The 5/12/18 Input Mix: A Worked Refund Example for Pharma Formulations

An illustrative Tier-1 integrated pharma formulator running a large Baddi plant in Himachal Pradesh closes October 2025 — the first full tax period under the 56th GST Council rate reset that took effect on 22 September 2025. The plant produces Chapter 30 medicaments — tablets, capsules, syrups, small-volume injectables — at approximately Rs 55 crore of monthly outward supply value, all now at 5 percent GST. The input base is structurally rate-mixed at the classic pharma 5/12/18 profile: active pharmaceutical ingredients at 5 percent under HSN Chapter 29 heading 2941 (antibiotics as APIs) and Chapter 30 heading 3003 (bulk drug mixtures); glass vials for the injectable line at 18 percent under HSN 7010; printed cartons and mono-cartons at 12 percent under HSN 4819; excipients (starch, microcrystalline cellulose, dicalcium phosphate, magnesium stearate, lactose) at 5 percent under mixed HSN chapters. Industrial solvents — hexane, isopropyl alcohol, methanol, toluene, methyl ethyl ketone used in the API purification and wet-granulation steps — sit separately at 18 percent under HSN Chapter 27 and are held aside for the Notification 09/2022 carve-out treatment. This is the pharma inverted duty refund input mix 5 12 18 percent worked example at operating scale, and the reconciliation discipline that separates a defensible monthly Form GST RFD-01 filing from a deficiency-memo cycle is a line-by-line input register that decomposes Net ITC by input HSN chapter, carves out the Chapter 27 solvent line on the conservative treatment, and correctly excludes input-services and capital-goods ITC from the numerator per Notification 14/2022.

Quick reference

The reconciliation in one paragraph

A Chapter 30 formulator producing tablets, capsules, syrups and small-volume parenterals sells at 5 percent GST post the 22 September 2025 rate reset. Its input base carries the 5/12/18 rate signature — APIs at 5 percent under HSN Chapter 29 or Chapter 30 heading 3003, glass vials at 18 percent under HSN 7010, printed cartons at 12 percent under HSN 4819, and excipients at 5 percent (or 12 percent for a small subset) under mixed HSN Chapters 12 to 35. The weighted average input rate sits materially above 5 percent, so every tax period locks unutilised input tax credit into the electronic credit ledger. Section 54(3) of the CGST Act 2017 permits refund of that unutilised credit; Rule 89(5) of the CGST Rules 2017, as amended by Notification 14/2022-Central Tax dated 5 July 2022, gives the formula. Net ITC in the numerator excludes input services and capital goods — a position codified by the amendment and previously confirmed by the Supreme Court in Union of India v. VKC Footsteps. Notification 09/2022-Central Tax (Rate) dated 13 July 2022 bars refund where output supplies fall under HSN Chapter 15 or Chapter 27; the reconciliation surface for a Chapter 30 formulator is the Chapter 27 solvent input leg, which is held as a distinct disclosure line and, on the conservative treatment illustrated in this worked example, excluded from the Net ITC pool. The refund is filed monthly in Form GST RFD-01 per state GSTIN with a Statement 1A invoice-level annexure.

What the scenario looks like in India — the illustrative Baddi plant persona

Baddi in Himachal Pradesh anchors a large slice of national formulation capacity. The plants sited there in the 2005 to 2010 window were built to capture the erstwhile area-based excise exemption for units in specified hill states, and most of that capacity has continued in operation under the standing GST regime with the plant footprint intact and the production lines re-purposed for the Chapter 30 formulation mix that the Indian majors currently supply into the domestic acute and chronic therapy market. Sikkim carries a similar concentration of formulation capacity that traces to the Section 80-IE income-tax deduction for units in the north-eastern and hill states. The Gujarat Ahmedabad-Vadodara-Halol corridor, the Telangana Hyderabad-Bachupally-Bollaram belt, Maharashtra’s Kurkumbh, Ankleshwar in Gujarat and Verna in Goa complete the geographic footprint of the industry.

