E-invoicing non compliance: consequences and cure
An invoice without a reference number is not an invoice. The consequence lands on your customer as much as on you.
Where e-invoicing applies, an invoice issued without obtaining an invoice reference number from the portal is not a valid invoice under Rule 48(5), with the consequence that the document does not satisfy the invoice requirement in Section 16(2)(a) for the recipient's credit and the supplier faces penalty under Section 122. Applicability is by notified aggregate turnover threshold, determined by turnover in any preceding financial year from 2017-18 onwards, and the reporting window for uploading invoices to the portal has been restricted for taxpayers above the specified turnover.
The consequences
For the supplier, penalty under Section 122 for issuing an incorrect or invalid invoice, and the risk that the outward supply is treated as made without an invoice.
For the recipient, denial of credit on the ground that the document is not a valid tax invoice. This is the consequence that actually causes commercial damage, because customers stop paying.
A mismatch between e-invoice data and GSTR-1, which is a standard audit finding since the portal auto populates from the e-invoice data.
Where the reporting window has expired, the invoice cannot be reported at all, and the position must be corrected through a credit note and a fresh invoice within the permitted period.
The cure
Where the omission is recent and within the reporting window, generate the invoice reference number and reissue the document to the customer.
Where the window has passed, issue a credit note against the invalid invoice and a fresh compliant invoice, within the time limits, and inform the customer so its credit position is corrected.
Where the customer has already availed credit on an invalid invoice, coordinate the correction; a customer that discovers the defect in its own audit will treat it as a supplier failure.
Document the cause — a system failure, a new branch not configured, a document type omitted — because a systemic cause with a documented fix answers the penalty.
The controls
Determine applicability once a year against the notified threshold, using turnover in any preceding financial year from 2017-18 onwards, and record the determination.
Cover every document type: tax invoices, credit notes, debit notes, export invoices and supplies to notified categories, and every branch and every billing system.
Reconcile e-invoice data to GSTR-1 monthly; the auto population makes a difference visible immediately.
Monitor the reporting window daily where it applies, because an unreported invoice after the window cannot be regularised except by credit note and reissue.
What to do on Monday
Record the e-invoicing applicability determination annually, with the turnover working.
Audit every branch, billing system and document type for coverage, not just the main sales invoice.
Reconcile e-invoice data to GSTR-1 every month.
Monitor the reporting window daily and escalate unreported invoices the same day.
This page states the general position. A reader with a specific question on their own facts may write to the GST practice at AMLEGALS.
Write to the GST practiceQuestions we are asked on this
Is an invoice without an invoice reference number valid?
No. Rule 48(5) provides that such a document is not an invoice, which affects the recipient's credit.
Which turnover decides applicability?
Aggregate turnover in any preceding financial year from 2017-18 onwards, against the notified threshold. Verify the current threshold.
Can we report an old invoice?
Only within the reporting window where one applies. After it, use a credit note and a fresh invoice.
Do credit notes need an invoice reference number?
Where e-invoicing applies to you, the notified document types include credit and debit notes. Cover all of them.
Does the customer lose credit?
The department takes that position where the document is not a valid invoice. Correct it promptly and inform the customer.
In this cluster
- GST audit under Section 65: the clock, your rights and the first reply
- Special audit under Section 66: when an accountant is appointed against you
- ADT-01 to ADT-04: the audit paper trail
- The eleven findings that appear in almost every departmental audit
- GSTR-9 and GSTR-9C: reconciliation exposure and correction strategy
- Turnover reconciliation between GST, income tax and the financial statements
- Section 35(6): tax on goods not accounted for
- Audit objections versus anti evasion investigation: two different files
- Building the audit defence file before the audit begins
GST Insights is published by AMLEGALS for general information. Law stated as on 3 September 2026. Not advice on any particular set of facts; not an advertisement or a solicitation under Rule 36 of the Bar Council of India Rules. Readers with a question on their own facts may write to the GST practice of their own accord.