The 60-second version
E-invoice mandatory above notified turnover threshold — IRN from IRP within 30 days of invoice. I register on NIC portal, map ERP, and train staff before first B2B bill.
B2B invoice without IRN is invalid for mandated taxpayers
Returning founders crossing turnover threshold must generate Invoice Reference Number on NIC IRP before sending B2B invoice to customer.
QR code on PDF is mandatory display — customers reject invoices without valid IRN for ITC claim.
Composition taxpayers and B2C supplies excluded — know your supply mix before enabling.
Annual close: GSTR-9 guide.
E-invoice applicability
| Supply type | E-invoice? | Notes |
|---|---|---|
| B2B domestic | Yes if mandated | IRN required |
| B2C retail | No | Normal invoice |
| Exports | Yes if mandated | LUT / bond separate |
| SEZ supplies | Yes if mandated | Special fields |
| Composition dealer | No | Bill of supply instead |
E-invoice go-live sequence
Check threshold
Confirm turnover crosses notified limit.
IRP registration
GSTIN + DSC on e-invoice portal.
ERP mapping
Tally / Zoho / SAP IRP API credentials.
Test IRN
Sandbox invoice to self B2B.
Train billing team
No manual PDF without IRN for B2B.
IRN flow
E-invoice kit
- GSTIN.
- DSC token.
- ERP API key.
- Sample B2B invoice.
- QR print template.
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Penalty
B2B invoice without IRN when mandated — recipient ITC blocked + penalty risk.
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Freelancer below threshold?
Not mandated — monitor rolling turnover quarterly.
PDF without QR?
Invalid for mandated B2B — regenerate with IRN.
Multiple GSTINs?
Separate IRP registration per GSTIN.
Credit note?
Linked IRN reference mandatory on CN.
Export e-invoice?
Yes with export category fields when mandated.
API downtime?
NIC contingency procedures — retry queue in ERP.
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