Compliance Guide 2026

GST Invoice Format in India

The Complete Guide to Rules, Templates & Compliance

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GST

What is a GST Invoice?

A GST invoice is a legal tax document issued by registered businesses. It serves as the primary evidence for the buyer to claim Input Tax Credit (ITC), effectively reducing their tax liability.

Tax

Who Must Issue?

Registered GST Businesses
Inter-state Suppliers
E-commerce Operators
Service Providers (> 20L Turnover)

Standard GST Invoice Structure

Every compliant invoice must contain these 10 essential data points.

Required Field	Legal Requirement / Description
Supplier Details	Legal Name, Address, and GSTIN of the seller.
Invoice Number	Consecutive serial number (unique for the financial year).
Recipient Details	Name, Address, and GSTIN of the buyer (if registered).
HSN / SAC Code	Classification of goods (HSN) or services (SAC).
Tax Breakup	Detailed split of CGST, SGST, or IGST amounts.

Mandatory Fields Checklist

Check Supplier GSTIN

Check Unique Invoice ID

Check Date of Issue

Check Recipient Address

Check HSN/SAC Codes

Check Taxable Value

Check IGST/CGST/SGST Rates

Check Digital Signature

Visual Example

SubtotalRs. 10,000

GST (18%)Rs. 1,800

TotalRs. 11,800

Valid Invoice

Compliance Rules

Invoices must be issued within 30 days of service delivery or at the time of removal of goods.

Common Mistakes

Incorrect GSTIN or missing HSN codes can lead to ITC rejection for your clients.

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