Inverted Duty Refund Calculator — Rule 89(5) GST Refund of Unutilised ITC for FY 2025-26

How to Use the Inverted Duty Refund Calculator

The calculator mirrors the computational logic that the proper officer applies when scrutinising your Form RFD-01 with Statement-1A. Each field maps to a specific row of the GSTR-1 / GSTR-3B return for the period or to the electronic credit ledger. Following the step-by-step workflow below ensures inputs match the official Statement-1A preparation methodology.

1. Tax period and filer type — Select the month for which IDS refund is being computed and whether you file monthly GSTR-3B or under the QRMP scheme. Filer type drives the GSTR-3B due date which is the relevant date for the two-year limitation under Section 54(1).
2. Turnover of inverted rated supply — Pull from Table 4(B) of GSTR-1 (taxable outward) for the period, restricted to invoices where output rate is lower than input rate. Exclude nil-rated, fully exempt and notified-restricted supplies.
3. Adjusted Total Turnover — Sum of all taxable outward supplies including zero-rated, less exempt supplies other than zero-rated. Pull from Table 3.1 of GSTR-3B with required adjustments.
4. Net ITC (Input Goods Only) — From Table 4(A)(5) of GSTR-3B, subtract Table 4(B)(1) and 4(B)(2) reversals; further exclude ITC on capital goods and input services. This is the denominator for the formula.
5. ITC on Input Services — Required for the new formula's deduction term. Input services include manufacturing services, job work, freight, insurance, professional services etc. attracting ITC.
6. Tax Payable on Inverted Rated Supply — Output IGST/CGST/SGST liability on inverted rated supplies only, before adjusting any ITC. Computed as inverted turnover × output rate.
7. Restricted-goods status — Toggle whether your output goods fall under the restricted list. Chapter 15 and 27 restriction applies only to tax periods from 18 July 2022 onwards.
8. Application date — Date of filing RFD-01 — used to compute the 60-day final order window and Section 56 interest entitlement.

Section 54(3)(ii) — When IDS Refund Arises

The statutory foundation for inverted duty refund is the second proviso to Section 54(3) of the CGST Act, 2017. Sub-section (3) generally restricts refund of unutilised ITC, with two exceptions: zero-rated supplies under proviso (i), and inverted duty structure under proviso (ii). The latter reads: "where the credit has accumulated on account of rate of tax on inputs being higher than the rate of tax on output supplies (other than nil rated or fully exempt supplies)". The mechanism prevents working capital blockage in genuinely inverted supply chains while excluding cases where the rate inversion arises from taxpayer-chosen output exemption.

Industries Where IDS Commonly Arises

• Textiles and apparel — Manmade yarn at 12% inputs vs woven fabric / garments at 5% output. Largest historic IDS sector by refund volume.
• Footwear — Soles, leather and synthetic inputs at 12-18% vs finished footwear at 5% (below ₹1,000) or 18% (above).
• Fertilisers — Phosphoric acid, ammonia and other inputs at 18% vs urea/DAP/MOP at 5% output.
• EV batteries and EV parts — Battery inputs at 18% vs supply to EV manufacturer at 5% (in some segments).
• Pharmaceuticals — Active Pharmaceutical Ingredients at 18% vs life-saving drugs and select formulations at 5%.
• Tractors and farm equipment — Steel, components at 18% vs tractor at 12% output.
• Renewable energy equipment — Solar cells, panels and BoS components.
• Job work in inverted-rate sectors — Where output service rate is lower than the rate on input goods consumed in job work.

Categories Excluded from IDS Refund

Section 54(3) and Rule 89(5) read together exclude certain supplies from IDS refund eligibility:

• Nil-rated supplies and fully exempt supplies — Statutory exclusion in clause (ii) itself.
• Specified goods notified under Notification 5/2017-CT(R) as amended — certain fabrics and textile items (textile fabrics now eligible from 1 August 2018 per Notification 20/2018).
• Goods under Chapter 15 (edible oils) and Chapter 27 (mineral fuels, coal, lignite) per Notification 9/2022-CT(R) effective 18 July 2022.
• Rate-cut accumulation on the same goods (Circular 173/05/2022) — only same-point rate inversions qualify.
• Goods exported on payment of IGST — already covered under Rule 96; no double benefit.

Rule 89(5) Formula — Old, New and Worked Examples

Sub-rule (5) of Rule 89 of the CGST Rules prescribes a specific formula for computing the maximum refund of unutilised ITC under inverted duty structure. The formula has evolved through three iterations over the GST regime — the original 2017 version, the retrospective amendment by Notification 21/2018 / 26/2018 applying from 1 July 2017 to restrict Net ITC to input goods only, and the proportionate-deduction amendment by Notification 14/2022 effective 5 July 2022. The current formula is the third iteration.

