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A GST-registered business in India may be able to claim a refund when eligible input tax credit (ITC) accumulates because the tax rate on its inputs is higher than the rate on its taxable output supplies. The rate mismatch alone does not guarantee a refund: the credit must be eligible and unutilised, the product and claim period must not fall under an applicable restriction, and the claim is capped by the Rule 89(5) formula.
What an inverted-duty refund is—and what it is not
In an inverted duty structure, the tax rate on relevant inputs is higher than the tax rate on the taxable output supplies made using those inputs. Because output tax may be insufficient to absorb the available eligible ITC, credit can remain unutilised. Section 54(3) of the CGST Act, 2017 provides for a refund in qualifying cases, subject to statutory conditions and notified restrictions.
This is not a general refund of every balance in a business’s electronic credit ledger. You need to establish that the accumulation arose from the rate inversion, calculate the amount allowed under the applicable formula, and check whether a restriction applies to the goods and period involved. A positive result from a preliminary calculation is a potential claim—not a promise that the officer will sanction it.
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- Fix the claim period and proposed filing date. These determine which version of the Rule 89(5) formula applies. The formula amendment applies prospectively to applications filed on or after 5 July 2022; applications filed earlier are dealt with under the earlier formula.
- Identify the relevant taxable output supplies. List the supplies for which you believe the rate inversion caused credit to accumulate. Confirm the applicable output tax rate for the claim period rather than relying on a current rate or an informal product description.
- Check the inputs and their rates. Identify the inputs connected with the relevant supplies and confirm their tax rates for the same period. The refund test concerns the relationship between input and output rates; a low output-tax payment by itself does not demonstrate an inverted duty structure.
- Reconcile eligible ITC for the relevant period. Establish the input tax credit availed during that period and identify amounts for which a refund is claimed under Rule 89(4A), Rule 89(4B), or both. Those amounts are excluded from Net ITC in the Rule 89(5) calculation.
- Check product classification against notified restrictions. Match the actual product’s classification and the claim period to the exact applicable notification entry. Chapters 15 and 27 have specified restrictions described below; their chapter headings alone do not establish that every product in either chapter is barred.
- Calculate the statutory cap and compare it with the proposed claim. Use the formula version applicable to the filing date and the required period-specific turnover and credit figures. The result is a maximum amount under the formula, not necessarily the amount payable after scrutiny.
- Prepare to file and respond to scrutiny. Use the electronic GST refund process and prescribed forms, retain the underlying calculations and records, and monitor the application for an acknowledgement or any notice from the proper officer.
How to calculate the maximum refund under Rule 89(5)
Under the current Rule 89(5) text, the maximum refund amount for inverted-rated supplies is calculated as follows:
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Maximum Refund Amount = (Turnover of inverted-rated supply of goods and services × Net ITC ÷ Adjusted Total Turnover) − tax payable on such inverted-rated supply of goods and services
The formula allocates Net ITC in proportion to the turnover of the inverted-rated supplies, then subtracts the tax payable on those supplies. It is therefore not a claim for the entire electronic credit ledger balance, and the calculation can produce a lower amount than the credit balance you hoped to recover.
Understand each input to the formula
- Turnover of inverted-rated supply of goods and services: the turnover figure for the relevant inverted-rated supplies used in the calculation. Identify and support the supplies included; do not substitute total business turnover for this figure without checking the rule’s definitions.
- Net ITC: ITC availed on inputs during the relevant period, excluding ITC for which a refund is claimed under Rule 89(4A), Rule 89(4B), or both. It is not simply every type of credit available to the business.
- Adjusted Total Turnover: the denominator specified in Rule 89(5). Use the definition in the applicable full rule text and the figures for the claim period; do not replace it with an internal sales total that has not been reconciled to the rule.
- Tax payable on the inverted-rated supplies: the tax amount to subtract for those supplies under the rule. Use the actual period-specific supply and tax data used to support the claim.
- Relevant period: the period for which the refund application is filed. The Net ITC inputs must relate to that period.
Before relying on a calculation, reconcile the figures to the business’s period records and the applicable Rule 89(5) definitions. The CBIC rules provide the governing formula and definitions; the variables cannot safely be populated from a general ledger total without confirming that each figure represents the prescribed amount.
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Which formula applies: the filing date is decisive
CBIC Circular 181/13/2022-GST, dated 10 November 2022, explains the prospective operation of the Rule 89(5) amendment. It states: “The said amendment is not clarificatory in nature and is applicable prospectively with effect from 05.07.2022.” In practical terms, the amended formula applies to refund applications filed on or after 5 July 2022. An application filed before that date is dealt with using the formula as it stood before the amendment.
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Do not choose the formula only by looking at when the relevant purchases or sales occurred. For this amendment, CBIC’s circular specifically distinguishes applications by their filing date. If a claim period spans dates on either side of the change, or if a claim has been revised or refiled, check the rule and circular against the actual application history before deciding which formula to use.
| Application filing date | Formula treatment described by CBIC | What to verify |
|---|---|---|
| Before 5 July 2022 | Use the Rule 89(5) formula as it existed before the amendment. | Confirm the original filing date and consult the then-applicable rule text. |
| On or after 5 July 2022 | Use the amended Rule 89(5) formula. | Confirm the filing date and use the current applicable definitions and formula text. |
Check whether the goods are covered by a restriction
Notification 09/2022-Central Tax (Rate), effective 18 July 2022, specifies goods falling under Chapters 15 and 27 for which refund of unutilised ITC is not allowed when the accumulation results from input tax rates exceeding output tax rates. CBIC Circular 181/13/2022-GST describes this restriction as prospective.
