GST Refunds Under the Inverted Duty Structure

Businesses often accumulate input tax credit when the GST paid on raw materials exceeds the GST charged on finished goods. This situation can restrict working capital, particularly for manufacturers operating with low output tax rates. The GST refund under inverted duty provisions allow eligible taxpayers to claim a refund of unutilised input tax credit, subject to statutory conditions and prescribed calculations.

Section 54(3) of the Central Goods and Services Tax Act, 2017, provides the legal basis for such claims. Rule 89(5) of the CGST Rules, 2017, sets out the formula for calculating the maximum refund. However, not every accumulation of credit qualifies. Businesses must establish a genuine inverted rate structure, check applicable exclusions and maintain accurate tax records.

What Is an Inverted Duty Structure Under GST?

An inverted duty structure arises when the GST rate on input goods is higher than the GST rate applicable to the corresponding outward supplies. The business pays more GST on its purchases than it collects on its sales, resulting in an accumulation of input tax credit. For example, a manufacturer may purchase raw materials attracting GST at 18% and sell finished products attracting GST at 5%. If the manufacturer cannot fully utilise the accumulated credit against its output tax liability, eligible unutilised credit may qualify for a refund. The important point is the difference in tax rates, rather than simply the amount of credit accumulated. A surplus caused by low sales, business losses or other commercial circumstances does not automatically qualify under the inverted duty provisions.

Legal Framework for GST Refund Under Inverted Duty

Section 54(3) of the CGST Act permits a refund of unutilised input tax credit in specified circumstances, including where credit accumulates because the tax rate on inputs is higher than the rate on outward supplies. The provision is subject to restrictions and exceptions prescribed by law. Rule 89(5) explains how the refund amount is calculated. Section 54 also establishes the broader refund framework, including application requirements and the limitation period. In Union of India v. VKC Footsteps India Pvt. Ltd., decided by the Supreme Court on 13 September 2021, the Court upheld the validity of Rule 89(5), including the exclusion of input service credit from the definition of Net ITC under the rule as then applicable. The judgment remains important when assessing refund eligibility and the scope of the statutory formula. The Supreme Court judgment explains the legal reasoning behind this treatment.

Which Businesses Can Claim an Inverted Duty Refund?

Manufacturers and other eligible registered taxpayers may claim a refund where the prescribed conditions are satisfied. The claim must relate to an inverted rate structure involving input goods and outward supplies. Businesses should first confirm the GST rates applicable to their inputs and final products. They should then determine whether the accumulated credit is attributable to the rate difference and whether the outward supplies fall within a category for which refunds are permitted.

A refund is generally unavailable where the accumulation arises solely because input services attract a higher rate than outward supplies. The same applies where the outward supply is nil rated or fully exempt, subject to the precise statutory provisions. Certain notified goods are also excluded from inverted duty refunds. Eligibility should therefore be assessed at the product and transaction level, rather than assumed for an entire industry.

GST Refund Formula Under Rule 89(5)

Rule 89(5) prescribes the maximum refund amount for eligible inverted duty claims. The formula, as applicable on 20 October 2026, is: Maximum Refund Amount = (Turnover of inverted rated supplies × Net ITC ÷ Adjusted Total Turnover) − [Tax payable on inverted rated supplies × (Net ITC ÷ ITC availed on inputs and input services)]

The calculation uses several defined terms. Turnover of inverted rated supplies refers to the relevant outward supplies covered by the claim. Net ITC generally means eligible input tax credit on input goods availed during the relevant period, excluding credit covered by specified alternative refund claims. Adjusted Total Turnover is determined under the applicable rules. The formula is a ceiling, not a guarantee of payment. The amount sanctioned depends on the correctly computed claim, eligibility conditions and verification by the tax authorities. Businesses should reconcile the formula with their returns and electronic credit ledger before submitting an application.

Is Input Service Credit Eligible for Refund?

Under the rules applicable on 20 October 2026, input tax credit on input services is excluded from Net ITC for calculating a refund under Rule 89(5). Credit on capital goods is also excluded from this calculation. Eligible input service credit may remain available for utilisation, subject to the normal input tax credit provisions, even though it does not form part of the inverted duty refund computation. A significant policy development was announced in October 2026. The Government's Press Information Bureau published FAQs on 9 October 2026 concerning GST Council recommendations to include eligible input service credit availed on or after 1 November 2026 in Net ITC for inverted duty refund calculations.