Current Formula (post 5 July 2022)

Pre-Amendment Formula (before 5 July 2022)

Key Definitions

Net ITC means Input Tax Credit availed on inputs (goods) during the relevant period. Per Notification 26/2018-CT (retrospective from 1 July 2017) and the Supreme Court in Union of India v VKC Footsteps India Pvt Ltd (2021), Net ITC excludes ITC on input services, ITC on capital goods, blocked credits under Section 17(5) and ITC reversed under Rules 42/43.

Turnover of Inverted Rated Supply means the value of taxable outward supplies on which the rate of tax on inputs (goods) is higher than the rate on the output supply, during the relevant period. Excludes nil-rated, exempt and notified-restricted supplies.

Adjusted Total Turnover means the sum of value of all taxable supplies (excluding zero-rated supplies turnover under Rule 89(4)(D)) plus value of zero-rated supplies, less value of exempt supplies other than zero-rated, during the relevant period.

Tax Payable on Inverted Rated Supply means the output GST liability on the inverted rated supplies for the period — IGST plus CGST plus SGST on the inverted-supply turnover, before adjusting any ITC.

Why the New Formula Matters

The pre-2022 formula deducted the full output tax payable on inverted rated supply from the formula amount. Where input service ITC was a significant portion of total ITC, the deduction often wiped out the entire formula amount, leaving zero refundable balance even where genuine accumulated credit existed. The 47th GST Council recommended a proportionate deduction calibrated to the share of input goods in total ITC. The new deduction term reads: tax payable × (Net ITC / Total ITC including input services). Where input services contribute say 30% of total ITC, the deduction is reduced by 30% — restoring fairness.

VKC Footsteps Decision & Input-Service ITC Exclusion

The most consequential judicial pronouncement on inverted duty refund is the Supreme Court decision in Union of India v VKC Footsteps India Pvt Ltd delivered on 13 September 2021 by a bench of Justice D Y Chandrachud and Justice M R Shah. The case reconciled conflicting High Court views on whether ITC on input services qualifies for IDS refund. The Court upheld Rule 89(5) and the restrictive definition of Net ITC.

Background of the Conflicting Views

The Gujarat High Court in VKC Footsteps at the writ stage held that Explanation (a) to Rule 89(5) — which defined Net ITC to mean ITC on inputs only and excluded input services — was ultra vires Section 54(3) of the CGST Act. The reasoning: Section 54(3) speaks of refund of unutilised ITC without restricting it to input goods, so Rule 89(5) cannot narrow the statutory entitlement. The Madras High Court in Tvl. Transtonnelstroy Afcons Joint Venture v UOI reached the opposite conclusion, holding that the Rule was intra vires and the statutory framework permits Parliament to differentiate between input goods and input services.

The Supreme Court's Reasoning

The Supreme Court resolved the conflict in favour of the Madras view. Three key holdings:

1. Refund is a creature of statute — There is no inherent fundamental right to refund of unutilised ITC. The legislature has the discretion to circumscribe the refund mechanism within Section 54.
2. Input goods and input services are not equally placed — The CGST Act recognises a structural distinction between the two; differential refund treatment does not violate Article 14.
3. The formula in Rule 89(5) read with Explanation (a) is intra vires — The exclusion of input service ITC from Net ITC is consistent with Section 54(3)(ii) which does not mandate that all unutilised ITC must be refunded.

However, the Supreme Court flagged that the formula did create anomalies in practice and urged the GST Council to revisit the computation. This urging was acted upon by the 47th GST Council meeting which led to the Notification 14/2022 amendment described above. The new formula partially mitigates the input-service exclusion through the proportionate deduction term but does not fully restore input-service ITC refundability.

Practical Implications Today

• Input services ITC is not directly refundable as IDS refund.
• Capital goods ITC is not refundable at all under Rule 89(5).
• Net ITC for the formula numerator is strictly input goods only.
• Total ITC including input services is used in the denominator of the new formula's deduction term.
• Service-intensive manufacturers with significant marketplace commission, freight, professional fees etc. should still expect material accumulated ITC even after IDS refund.

Restricted Goods — Notification 5/2017 & Notification 9/2022

Section 54(3) read with the second proviso empowers the Government to notify supplies on which IDS refund will not be allowed. Two key restriction notifications operate today, with overlapping coverage.

