GST refund of tax paid under wrong head: Section 77 and Section 19 correction guide

A supplier in Maharashtra issues an invoice to a client with a billing address in Gujarat, but inadvertently enters Maharashtra as the place of supply in Form GSTR-1. CGST and SGST are paid in Form GSTR-3B. Months later, during an internal audit, buyer reconciliation, or department scrutiny, the mistake surfaces: the transaction was an inter-State supply requiring IGST.

Many accountants assume they can simply set off the figures in the next month, or face steep interest penalties under Section 50. The statute provides a specific, protected remedy for this exact situation.

Statutory provisions under Section 77 and Section 19

The legal framework for tax paid under the wrong head rests on two complementary sections:

• Section 77 of the CGST Act: Governs transactions considered by the taxpayer to be intra-State, but subsequently held to be inter-State. Sub-section (1) provides that the CGST and SGST/UTGST so paid shall be refunded. Sub-section (2) provides that where a taxpayer paid IGST on a transaction considered inter-State, but subsequently held to be intra-State, no interest shall be charged on the CGST and SGST payable.
• Section 19 of the IGST Act: Provides the mirror mechanism. Sub-section (1) sanctions the refund of integrated tax paid on a supply considered inter-State, but subsequently held to be intra-State. Sub-section (2) provides that where CGST and SGST were paid on an intra-State supply subsequently held to be inter-State, no interest shall be charged on the integrated tax payable.

Meaning of subsequently held under Circular No. 162/18/2021-GST

For several years, field formations argued that the phrase "subsequently held" required a formal adjudication order or demand from a tax officer. Taxpayers who discovered their own errors were routinely denied Section 77 refunds.

CBIC put this controversy to rest through CBIC Circular No. 162/18/2021-GST dated 25 September 2021. Paragraph 3.2 of the circular clarifies that "subsequently held" covers both situations:

1. Cases where the taxpayer discovers the error on their own during return review, internal audit, or buyer intimation.
2. Cases where the tax officer determines the correct nature of supply during scrutiny under Section 61, audit under Section 65, or adjudication proceedings.

In both situations, the taxpayer is entitled to claim refund of the wrong tax, provided they pay the tax under the correct head.

Two-year limitation period under Rule 89(1A)

Ordinarily, refund claims under Section 54(1) must be filed within two years from the "relevant date". For wrong tax payments, measuring two years from the original return filing date caused serious hardship when errors were uncovered years later during departmental audits.

To resolve this, the government issued Notification No. 35/2021-Central Tax dated 24 September 2021, inserting sub-rule (1A) into Rule 89 of the CGST Rules:

“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 through the common portal...” Rule 89(1A), Central Goods and Services Tax Rules, 2017

Under Rule 89(1A), the clock does not run from the original erroneous return. The two-year limitation period starts on the exact date you pay the tax under the correct head. If an invoice from July 2023 was misclassified, and you pay the correct tax on 15 October 2026, your deadline to file Form GST RFD-01 is 14 October 2028.

Worked example: intra-State to inter-State correction

Consider M/s Apex Engineering Works (Maharashtra), who issued an invoice for specialized machinery on 14 August 2024 to a buyer located in Gujarat. The accounts team inadvertently treated the supply as intra-State.

Apex Engineering discharges the correct IGST liability of ₹1,80,000 on 18 October 2026. Under Section 77(2), no interest is payable. Apex Engineering then files Form GST RFD-01 for a refund of ₹90,000 CGST and ₹90,000 SGST, with a filing deadline of 17 October 2028.

Step-by-step procedure to file refund in Form GST RFD-01

The refund application is completed online on the GST portal without visiting the tax office. Follow these checked portal steps:

1. Discharge tax under correct head: Pay the correct tax liability either through Form GST DRC-03 (selecting voluntary payment or section 77 correction) or in Table 3.1 of your current Form GSTR-3B return. Note the payment date and challan CIN or return ARN. If you need guidance on Form GST DRC-03, see our DRC-03 voluntary payment guide.
2. Navigate to refund application: Log in to the GST portal refund module. Go to Services → Refunds → Application for Refund.
3. Select refund category: In the list of refund types, choose Tax paid on an intra-State supply which is subsequently held to be inter-State supply and vice versa (change of POS).
4. Select tax period: Choose the tax period in which the tax was originally paid under the wrong head. Click Create Refund Application.
5. Prepare and upload Statement 6: Under Rule 89(2)(j) of the CGST Rules, you must upload Statement 6 in Excel or CSV format. Statement 6 requires document details, original tax paid (CGST, SGST, or IGST), original place of supply, correct tax subsequently paid, and new place of supply.
6. Enter refund amount: The portal validates Statement 6. Enter the refund amount claimed under the respective CGST, SGST, or IGST heads in the refund table.
7. Upload supporting documents: Attach copy of original invoice, amended invoice or debit note, proof of payment under the correct tax head, and a CA/CMA certificate under Rule 89(2)(m) if the refund claim exceeds ₹2,00,000 (or self-declaration of non-unjust enrichment under Rule 89(2)(l) if ₹2,00,000 or below).
8. File application: Select the authorized signatory, tick the declaration checkbox, and file using DSC or EVC. An Application Reference Number (ARN) is generated instantly in Form GST RFD-02.

Common pitfalls to avoid

• Paying interest voluntarily: Automated accounting software or junior tax officers often compute 18% interest from the original return due date. Cite Section 77(2) and Section 19(2) immediately. Paying interest in DRC-03 for a Section 77 correction is an irrecoverable loss of working capital.
• Missing the Statement 6 format: Do not use Statement 1 or Statement 7 (excess tax payment). The portal will reject Section 77 claims if not uploaded in Statement 6 format under Rule 89(2)(j). For businesses handling formula-based refund categories, compare our inverted duty structure refund guide.
• Filing before paying correct tax: You cannot file Form GST RFD-01 under Section 77 until after you have actually paid the tax under the correct head. The portal requires payment proof and dates in Statement 6.
• Confusing Section 77 with Form GST PMT-09: Form GST PMT-09 transfers unutilized cash balances between major and minor heads inside the electronic cash ledger. It cannot transfer tax that has already been debited from the cash or credit ledger in a filed GSTR-3B return. Outward tax debited in past returns requires Form GST RFD-01.

Related guides

• GST refund of unutilized ITC on zero-rated supplies without payment of tax: LUT formula and Rule 89(4)
• GSTR-9 Table 14: reporting differential tax paid in cash with Form DRC-03 reconciliation
• Export of services without payment of tax: LUT ITC refund guide
• GST notices after reconciliation: remaining tax risks and fixes

Frequently asked questions

Last checked: 18 October 2026. Sources: Section 77, CGST Act, Section 19, IGST Act, CBIC Circular No. 162/18/2021-GST, Notification No. 35/2021-Central Tax, GST Portal Refund Manual.