As of 20 October 2026, this should be treated as an announced recommendation with a future proposed effective date, rather than an assumption that the amended rule is already in force. Businesses filing claims around the transition should check the final notification and applicable rule wording. The official PIB announcement sets out the proposed change and its stated scope. The proposed reform does not remove the requirement to establish an inverted duty structure based on the tax rates on input goods and outward supplies.

Goods Excluded from Inverted Duty Refunds

Section 54(3) and the relevant notifications restrict refunds for specified categories. The restrictions have included certain goods falling under Chapters 15 and 27 of the Customs Tariff, subject to the precise descriptions and conditions in the applicable notification. Businesses should not rely only on a broad product description or industry classification. They should verify the tariff classification, relevant notification and any amendments applicable to the claim period. The CBIC has also issued clarifications on the operation of inverted duty refunds, including the amended formula and restrictions on specified goods. Its Circular No. 181/13/2022 GST explains important implementation issues. The circular also clarifies the prospective application of the amended formula introduced in July 2022.

How to Apply for a GST Refund Under Inverted Duty

Eligible taxpayers generally submit an electronic refund application in Form GST RFD 01 through the GST portal under Rule 89. The application should identify the relevant tax period and refund category and include the information and supporting documents required by the portal and applicable rules. Before filing, the taxpayer should reconcile outward supplies with GSTR 1 and GSTR 3B, verify eligible input credit, check the electronic credit ledger and calculate the refund under Rule 89(5). Any credit reversals, adjustments or overlapping claims should be reviewed carefully.

The applicant should retain purchase invoices, sales records, product classifications, rate notifications and a working paper showing the calculation. These records help demonstrate why the credit accumulated and how the amount claimed was derived. A refund application is ordinarily subject to a two year limitation period under Section 54, calculated from the relevant date prescribed for the particular refund category. Businesses should determine the applicable relevant date rather than assuming the period always runs from the end of the financial year. After filing, the department may issue an acknowledgement, deficiency memo or notice seeking clarification. A timely and properly documented response can help prevent avoidable delays or rejection.

Provisional Refunds and Processing of Claims

A key procedural development concerns provisional refunds. Under CBIC Instruction No. 06/2025 GST, the Government provided for provisional sanction of 90% of the claimed amount in eligible inverted duty structure refund applications filed on or after 1 October 2025, subject to the specified conditions and scrutiny safeguards. This is not an automatic entitlement for every applicant. Taxpayers must satisfy the applicable requirements, and cases involving specified risk indicators or procedural restrictions may require further examination before provisional payment. The final refund remains subject to verification. Businesses should therefore ensure the underlying claim is accurate even when provisional processing may be available.

Common Reasons for Refund Rejection or Delay

Refund claims may face difficulties where the taxpayer cannot establish the rate inversion, uses an incorrect formula, claims ineligible input service credit or fails to reconcile returns and credit ledger balances. Incorrect classification of inputs or finished goods can also undermine the claim. A difference between the GST rate assumed in the calculation and the rate legally applicable during the relevant period may lead to a reduced sanction or rejection.

Another common issue is overlooking product specific exclusions. Businesses should review the relevant notifications before filing and retain evidence supporting their interpretation. A clear calculation sheet, supported by transaction level records, makes it easier to answer departmental queries. Businesses seeking GST refund advisory for manufacturers should prioritise a review of eligibility, product classification, credit reconciliation and the limitation period before submitting a claim.

Challenging a Rejected GST Refund Claim

A taxpayer should first examine the refund order and identify the legal or factual basis for rejection. Disputes may concern the interpretation of Rule 89(5), classification of goods, the calculation of Net ITC, the application of a notified exclusion or the treatment of documents and returns. The appropriate remedy depends on the nature of the order and the applicable appeal provisions. Taxpayers should examine the limitation period, preserve the refund application and supporting records, and prepare a reasoned response addressing each finding. Where the dispute involves a substantial amount or an unsettled question of law, Tax lawyers for GST refund disputes can assist with analysing the order, evaluating appeal grounds and determining whether further legal remedies are available.

Conclusion

GST refunds under the inverted duty structure can help eligible businesses release working capital tied up in unutilised input tax credit. However, eligibility depends on the difference between input and output tax rates, the nature of the supplies, statutory exclusions and the formula under Rule 89(5). Businesses should maintain accurate records, reconcile credit balances, observe the limitation period and monitor legal changes affecting refund calculations. Careful preparation before filing can reduce avoidable disputes and improve the prospects of a timely, correctly assessed refund.

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