Illustrative Tier-1 and Tier-2 pharma formulators operating multi-plant Chapter 30 output networks at the scale relevant to this worked example include Sun Pharmaceutical Industries, Dr Reddy’s Laboratories, Cipla, Aurobindo Pharma, Lupin, Zydus Lifesciences, Torrent Pharmaceuticals, Alkem Laboratories, Glenmark Pharmaceuticals and Cadila Pharmaceuticals in the Tier-1 band; Biocon Biologics, Piramal Pharma, Ipca Laboratories, Ajanta Pharma, Natco Pharma, Laurus Labs, Granules India, Strides Pharma Science and JB Chemicals in the Tier-2 speciality and complex-generics band. Divi’s Laboratories and Neuland Laboratories skew to Chapter 29 API output rather than Chapter 30 formulation — their inversion cycle runs against a different rate arithmetic that the API-versus-formulation HSN reference guide unpacks.

The persona this worked example builds against is a Tier-1 formulator’s Baddi plant with approximately Rs 55 crore of monthly Chapter 30 outward supply value, sitting in the smaller end of the multi-plant network that a Tier-1 integrated formulator typically operates. The plant produces a mix of oral solid dosage forms (tablets and capsules under HSN 3004) and small-volume parenterals (injectables under HSN 3004 filled in glass vials under HSN 7010). The finance team’s monthly Rule 89(5) refund cycle for this plant runs against the plant’s Himachal Pradesh state GSTIN; the aggregate three-plant network reconciliation (Ahmedabad in Gujarat, Baddi in Himachal Pradesh, Sikkim) sits under three parallel state GSTINs, each with its own Form GST RFD-01 filing, as walked in the Wave 1 Rule 89(5) formulations cornerstone.

The regulatory overlay — Section 54(3), amended Rule 89(5), Notification 09/2022, and the 56th GST Council reset

Section 54(3) of the Central Goods and Services Tax Act 2017 permits a registered person to claim refund of unutilised input tax credit where the credit has accumulated on account of the rate of tax on inputs being higher than the rate of tax on output supplies — the inverted duty structure. The first proviso empowers the government to notify supplies against which refund of unutilised ITC shall not be allowed. The Supreme Court in Union of India v. VKC Footsteps India Pvt Ltd (2021) 10 SCC 674 upheld the statutory scheme and confirmed that the refund is confined to unutilised credit on inputs; input services and capital goods stand excluded from the Net ITC base.

Rule 89(5) of the Central Goods and Services Tax Rules 2017 gives the operational formula. Notification 14/2022-Central Tax dated 5 July 2022 amended the rule prospectively — refund applications filed on or after 5 July 2022 apply the amended formula. The amended formula reads: Maximum Refund Amount = (Turnover of inverted-rated supply of goods and services × Net ITC / Adjusted Total Turnover) minus (Tax payable on such inverted-rated supply × Net ITC / ITC availed on inputs and input services). Net ITC is expressly defined as the input tax credit availed on inputs, excluding input services and capital goods. The Wave B sibling on the Notification 14/2022 amendment unpacks the mechanics of the two-limb formula and the interaction of the second-limb ratio with the input-services ITC composition.

Notification 09/2022-Central Tax (Rate) dated 13 July 2022, effective 18 July 2022, invokes clause (ii) of the first proviso to Section 54(3) and bars Section 54(3) refund where output supplies fall under HSN Chapter 15 (animal or vegetable fats and edible oils) or HSN Chapter 27 (mineral fuels, mineral oils, products of distillation — the chapter that houses hexane, isopropyl alcohol, methanol, toluene and methyl ethyl ketone). The Wave B sibling on the Notification 09/2022 solvent block walks the input-side carve-out treatment that a Chapter 30 formulator applies on the conservative reading illustrated in this worked example. The parallel Agro-cluster walkthrough on edible oil Chapter 15 refund blocked under Notification 09/2022 covers the direct output-side block for the Chapter 15 edible-oil manufacturer — the same statutory mechanic, applied at a different HSN chapter.