Notification 5/2017-Central Tax (Rate) — Textile Sector

Issued on 28 June 2017 alongside the original GST notifications, Notification 5/2017-CT(R) listed certain woven and knitted fabrics, made-ups and certain textile items as goods on which IDS refund would not be allowed. The restriction was widely criticised by the textile industry which faced significant working capital strain. Following industry representation, Notification 20/2018-CT(R) dated 26 July 2018 amended the list — IDS refund was allowed for fabrics with effect from 1 August 2018, subject to the condition that ITC accumulated up to 31 July 2018 on such fabrics shall lapse.

Notification 9/2022-Central Tax (Rate) — Edible Oils & Mineral Fuels

Issued on 13 July 2022 and effective from 18 July 2022, Notification 9/2022-CT(R) inserted Entry No. 12B into the restricted list, covering specified goods of:

• Chapter 15 — Animal/vegetable fats and oils including palm oil, soyabean oil, sunflower oil, coconut oil, groundnut oil and their refined variants. The 5% output rate vs 18% input chemicals creates inversion.
• Chapter 27 — Mineral fuels, mineral oils and products of their distillation including coal, lignite, coke, briquettes and bituminous substances. Output at 5% vs 18% inputs.

Edible oil and coal manufacturers had been availing substantial IDS refunds; the notification stopped fresh refund for periods from 18 July 2022 onwards. Refund applications for tax periods prior to 18 July 2022 remained eligible, irrespective of when the application was filed.

Prospective Application Confirmed by Gujarat HC (2025)

CBIC Circular 181/13/2022-GST had attempted to apply the restriction to all applications filed after 18 July 2022, even for prior tax periods. The Gujarat High Court in July 2025 struck down para 2(2) of Circular 181 as ultra vires the parent notification and Section 54. The Court held that the restriction operates on the tax period — not the date of filing — and a refund claim for a period prior to 18 July 2022 cannot be denied merely because the application was filed thereafter, provided the two-year limitation under Section 54(1) is met.

Rate Cuts vs Concessional Rates — Circular 173/05/2022

One of the most litigated questions in IDS refund is whether rate inversion arising from a tax-rate reduction on the same goods qualifies for refund. CBIC's evolving stance and ultimate clarification in Circular 173/05/2022-GST dated 6 July 2022 settles the position.

The Two Scenarios

Scenario A — Concessional notification at the same point in time: Inputs of fertiliser at 18% supplied to a fertiliser manufacturer whose output urea attracts 5% by virtue of a concessional rate notification. Both rates exist concurrently. IDS refund is admissible.

Scenario B — Rate cut on the same goods over time: Inputs of garments procured at 12% prior to a rate reduction; subsequent garment supply at 5% post the rate-cut notification. The same goods now attract a lower output rate due to a temporal rate change. IDS refund is not admissible — the accumulation arose from a rate cut, not from a structurally inverted supply chain.

Judicial Endorsement

The Telangana High Court in Micro Systems & Services Sole Proprietorship v UOI (2022) considered Circular 173/05/2022 to be clarificatory and applied it retrospectively to rate-cut inversions. Earlier High Court decisions including the Calcutta HC in Shivaco Associates v Joint Commissioner of State Tax (2022) and the Rajasthan HC in Baker Hughes Asia Pacific Ltd (2022) had distinguished concessional-rate inversion from rate-cut inversion and allowed refund only in the concessional-rate scenario. The position is now settled.

How to Test Your Case

1. Identify the input HSN and the output HSN.
2. Pull the rate notification applicable to inputs and the rate notification applicable to outputs on the same date.
3. If both rates are concurrent and the input rate is higher, IDS refund is admissible.
4. If the inversion arose because the output rate was reduced via a subsequent notification while inputs continued at a higher rate, refund is not admissible to the extent of pre-rate-cut accumulated credit.
5. For mixed scenarios (some inversion structural, some from rate cut), apportion the accumulated ITC and claim only the structurally inverted portion.

Recent Rulings — Ascent Meditech, Filatex & Tirth Agro

The legal landscape on Rule 89(5) has shifted significantly in favour of taxpayers through 2024 and 2025. Three rulings stand out.

Ascent Meditech Ltd v Union of India (Gujarat HC 2024)

The petitioner challenged CBIC Circular 181/2022 paragraph 2(1) which made the new Rule 89(5) formula prospective from 5 July 2022, thereby denying the proportionate-deduction benefit to taxpayers with refund claims for earlier periods filed before 5 July 2022. The Gujarat High Court held that the amendment to Rule 89(5) was curative and clarificatory in nature and therefore applies retrospectively. The Court reasoned that the amendment merely corrected an anomaly in the original formula identified by the Supreme Court in VKC Footsteps and gave effect to the legislative intent of refunding unutilised ITC. The contrary portion of Circular 181 was quashed.

