Twelve Invoicing Errors That Cost the Recipient Credit

Twelve Invoicing Errors That explained: this guide covers what it means, who it applies to, the step-by-step process, documents required, fees, due dates and penalties in India — so you can stay compliant with confidence and avoid costly mistakes.

Not every defective invoice denies credit. The proviso to Rule 36(2) rescues most of them. Six defects it does not rescue, and six it does — and treating the second group as fatal wastes effort while treating the first as curable loses money.

Fatal: no IRN where e-invoicing applies; wrong recipient GSTIN; no tax amount; no place of supply on an inter-State invoice; a bill of supply instead of a tax invoice; and a document from a supplier who never reported it. Curable or harmless: wrong or missing HSN; a defective serial number; no signature; a wrong address; a wrong description; and tax charged under the wrong head.

The six fatal defects

1. No IRN where e-invoicing applies. Rule 48(5) makes the document not an invoice. Nothing in Rule 36(2) can rescue a document that is not an invoice. Fix: the supplier must issue a fresh, IRN-carrying invoice. An invoice without an IRN →

2. Wrong recipient GSTIN. The credit belongs to whoever the GSTIN names. An invoice to a group company's GSTIN does not give you credit. And it will appear in their GSTR-2B, not yours. Fix: the supplier amends the invoice in GSTR-1, or issues a credit note and a fresh invoice.

3. No amount of tax. The first of the six essentials in the proviso to Rule 36(2), and the amount of the credit itself. Fix: corrected invoice.

4. No place of supply on an inter-State invoice. Also among the six essentials. Fix: corrected invoice.

5. A bill of supply where a tax invoice was required. A bill of supply carries no tax and is not a prescribed credit document under Rule 36. Fix: the supplier issues a tax invoice; where the supply was wrongly treated as exempt, s.76 may also be engaged. Collecting tax you should not have →

6. Not reported by the supplier. Section 16(2)(aa) requires the details to have been furnished in the statement of outward supplies and communicated to the recipient. An invoice absent from GSTR-2B fails regardless of its quality. Fix: the supplier reports it in GSTR-1, and the credit becomes available in the period it appears.

The six curable or harmless defects

7. Wrong or missing HSN. Not among the six essentials. The credit stands. The supplier has a Rule 46(g) contravention and a GSTR-1 Table 12 problem, but the recipient's credit is intact. HSN digit requirements →

8. Defective serial number. More than sixteen characters, a disallowed symbol, a gap in the series. A supplier compliance issue, not a credit issue — though where e-invoicing applies, a non-compliant number will have failed IRN generation, which returns you to defect 1.

9. No signature. Rule 46(q). Not among the six essentials. And Rule 46 proviso dispenses with the signature where the invoice is issued in accordance with the Information Technology Act, 2000 — which covers digitally signed and e-invoiced documents.

10. Wrong address. Where the GSTIN is correct, the address is descriptive. It matters for the place of supply analysis and for s.16(2)(b) delivery evidence, but not as a documentary defect.

11. Imprecise description. The proviso requires a description of goods or services, not a precise one. A generic description weakens the classification position but does not defeat the credit.

12. Tax charged under the wrong head. CGST plus SGST where IGST was due, or the reverse. This is the interesting one.

The wrong-head case

Where a supply treated as intra-State is later held inter-State, or vice versa, s.77 of the CGST Act and s.19 of the IGST Act apply.

Section 77(1): a registered person who has paid central tax and State tax on a transaction considered by him to be an intra-State supply, but which is subsequently held to be an inter-State supply, shall be refunded the amount of taxes so paid, in the manner and subject to the conditions prescribed.

Section 77(2): such a person shall not be required to pay any interest on the amount of integrated tax payable.

Rule 89(1A) gives the mechanism, with the two-year period running from the date of payment of the tax under the correct head.

For the recipient, the position is that credit of the wrongly charged tax is not available, because that tax was not payable on that supply. The correct tax must be charged and the wrong tax refunded to the supplier.

Practically, the supplier issues a credit note for the wrong-head invoice and a fresh invoice under the correct head — which is cleaner than a s.77 refund and puts the recipient's credit right. Section 77 is the remedy where the error is discovered too late for that.

The practical triage

On receiving a defective invoice:

1. Is there an IRN, where one is required? If not, stop and get a fresh invoice.
2. Is the recipient GSTIN correct? If not, get it corrected — it is in someone else's 2B.
3. Are the six essentials present? Tax amount, description, total value, both GSTINs, place of supply for inter-State. If yes, the credit stands.
4. Is it in GSTR-2B? If not, chase the supplier's GSTR-1.
5. Everything else — record the defect, tell the supplier, and take the credit.

Key takeaways

• Six fatal defects: no IRN, wrong recipient GSTIN, no tax amount, no inter-State place of supply, a bill of supply, and non-reporting by the supplier.
• Six curable: HSN, serial number, signature, address, description, and the wrong tax head.
• The proviso to Rule 36(2) rescues an invoice missing anything outside the six essentials.
• No IRN cannot be cured by anything, because there is no invoice.
• Wrong head is corrected by a credit note and a fresh invoice, with s.77 as the fallback.
• Section 77(2) confirms no interest on the correct-head tax.

Read next

• Rule 36: Which Documents Support a Credit Claim
• Rule 46: Every Particular a Tax Invoice Must Carry
• Rule 48(5): An Invoice Without an IRN Is Not an Invoice
• Section 77 CGST Act: Tax Wrongfully Collected and Paid

Disclaimer: Positions stated as on 5 September 2026, based on the CGST Act and Rules as amended to 31 March 2026 (ICAI Bare Law, 12th edition) and the ICAI Handbook on Invoicing under GST (2025).