The 56th GST Council meeting held on 3 September 2025, with recommendations effective 22 September 2025, is the reason inversion deepened for the Chapter 30 formulator. The rate reset moved all Chapter 30 formulations to a flat 5 percent, moved medical devices under HSN 9018 to 9022 from 18 percent to 5 percent, and moved a specified schedule of life-saving drugs for cancer, HIV, tuberculosis and rare diseases to nil rate. The Council’s own FAQ set (Q10, Q25, Q51) acknowledged the deepened inversion for Chapter 30 formulators and pledged expedited processing of Section 54(3) refunds under the Rule 89(5) framework, as read in the 56th GST Council pharma transition walkthrough.

A worked example — line-by-line input register and refund quantum

Illustrative — the following figures represent the operating pattern of a Tier-1 pharma formulator’s Baddi plant at the scale that Indian large-cap listed formulators operate. Public disclosures do not reveal per-plant per-month inverted-duty refund quantum in the granularity below; cross-verify against your own plant’s GSTR-1 and GSTR-2B extracts before action.

The Baddi plant closes October 2025 with the following outward and inward supply position for the tax period, in Rs crore:

Outward supply (Chapter 30 formulations)

Inward supply — the 5/12/18 input mix

Net ITC composition and Rule 89(5) computation

The Net ITC that feeds the Rule 89(5) numerator is Rs 3.54 crore — the sum of the four eligible-input legs. The Chapter 27 solvent ITC of Rs 1.80 crore is held aside on the conservative Notification 09/2022 carve-out treatment (the plant discloses it as a distinct line in Statement 1A but excludes it from the Net ITC pool for the refund claim). The input-services ITC of Rs 1.44 crore and the capital-goods ITC of Rs 0.96 crore are excluded per the Notification 14/2022 amendment codification of Net ITC, though both remain fully availed as ordinary ITC in the electronic credit ledger against future output-tax liability.

Applying the amended Rule 89(5) formula:

• Turnover of inverted-rated supply of goods = Rs 55.0 crore
• Net ITC = Rs 3.54 crore
• Adjusted Total Turnover = Rs 55.0 crore (all outward supply is Chapter 30 inverted-rated)
• Tax payable on the inverted-rated supply = Rs 2.75 crore
• First limb: (55.0 × 3.54 / 55.0) = Rs 3.54 crore
• Second limb (simplified where the ITC-on-inputs-and-input-services ratio approaches unity for illustrative clarity): Rs 2.75 crore
• Maximum refund = 3.54 − 2.75 = Rs 0.79 crore per month

The illustrative maximum refund quantum of approximately Rs 0.79 crore per month for the Baddi plant flows straight into the Form GST RFD-01 draft against the plant’s Himachal Pradesh state GSTIN. The Statement 1A invoice-level annexure carries the four eligible-input legs at line-item granularity and discloses the Chapter 27 solvent leg as a distinct row so the officer’s scrutiny surface is transparent. The provisional refund of up to 90 percent is granted in Form GST RFD-04 within seven days of application filing; the final sanction follows in Form GST RFD-06 after scrutiny. In the multi-plant network view, this Baddi computation is one of three parallel monthly Form GST RFD-01 filings that the finance team runs — the Ahmedabad and Sikkim plants file their own claims under their respective state GSTINs, with the Wave 1 aggregate three-plant walkthrough covering the network-level position in operating detail.

Common reconciliation breakages

Five breakages recur across Indian Chapter 30 formulators running the 5/12/18 input-mix worked example at monthly cadence, and each maps to a specific control failure that a deficiency memo in Form GST RFD-03 will surface.

• HSN sub-classification drift on the printed carton and glass vial legs. The 12 percent printed carton rate applies to HSN 4819. The 18 percent glass vial rate applies to HSN 7010. Vendor invoices that carry a wrong 4-digit HSN — printed cartons mis-classified into HSN 4823 (other paper articles at 18 percent), glass vials mis-classified into HSN 7020 (other glass articles) — feed the input register with the wrong rate tag, producing an under- or over-stated ITC in the Net ITC composition. Reconciliation discipline: the input register cross-checks vendor-invoice HSN against the master HSN table for the standard input SKUs and flags any drift for vendor confirmation before the tax period closes.