Filatex India Ltd v Union of India (Gujarat HC 2025)

Building on Ascent Meditech, the Gujarat High Court reaffirmed in Filatex India that the new formula applies retrospectively. The Court emphasised that procedural amendments to refund computations do not create new rights or impose new restrictions — they merely give better effect to the existing entitlement under Section 54(3)(ii). The Department was directed to recompute past refund applications using the new formula.

Union of India v Tirth Agro Technology Pvt Ltd (Supreme Court 2025)

The Department filed a Special Leave Petition before the Supreme Court challenging the Gujarat HC view in a related Tirth Agro Technology matter. In July 2025 the Supreme Court dismissed the SLP through a non-speaking order. While a non-speaking dismissal is not a binding precedent under Article 141 (per the Constitution Bench in Kunhayammed v State of Kerala), the dismissal effectively allowed the Gujarat HC view to stand and emboldened other taxpayers to claim retrospective benefit. Several High Courts including the Bombay, Delhi and Kerala HCs are expected to follow the Gujarat reasoning in pending matters.

Implications for Past Periods

• Refund claims filed before 5 July 2022 and pending — Apply for recomputation under the new formula citing Ascent Meditech and Filatex.
• Refund claims rejected on the old formula and under appeal — Move appellate authority for restoration based on the curative-and-retrospective doctrine.
• Periods prior to 5 July 2022 not yet claimed but within limitation — File RFD-01 using the new formula directly.
• Past closed claims with finality — Generally no relief available; consider rectification under Section 161 only in narrow scenarios.

RFD-01 Filing Process & Statement-1A Preparation

Inverted duty refund is filed through Form GST RFD-01 on the GST common portal under category "Refund on account of ITC accumulated due to inverted tax structure". The filing journey, from data preparation to refund credit, typically spans 60 to 90 days for clean cases.

Pre-Filing Documentation

• HSN-wise rate analysis proving structural inversion at same point in time.
• GSTR-1 and GSTR-3B for the period(s) covered, filed on or before the RFD-01 application.
• Annexure-B with invoice-wise ITC details for inputs (excluding services and capital goods).
• Statement-1A computing the maximum refund amount per Rule 89(5) with formula breakdown.
• Electronic credit ledger statement for the period showing accumulated ITC balance.
• Undertaking under Rule 89(2)(l) that the refund will not be passed on to others.
• Declaration of non-prosecution under Rule 89(2)(k).
• CA / CMA Certification in Annexure 2 of Circular 125/2019 if refund exceeds two lakh rupees.
• Bank account details validated and registered on the GST portal.

Filing Steps on GST Portal

1. Login to gst.gov.in and navigate to Services → Refunds → Application for Refund.
2. Select "Refund on account of ITC accumulated due to inverted tax structure".
3. Choose the financial year and the period(s) (consecutive periods within same FY may be clubbed).
4. Auto-populate the eligible Net ITC from Table 4(A)(5) of GSTR-3B less reversals.
5. Enter Statement-1A figures: Inverted Turnover, Adjusted Total Turnover, Tax Payable on Inverted Supply.
6. System computes Maximum Refund Amount using the prescribed formula.
7. Adjust head-wise (IGST/CGST/SGST) within the credit ledger balance constraint.
8. Upload Annexure-B, CA Certificate (if applicable) and supporting documents.
9. Submit using DSC or EVC. ARN is generated.

Post-Filing Process

The proper officer issues Form GST RFD-02 acknowledging receipt within 15 days. Scrutiny may include additional documents requested via Form GST RFD-08 deficiency memo. The final order in Form GST RFD-06 is required within 60 days of complete application per Section 54(7). Refund credit is processed through PFMS to the registered bank account. Section 56 interest at 6% per annum accrues from day 61 till credit date if delayed beyond 60 days.

Common Mistakes to Avoid

• Including input services or capital goods ITC in Net ITC computation.
• Including exempt or nil-rated turnover in Adjusted Total Turnover.
• Computing tax payable as net of ITC (should be gross output tax on inverted supply).
• Filing past-period claims using the old formula post-Ascent Meditech ruling.
• Missing the two-year limitation from GSTR-3B due date for the period.
• Not reversing ITC under Rule 42/43 before computing Net ITC for refund.
• Filing for restricted Chapter 15/27 goods for periods after 18 July 2022.
• Mixing zero-rated and inverted-rate periods in a single RFD-01.

Frequently Asked Questions