Common E-Invoice Rejection Errors and How to Fix Them
Rohit Menon
· Founder & Product Architect· 3 min read
The Invoice Registration Portal validates strictly and rejects rather than warns. Most rejections fall into a handful of categories, and almost all of them originate in master data rather than in the invoice itself.
- ✓Duplicate IRN means the invoice number was already registered this financial year.
- ✓Invalid or inactive GSTIN is the commonest recipient-side failure.
- ✓Documents older than the reporting window are rejected outright.
- ✓Validation before submission is cheaper than correction after.
Duplicate IRN
The IRN is computed from supplier GSTIN, document type, document number and financial year. Submitting the same combination twice returns a duplicate error.
Causes are usually a retry after a timeout where the first attempt actually succeeded, or an invoice number reused after a cancellation. Query the portal for the existing IRN before re-submitting — the first registration may well have gone through.
GSTIN problems
An invalid, cancelled or suspended recipient GSTIN is rejected. So is a GSTIN whose State code does not match the place of supply where the supply is intra-State.
This is a master data problem rather than an invoicing one. Periodic bulk validation of customer GSTINs against the portal catches cancellations before they reach the invoicing stage.
Date and value errors
A document dated beyond the permitted reporting window is rejected outright — thirty days for taxpayers at or above ten crore rupees of turnover. Future-dated documents are also rejected.
Value mismatches between line items and totals, beyond the tolerance the schema allows, are a frequent cause. Rounding differences accumulated across many lines are the usual culprit.
Classification errors
An HSN code not found in the portal's master, or fewer digits than your turnover requires, produces an error. Tax rates inconsistent with the HSN may also be flagged.
Maintaining HSN in the item master with the right number of digits, rather than entering it per invoice, eliminates most of this category.
Frequently asked questions
### What does duplicate IRN mean?
The combination of supplier GSTIN, document type, document number and financial year has already been registered. Often the first submission succeeded despite a timeout — query the portal for the existing IRN before issuing a new invoice number.
### Why was my e-invoice rejected for GSTIN?
The recipient GSTIN is invalid, cancelled or suspended, or its State code conflicts with the place of supply. Periodic bulk validation of customer GSTINs prevents this reaching the invoicing stage.
### Can I register an invoice dated last month?
Only within the reporting window. Taxpayers with turnover of ten crore rupees or more must report within thirty days of the document date; beyond that the portal rejects it and a fresh invoice is required.
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Frequently Asked Questions
What does duplicate IRN mean?
The combination of supplier GSTIN, document type, document number and financial year has already been registered. Often the first submission succeeded despite a timeout — query the portal for the existing IRN before issuing a new invoice number.
Why was my e-invoice rejected for GSTIN?
The recipient GSTIN is invalid, cancelled or suspended, or its State code conflicts with the place of supply. Periodic bulk validation of customer GSTINs prevents this reaching the invoicing stage.
Can I register an invoice dated last month?
Only within the reporting window. Taxpayers with turnover of ten crore rupees or more must report within thirty days of the document date; beyond that the portal rejects it and a fresh invoice is required.
Rohit Menon
Founder & Product ArchitectArchitecting business document operating systems and automated billing workflows for Indian SMBs, agencies, and enterprises.