a draft fast with MsgBill, then verify before filing.
Mandatory Fields (Practical List)
- Invoice number & date — consecutive; letters/numbers/hyphen/slash only.
- Supplier — name, address, GSTIN.
- Recipient — name, address; GSTIN for typical B2B.
- HSN/SAC — digit rules depend on turnover; when in doubt, ask your CA.
- Tax breakup — CGST/SGST or IGST, rate and amount per line or summary.
- Place of supply — drives IGST vs CGST/SGST.
- Signature / digital acknowledgement as applicable to your process.
CGST + SGST vs IGST
Same state supply usually splits the rate into CGST and SGST. Different state supply usually charges IGST at the full rate. Reverse charge and special categories need professional advice.
Common Mistakes
- Missing place of supply.
- Wrong slab (e.g. 18% on a 5% item).
- Duplicate or reset invoice numbers mid-year.
- Sending only a WhatsApp text without a proper PDF for B2B ITC.
E-Invoice Note
Businesses above the notified turnover threshold must generate IRN via the Invoice Registration Portal. Thresholds change — confirm the current limit before assuming you are exempt.
Create a Clean Format Fast
Use the free GST invoice generator to draft CGST/SGST or IGST bills, download PDF, and share on WhatsApp. Sign up later for ad-free storage.
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Free GST bills on WhatsApp — no login required on the generator.