E-Invoicing and GST Data Matching: What Businesses Must Reconcile in 2026
Current position
E-invoicing generally applies to prescribed B2B, export and related documents of registered persons whose aggregate turnover crossed ₹5 crore in any relevant preceding financial year, subject to notified exclusions. From 1 April 2025, taxpayers with aggregate annual turnover of ₹10 crore or more cannot report covered e-invoices to the IRP after 30 days from the invoice date. Entity exclusions and document scope must be checked before implementation.
How it works
The invoice is first created in the supplier’s system and prescribed data is reported to an Invoice Registration Portal. A valid IRN and signed QR code are generated. The same data can feed GST return and e-way-bill processes, increasing the visibility of mismatches.
A recipient should not rely only on a supplier’s PDF. It should reconcile GSTIN, document type, tax values, place of supply, IRN status, GSTR-2B availability and commercial receipt.
Cancellation, credit notes and amendments follow prescribed workflows. A back-dated accounting adjustment cannot always repair a missed IRP reporting window.
| Issue | Current position | Why it matters |
|---|---|---|
| General threshold | ₹5 crore aggregate turnover | Relevant preceding financial year; exclusions apply |
| Reporting restriction | 30 days from invoice date | AATO ₹10 crore or more from 1 April 2025 |
| Core output | IRN and signed QR code | Not merely an invoice PDF |
Practical example
A company with ₹18 crore turnover issues a B2B invoice on 1 June but tries to report it on 5 July. The 30-day restriction can prevent IRP reporting. The finance team must investigate the operational failure, issue the legally appropriate document or correction, and assess GST return and customer-credit consequences rather than simply altering the invoice date.
Action checklist
- Map GST registrations, turnover history, document types and exclusions.
- Block dispatch or billing where IRN generation fails.
- Reconcile ERP invoices, IRP data, e-way bills, GSTR-1 and GSTR-2B.
- Monitor the 30-day clock for entities at or above ₹10 crore AATO.
- Review cancelled IRNs, credit notes and manual journal entries monthly.
Evidence and document checklist
- IRP acknowledgement, IRN and signed QR data.
- Invoice and credit/debit-note register.
- GSTR-1/IFF and GSTR-2B reconciliation.
- E-way bills and dispatch records.
- ERP exception log and user audit trail.
Common mistakes
- Using the registration threshold as the e-invoice threshold.
- Assuming every registered person is covered.
- Changing invoice dates to bypass a reporting restriction.
- Claiming input tax credit solely because a PDF exists.
Red flags
- Large manual invoice series outside the ERP.
- IRNs generated after dispatch.
- Repeated GSTIN or place-of-supply corrections.
- GSTR-1 values differ materially from the sales ledger.
Escalation and complaint route
Use GST portal and IRP help channels for technical errors and preserve ticket evidence. Material tax, credit or document-validity issues require a GST professional and, where necessary, jurisdictional clarification.