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List of ERP changes to be ready for e-Invoicing

Updated on: Sep 25th, 2022 - 1:58:12 PM

10 min read

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E-invoicing system requires modifications to the accounting/billing/ERP software as a one-time action at the time of implementation. It will help in the smooth functioning of the business. The following are possible changes and some recommendations for ERP software providers as well as the taxpayers to adopt and implement the e-invoicing system:

The list of ERP changes for smooth e-invoicing implementation are as follows:


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Latest Update

11th October 2022
The GST Council may implement the next phase of e-invoicing for businesses with an annual turnover of more than Rs.5 crore from 1st January 2023. The system may get extended to businesses with a turnover of over Rs.1 crore by the end of the next fiscal year.

1st August 2022
The e-Invoicing system for B2B transactions has now been extended to those with an annual aggregate turnover of more than Rs.10 crore up to Rs.20 crore starting from 1st October 2022, vide notification no. 17/2022.

24th February 2022
The e-Invoicing system will get extended to those annual aggregate turnover of more than Rs.20 crore up to Rs.50 crore starting from 1st April 2022, vide notification no. 1/2022.

Mandatory Fields as per e-Invoice Schema

In order for the invoices to be easily validated before being submitted to the IRP portal, ERP system should have integrated all the necessary fields as per the schema notified by the CBIC. In other words, the invoice issued by the billing/ERP software must cover all the mandatory fields stipulated by the GST law.

Separate treatment for B2B and B2C invoices

With effect from 1st October 2020, taxpayers with an aggregate turnover of more than Rs.500 crores in any preceding financial year (from 2017-18) must generate Invoice Reference Number (IRN) on the Invoice Registration Portal (IRP) for all B2B transactions.

Further, with effect from 1st January 2021, this extended to turnover of more than Rs.100 crore. Hence, the ERP will have to generate the JSON file and upload the same on the IRP separately. Further, the IRP would generate a QR code which needs to be printed on the invoice. At present, the e-invoicing system applies to businesses with more than Rs.20 crore annual turnover since 1st April 2022. The government has notified an extension of it to businesses with more than Rs.10 crore annual turnover from 1st October 2022.

Further, from 1st December 2020, taxpayers with an aggregate turnover of more than Rs.500 crore in any of the previous financial years (starting from 2017-18) are providing the dynamic QR code in their B2C invoices.

Identifying Type of transaction

The ERP software will have to classify a particular transaction into the following categories:

  • Business-to-Business (B2B)
  • Business-to-Government (B2G)
  • Exports
  • Supply through e-commerce operator
  • Supply liable to reverse charge

Details required as per Part A of the e-way bill will need to be entered only once.

Invoice Reference Number

The IRP will use a hash generation algorithm (SHA256) to generate an IRN for each invoice. The parameters for the hash generation would be:

  • GSTIN of supplier
  • Financial year
  • Document type (whether invoice, credit note or debit note)
  • Document number (assigned by the taxpayer)

Once the IRN for a particular invoice is successfully generated, the same should be printed on the hard copy of the invoice. Note: All the zeroes prefixed to the document number parameter will be ignored for hash generation.

Supports QR Code feature

From 1st April 2022, taxpayers with an aggregate turnover of over Rs.20 crore in any previous financial years (starting from 2017-18) must get the QR code printed on their B2B invoices, as issued by the IRP.

Further, in case their aggregate turnover in the previous financial year is Rs.500 crore or more, the same needs to be followed for B2C invoices too. Necessary changes must be incorporated into the IT systems.

Supports Digital Signature

While it is not compulsory for the taxpayer to digitally sign the JSON being uploaded into the IRP, the IRP will digitally sign JSON and send it back to the taxpayer.

Various APIs

In order to fully integrate with the e-invoicing system, the ERP software should provide for data exchange with the use of the following APIs:

  • Authentication
  • Generate IRN
  • Cancel IRN
  • Get e-invoice by IRN
  • Get GSTIN details 
  • Health Check API
  • Get IRN By Doc Details

Some best practices relating to the use of API have been prescribed:

  1. The e-invoicing system needs to be fully understood by the developers of the company
  2. Upon successful authentication, a token and a session encryption key (SEK) is obtained. This token is valid for six hours and hence need not be generated every time the ERP tries to connect to the system. It is advised to regenerate the new token within 10 minutes of expiry of the earlier token. The token and SEK should be used till its expiry time.
  3. ERP software should contain means to validate the data to ensure that it is as per the e-invoice schema
  4. A hard coding SSL certificate with the API interface should be avoided.
  5. The ERP software should wait for a response from the system, check and respond accordingly.


In order to use any of the abovementioned APIs, it is necessary to get authenticated. Authentication is done by entering client ID and password. The password would be encrypted using an e-invoice public key. All taxpayers covered under one PAN would be given a single client ID and password. 

Inbuilt Tool to reconcile GSTR-1 with Sales Register

The e-Invoicing system has allowed the sales invoice details to be autopopulated from the IRP onto the GSTR-1 on the GST portal. One must note that not all details will be autopopulated as B2C supplies are out of scope. Hence, it necessitates the need to reconcile autopopulated GSTR-1 or the IFF with the sales register and identify any gaps, so that no document is missed out before filing GSTR-1 for a month or quarter.

Linking to accounts payable and accounts receivable

The ERP software should provide a way to link the invoices generated to the accounts payable and accounts receivable module to ensure good debtors management and timely settlement of invoices. Further, ITC could be denied if payment is not made within 180 days of the date of invoice. Hence, ERP software can also incorporate payment reminders in this regard.

Tracking of cancelled invoices and cancelled e-way bills

The ERP software needs to, first of all, ensure that a unique document number is being assigned to every invoice. Further, even in case of a cancelled invoice, the same document number used by the cancelled invoice should not be used elsewhere. Hence there should be a system for tracking of cancelled invoices and cancelled e-way bills generated based on invoices. Invoices may only be available for cancellation on the IRP for 24 hours. Beyond 24 hours, the ERP software has to redirect the taxpayer to the GST portal to cancel the invoices.

Tracking of amendments

Amendments either can be made by cancelling old invoices and uploading JSON of new invoices and generating a fresh IRN or by issuing necessary credit notes/debit notes. There should be a way to link such credit notes/debit notes to the original invoices that needed amendment.

Storage of invoices

The IRP will not store invoices. The ERP software will have to provide for storage of invoices for easy reference at a future date. Further, much older invoices will need to be archived into a separate backup medium. 

Sending and Receiving e-Invoices

The ERP program should be able to auto-share such an invoice with the receiver after creating the IRN and signing the QR code for the generated invoice. This will assist the parties involved in the claim for the precise input tax credit (ITC) and the GST return file. Likewise, there must be feature to identify, record and store the e-invoices received from the respective suppliers.

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