This is a product-classification check, not a rule that every good in either chapter is automatically excluded. A chapter number or broad commercial name is not enough to decide whether your particular product appears in the notification schedule. Check the exact tariff classification, the notification entry, and whether the restriction applies to the claim period. If classification is uncertain, resolve that issue before treating the refund as available or barred.
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Build a supportable calculation from your records
There is no single universal supporting-document checklist established for every inverted-duty claim in the official materials described here. The live portal requirements and the facts of a claim can vary. Instead of assuming that a generic list is complete, prepare records that allow you to explain each eligibility decision and reproduce the formula.
- Period and filing history: record the claim period and the intended application date, and retain evidence of any earlier application if the claim has been submitted before. This determines the formula version.
- Product and rate mapping: map the relevant inputs and taxable output supplies to their product classifications and the tax rates applied during the period. Retain the basis used for classification and rate treatment.
- ITC reconciliation: reconcile ITC availed on inputs for the relevant period to the amount used as Net ITC. Separately identify credit associated with a refund claim under Rule 89(4A) or Rule 89(4B), because it is excluded from Net ITC for this formula.
- Turnover and tax figures: retain the period-specific data used for turnover of inverted-rated supplies, Adjusted Total Turnover, and tax payable on the relevant supplies. Ensure that the numbers match the definitions in the applicable rule text.
- Restriction review: document the product classification and the notification entry checked, especially where the goods may fall under Chapters 15 or 27 or the supply involves a concessional notification.
- Calculation trail: preserve the formula version, inputs, arithmetic, and reconciliation so that the amount claimed can be traced back to the underlying records.
These are practical records needed to substantiate the logic and figures of a claim, not a representation that every item is a prescribed upload or that the list covers every portal requirement. Review the current GST portal application and the applicable rules for the forms and supporting information required for your filing.
File electronically and track the officer’s decision
The refund process is electronic and uses prescribed forms. Under the refund rules, after an application is found complete, an acknowledgement is issued in FORM GST RFD-02. If the proper officer considers the claim inadmissible or not payable, the rules provide for a notice in FORM GST RFD-08 and a reply in FORM GST RFD-09 within the stated period, followed by a reasoned decision. The rules also provide that an application should not be rejected without a reasonable opportunity of being heard.
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- Check for the acknowledgement. An acknowledgement in FORM GST RFD-02 indicates that the application has been found complete for this stage. Keep it with the filed application and calculation records.
- Monitor for an officer notice. If a proposed rejection is issued in FORM GST RFD-08, read the reasons against the rule, formula, classification, and supporting figures actually used in the claim.
- Reply within the stated period. Use FORM GST RFD-09 to address the issues raised and provide relevant explanations or support. Do not assume the original filing alone answers a specific objection.
- Review the reasoned decision. Keep the officer’s decision and related correspondence with the claim file. The statutory calculation is a cap and eligibility framework; the application remains subject to scrutiny.
Common reasons a preliminary “yes” may not hold
The business has unused ITC, but no demonstrated rate inversion
An unused balance does not by itself prove entitlement under this refund category. The relevant case is accumulation because the input tax rate is higher than the output tax rate on the relevant taxable supplies. Document the rate comparison and connect it to the credit that accumulated.
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The calculation uses the whole ledger balance as Net ITC
Rule 89(5) defines Net ITC for this calculation as ITC availed on inputs during the relevant period, with specified exclusions for claims under Rules 89(4A) and 89(4B). Reconcile the claim to that definition rather than copying the ledger closing balance into the formula.
The filing date and formula version do not match
Applying the amended formula to an application filed before 5 July 2022—or using the older formula for a later filing—can change the calculation. Verify the actual filing date before finalising the claim amount.
A chapter-level label is treated as a complete classification decision
The restriction described for Chapters 15 and 27 applies to specified goods, not necessarily every product in those chapters. Confirm the exact classification against the notification schedule instead of deciding from a broad description.
A concessional supply is treated as settled without checking its treatment
Where goods are supplied under a concessional notification, the relevant CBIC clarification and notification may matter. The circular index entry alone is not a product-specific determination, so examine the actual notification and transaction details.
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The cap is mistaken for an approved refund
A formula result establishes only the maximum amount under Rule 89(5), using the figures and definitions entered. Completeness, eligibility, notified restrictions, and officer scrutiny still affect whether any amount is sanctioned.
Make the decision for your business
Treat the claim as a “potentially eligible” case only when you can establish all of the following: the relevant taxable output supplies have a lower tax rate than the relevant inputs; eligible ITC remains unutilised because of that inversion; the claim period and filing date point to the correct formula version; the relevant product classifications do not place the goods within an applicable restriction; and the formula produces a claimable amount from reconciled period figures.
If any one of those checks is unresolved—particularly tariff classification, a Chapters 15 or 27 notification entry, or concessional-notification treatment—do not infer the answer from a broad product label or a portal balance. Confirm the current statutory text and notifications for the period and transaction before filing. The official framework described here is based on CBIC materials accessed on 9 October 2026; it does not determine eligibility for an unidentified business or replace checking current law and portal requirements when you apply.
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