India’s e-Invoicing framework has transformed the way businesses issue, validate, and report invoices under the Goods and Services Tax (GST) regime. By introducing a centralized invoice registration process, the Indian government aims to reduce tax evasion, improve invoice authenticity, and simplify GST compliance through automated data exchange.
What is e-Invoicing in India?
An e-Invoice is a structured electronic invoice generated in accordance with the GST e-Invoice schema and reported to the Invoice Registration Portal (IRP). Unlike a PDF invoice, an e-Invoice is a machine-readable JSON document that is validated by the GST system before it is considered a valid GST e-Invoice.
Once successfully validated, the Invoice Registration Portal assigns a unique Invoice Reference Number (IRN) and digitally signs the invoice while generating a QR code. The supplier can then share the invoice with the customer in electronic or printed form.
What is a GST invoice?
A GST invoice is a bill of products or services provided to a customer by a supplier or service provider. It specifically indicates the services and products, along with the total transaction amount, as well as goods and services tax charged on them.
Is e-invoicing mandatory?
Yes. India has implemented mandatory e-Invoicing for Business-to-Business (B2B) transactions through a phased rollout approved by the GST Council.
The voluntary phase began on 1 January 2020, followed by mandatory implementation based on taxpayers’ aggregate annual turnover.
The e-Invoicing obligation currently applies to GST-registered businesses whose aggregate annual turnover exceeds ₹5 crore, unless specifically exempt under the GST regulations.
Who is eligible for e-Invoicing in India?
Eligible taxpayers can continue using their existing ERP or accounting systems by integrating them with the Invoice Registration Portal (IRP).
The implementation timeline is summarized below:
- October 2020 – Businesses with annual turnover exceeding ₹500 crore
- January 2021 – Businesses with annual turnover exceeding ₹100 crore
- April 2021 – Businesses with annual turnover exceeding ₹50 crore
- April 2022 – Businesses with annual turnover exceeding ₹20 crore
- October 2022 – Businesses with annual turnover exceeding ₹10 crore
- August 2023 – Businesses with annual turnover exceeding ₹5 crore
Invoices must be generated and submitted in the official GST e-Invoice JSON format before an Invoice Reference Number (IRN) can be assigned.
Who is exempt from e-Invoice in India?
Businesses whose aggregate annual turnover does not exceed ₹5 crore are generally outside the current e-Invoicing mandate.
In addition, certain categories of taxpayers remain exempt, including:
- Insurance companies
- Banking companies
- Financial institutions
- Non-Banking Financial Companies (NBFCs)
- Goods Transport Agencies (GTAs)
- Passenger transportation service providers
- Other entities specifically exempted by the GST Council or applicable GST notifications
How does GST e-Invoicing Work?
The GST e-Invoicing process consists of three main steps.
1. Invoice Generation
The supplier creates the invoice in its ERP or accounting system using the official GST e-Invoice schema.
2. Validation
The invoice data is submitted to the Invoice Registration Portal (IRP) through the official APIs.
After successful validation, the IRP:
- Generates a unique Invoice Reference Number (IRN)
- Digitally signs the invoice
- Generates a QR code
- Returns the validated invoice to the supplier
3. Invoice Distribution
The validated invoice, including the IRN-enabled QR code, is shared with the customer electronically or as a printed copy.
The QR code contains key invoice information including:
- Supplier GSTIN
- Recipient GSTIN
- Invoice Number
- Invoice Date
- Invoice Value
- Total GST Amount
The QR code enables offline verification using the official GST mobile application.
Invoice information is automatically shared with the GST ecosystem, allowing relevant GST return information and, where applicable, e-Way Bill data to be populated automatically.
How can SNI help you?
SNI provides an end-to-end India e-Invoicing solution that enables businesses to comply with the requirements established by the Goods and Services Tax Network (GSTN).
Our solution supports the complete invoice lifecycle, including invoice creation, data extraction, mapping, JSON generation, validation, Invoice Reference Number (IRN) generation, QR code processing, transmission, monitoring, reconciliation, and long-term archiving.
SNI automatically extracts invoice data from ERP systems and generates electronic invoices in accordance with the official GST e-Invoice JSON Schema. Before submission, invoice data is validated against the applicable GST business and technical rules, helping organizations minimize validation errors and reduce rejected documents.
For outbound invoices, SNI securely transmits invoice data to the Invoice Registration Portal (IRP) through the official APIs. The solution automatically retrieves the generated Invoice Reference Number (IRN), digitally signed QR code, acknowledgement details, and validation responses, enabling organizations to monitor the complete invoice lifecycle from a single platform.
For inbound invoice processing, SNI supports the automated retrieval and processing of structured invoice data, enabling seamless integration with ERP systems and downstream financial processes.
All inbound invoices are displayed in SNI’s Inbound Cockpit, providing centralized monitoring, invoice status tracking, structured invoice visualization, and human-readable HTML/PDF rendering. Users can monitor invoice statuses, validation responses, and document history through a single user-friendly interface.
SNI’s invoice reconciliation functionality automatically matches incoming invoices with purchase orders, delivery notes, or other ERP documents. This significantly reduces manual effort, improves processing accuracy, minimizes errors, and accelerates invoice approval and financial processing workflows.
Designed for maximum flexibility, SNI integrates seamlessly with both SAP and non-SAP ERP environments without requiring ERP upgrades. The solution supports SAP ECC 4.7 and higher, SAP ERP, SAP S/4HANA, and SAP Business Technology Platform (SAP BTP) while remaining fully ERP-independent for organizations using other enterprise systems.
With continuous monitoring of regulatory developments published by the GST Council, GSTN, and the Central Board of Indirect Taxes and Customs (CBIC), SNI ensures that customers remain aligned with the latest e-Invoicing requirements, technical schema updates, and compliance obligations while minimizing implementation effort and operational risk.