E-Invoicing Software for GST-Compliant IRN Generation

Munim is trusted by 1 Lakh+ businesses as a leading e-invoicing software solution in India. It combines one-click e-invoice creation, automatic IRN generation, bulk processing, smart validation, and secure cloud storage in a single affordable platform built for Indian GST rules.

E-invoicing is mandatory for businesses whose aggregate annual turnover (AATO) has exceeded ₹5 crore in any financial year from 2017-18 onwards. The mandate covers B2B supplies, B2G transactions, and exports. Once your turnover crosses this limit even once, the requirement continues to apply, and the software keeps you fully compliant from day one.

Categories that remain exempt from e-invoicing even if their turnover crosses ₹5 crore are listed below:

• Banks, NBFCs, and insurance companies.
• SEZ units (SEZ developers must still comply).
• Goods Transport Agencies (GTA).
• Passenger transportation service providers.
• Cinema multiplexes selling admission tickets.
• Government departments and local authorities.

If your business crosses the turnover limit, using a compliant GST e-invoicing platform is essential.

Yes, you have to generate an e-invoice if your business is notified under the mandate. An invoice issued without a valid IRN is treated as an invalid tax invoice under GST law. It can attract penalties and block your buyer’s Input Tax Credit. Munim removes this risk by generating IRNs automatically at the time of invoice creation.

The current threshold is ₹5 crore aggregate annual turnover, effective from 1 August 2023 under CBIC Notification No. 10/2023 – Central Tax. Turnover is calculated PAN-wide across all your GSTINs, in any financial year since 2017-18. Munim’s multiple GSTIN support makes compliance easy for businesses operating several registrations.

Small businesses below the ₹5 crore threshold are not required to generate GST e-invoices on the IRP. However, they can still use our app to create professional GST invoices, track payments, and stay audit-ready. Adopting an e-invoicing system early means zero disruption if the government lowers the threshold or your turnover grows past the limit.

No. E-invoicing applies only to GST-registered businesses, as the IRP validates each invoice against a valid GSTIN. Unregistered sellers can use the Munim app to create standard invoices and switch to e-invoicing once they obtain GST registration.

An IRN is a unique 64-character code assigned by the IRP to every authenticated e-invoice. It prevents duplication and confirms that the GST network has officially recognised your invoice. Our platform generates IRNs automatically, so every invoice you issue is valid, traceable, and ready for GST filing.

Effective 1 April 2025, businesses with an AATO of ₹10 crore or more must report invoices to the IRP within 30 days of the invoice date. Invoices uploaded after this window are rejected, no IRN is issued, and the document becomes invalid for GST purposes.

Businesses below ₹10 crore currently face no fixed reporting deadline, but real-time reporting is the safest practice. Munim submits invoices to the IRP the moment they are saved, helping you stay well within the government’s 30-day reporting window.

Key rules currently in force include:

• ₹5 crore threshold: Mandatory e-invoicing for businesses crossing this AATO in any year since FY 2017-18.
• 30-day reporting window: Applicable to taxpayers with AATO of ₹10 crore and above from April 2025.
• Valid IRN and QR code: Invoices without them are invalid, and buyers lose ITC eligibility.

Munim’s GSP/IRP integration is updated continuously, so your invoicing stays aligned with every regulatory change.

Check applicability: Confirm whether your aggregate turnover has crossed ₹5 crore in any year since FY 2017-18.

1. Register on the e-invoice portal: Enable your GSTIN for e-invoicing on the government’s Invoice Registration Portal.

2. Choose a compliant e-invoicing software: Pick a platform like Munim with direct GSP/IRP integration.

3. Generate and share: Create invoices as usual. The app validates, submits, and returns the authenticated e-invoice instantly.

1. Missing mandatory fields such as HSN codes, GSTINs, or place of supply, leading to IRP rejections

2. Delaying invoice reporting beyond the 30-day window (for ₹10 crore+ businesses)

3. Issuing invoices without an IRN or QR code, which makes them invalid under GST

4. Ignoring branch turnover, since the threshold applies PAN-wide across all GSTINs

5. Using non-integrated tools that require manual JSON uploads

6. Munim’s smart validation catches errors before submission, eliminating most of these mistakes automatically.

An e-invoice can be cancelled on the IRP within 24 hours of IRN generation. It handles cancellation within this window and updates your records automatically, keeping your books and GST data perfectly in sync. Beyond 24 hours, adjustments must be made through credit or debit notes.

Yes. Munim’s bulk e-invoice upload and processing lets you generate IRNs for hundreds of invoices. It is ideal for high-volume businesses, distributors, and enterprises that need fast, error-free GST e-invoice generation without repetitive manual work.

Munim’s GST e-invoicing software is available at ₹3,599/year (exclusive of 18% GST). It includes unlimited e-invoice creation, e-way bill generation, and access for 1 admin plus 1 user. That makes it one of the most affordable e-invoicing software solutions for Indian SMEs.

Yes. Munim offers a 7-day free trial with full access to e-invoice generation, bulk processing, reports, and GST validation. You can book a personalised demo to see how our platform fits your workflow before subscribing. The free trial helps you try out the best e-invoicing software for free.