GST Invoice Format: Complete Guide for Indian Businesses (2026)

Creating a GST-compliant invoice is mandatory for registered businesses. One mistake can lead to penalties. Here is your checklist.

Mandatory Fields for a Valid GST Invoice

• Invoice Number & Date: Must be consecutive and unique.
• Supplier Details: Name, Address, and GSTIN.
• Customer Details: Name, Address, and GSTIN (if registered).
• HSN/SAC Code: Mandatory for businesses with turnover > ₹5Cr (and recommended for all).
• Tax Breakdown: CGST, SGST, and IGST must be shown separately.

Common Mistakes to Avoid

1. Missing Place of Supply: Crucial for determining IGST vs CGST/SGST.

2. Incorrect Rates: Charging 18% on food items (5%) is a common error.

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