Section 77 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.
A supply is treated as intra-State. Years later it is held to be inter-State. The tax was paid — just under the wrong heads — and now both a demand and a refund exist.
Section 77 and its IGST counterpart make that a clean correction rather than a double payment.
Section 77(1): a registered person who has paid central tax and State tax or Union territory 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. Section 77(2): such a person shall not be required to pay any interest on the amount of integrated tax payable. Section 19 of the IGST Act mirrors it for the reverse case.
The two directions
Section 77 CGST — paid CGST + SGST, held to be inter-State. Refund of CGST + SGST; pay IGST; no interest.
Section 19 IGST — paid IGST, held to be intra-State. Refund of IGST; pay CGST + SGST; no interest under s.19(2).
Both are symmetrical, and both turn on the same phrase: "considered by him" and "subsequently held".
"Subsequently held" — by whom
The section does not say. In practice it covers:
- a determination by the proper officer in a demand proceeding;
- an appellate or Tribunal order;
- a court judgment;
- an advance ruling binding on the applicant;
- and, on the better view, the taxpayer's own subsequent conclusion, acted upon by paying the correct tax.
The last is important. A taxpayer that identifies its own error, pays the correct head and claims refund of the wrong one should not be worse off than one that waits for a demand. Circular No. 162/18/2021-GST addressed the position and clarified that the refund is available where the taxpayer has paid the correct tax, whether or not the wrong-head payment was pursuant to any adjudication.
Rule 89(1A): the mechanism and the clock
Inserted specifically for s.77 claims:
"Any person, claiming refund under section 77 of the Act of any tax paid by him, in respect of a transaction considered by him to be an intra-State supply, which is subsequently held to be an inter-State supply, may, before the expiry of a period of two years from the date of payment of the tax on the inter-State supply, file an application electronically in FORM GST RFD-01... Provided that the said application may, as regards a refund of tax paid on a transaction before the date on which this sub-rule comes into force, be filed before the expiry of a period of two years from the date on which this sub-rule comes into force."
The clock runs from the date of payment of the tax under the correct head, not from the original wrong-head payment.
That is the taxpayer-friendly reading, and it is deliberate. A supply reclassified after five years would otherwise have a refund that was time-barred before the demand was even raised.
No interest, both ways
Section 77(2) and s.19(2) IGST: no interest on the correct-head tax.
The logic is that the Government held the money throughout. Only the head was wrong, and the exchequer as a whole was not deprived.
Two limits to note:
It covers only the head error. Where the tax was also short paid — a rate error alongside a head error — interest runs on the shortfall in the ordinary way under s.50.
It does not cover penalty. Section 77 addresses interest; a penalty proposal on the wrong-head payment is answered on its own terms, though a bona fide classification error is a poor candidate for the fraud limb.
The recipient's position
The recipient who took credit of the wrong-head tax has taken credit of a tax not payable on that supply.
Two approaches in practice:
Reverse and re-avail. The recipient reverses the CGST + SGST credit and takes the IGST credit on the supplier's fresh document, subject to s.16(4) on the new invoice or debit note's financial year.
Supplier issues a credit note and a fresh invoice. Cleaner, and it puts the recipient's credit right without a separate refund. But the s.34(2) limit applies to the credit note, so this route is unavailable once 30 November of the following year has passed. Credit and debit note particulars →
Where neither is possible, the recipient's credit is at risk and the commercial protection is contractual.
What section 77 does not cover
Tax paid on a supply that was not taxable at all. That is s.54(1) — refund of tax paid on any other amount — with unjust enrichment applying unless the claim fits s.54(8)(e). Section 54(8): unjust enrichment →
Tax collected but not payable. That is s.76, which requires the amount to be paid to the Government, taxable or not. Collecting tax you should not have →
A wrong rate. Not a head error. The excess is refundable under s.54(1) on the ordinary conditions.
Note also that s.54(8)(d) lists a refund in pursuance of s.77 as one of the six categories paid to the applicant rather than to the Consumer Welfare Fund — so unjust enrichment does not bar it.
Key takeaways
- s.77 CGST and s.19 IGST correct a head error in either direction.
- No interest on the correct-head tax.
- Rule 89(1A): two years from the date of payment of the correct tax, not the wrong one.
- Circular No. 162/18/2021-GST confirms the refund is available on the taxpayer's own correction.
- s.54(8)(d) pays it to the applicant, so unjust enrichment does not apply.
- The recipient's credit needs a credit note and fresh invoice, or a reverse-and-re-avail.
Read next
- Section 77 CGST Act: Tax Wrongfully Collected and Paid
- Section 54(8): Unjust Enrichment and the Exceptions
- The Relevant Date: Eleven Starting Points for Two Years
- Twelve Invoicing Errors That Cost the Recipient Credit
Need a hand with this claim? Our team handles the computation, RFD-01 filing and follow-up to sanction — see refund of excess tax paid.
Disclaimer: Positions stated as on 5 September 2026, based on the CGST and IGST Acts and Rules as amended to 31 March 2026 (ICAI Bare Law, 12th edition) and Circular No. 162/18/2021-GST.