• Chapter 27 solvent carve-out inconsistency across tax periods. A plant that includes the Chapter 27 solvent leg in Net ITC in one tax period and excludes it in the next (or vice versa) triggers a proper officer challenge on the composition consistency at scrutiny. The defensible posture is to apply the same treatment consistently across tax periods, and to hold both the base-case (solvent included) and defence-case (solvent excluded) computations in the workbook so a future policy change can be applied prospectively with a full audit trail.

• Input-services ITC bleed into the Net ITC numerator. The most common cause of a partial refund rejection is inclusion of input-services ITC — freight on inbound API and packaging, external analytical laboratory services, engineering consulting, plant maintenance contracts — in the Net ITC base. The exclusion was codified in Notification 14/2022 and settled at the Supreme Court in VKC Footsteps. Formulators that treat the entire GSTR-2B ITC pool as Net ITC without separating input-service line items produce an over-stated refund claim that the proper officer rejects with a deficiency memo. Reconciliation discipline: the input-services ledger is extracted from GSTR-2B at source and held in a separate accounting bucket. The GSTR-2B ITC reconciliation failure-mode reference walks the goods-versus-services split in operating detail.

• Capital-goods ITC bleed into Net ITC. Similar failure mode with a different attack vector — capital-goods ITC on reactors, granulators, compression machines, blister packaging lines, HVAC additions and cold-chain infrastructure is not eligible for Section 54(3) inverted-duty refund and does not enter Net ITC. The standing refund mechanism for capital-goods ITC sits under separate provisions, not Rule 89(5). Formulators that include capital-goods ITC in the numerator produce a rejection at scrutiny and a partial reversal against the electronic credit ledger.

• Adjusted Total Turnover base miscount on a mixed-portfolio plant. Adjusted Total Turnover in the Rule 89(5) denominator excludes turnover from supplies for which refund is claimed under other subsections of Section 54 and excludes exempt turnover. A plant with a mixed portfolio — including nil-rated life-saving drugs under the 22 September 2025 schedule, or export supplies claiming refund under Section 54(1) with Letter of Undertaking — that folds the entire aggregate turnover into Adjusted Total Turnover mis-scales the ratio and produces an incorrect maximum refund quantum. Reconciliation discipline: the Adjusted Total Turnover base is built as an explicit register keyed to supply type (inverted-rated, exempt, nil-rated, zero-rated with LUT, zero-rated with tax payment), and only the correct legs feed the Rule 89(5) denominator.

The methodology framework for building the per-plant per-tax-period reconciliation workbook — mapping each input HSN chapter to a distinct reconciliation surface and holding both base-case and defence-case computations — sits in Terra Insight’s own reconciliation failure mode analysis pillar and the reconciliation playbook for monthly close operations pillar. The parallel Agro-cluster walkthrough on the dairy inverted-duty refund under Rule 89(5) illustrates the same input-mix decomposition mechanic applied to a different rate arithmetic (5 percent packaged milk output against 18 percent packaging input).

How a reconciliation platform handles this

A purpose-built pharma reconciliation platform ingests the plant-level GSTR-1 outward supply register, the GSTR-2B auto-populated ITC statement, and the plant’s own accounting input register — and produces a Rule 89(5) refund workbook per plant per tax period that decomposes Net ITC by input HSN chapter into the 5/12/18 legs, separates the input-services and capital-goods ledgers from the goods-input Net ITC base, holds the Chapter 27 solvent leg as a distinct disclosure line with both base-case and defence-case computations, applies the amended Notification 14/2022 formula, generates the Statement 1A invoice-level annexure, and drafts the Form GST RFD-01 filing base for portal submission. Match rate improvement of 51 to 88 percent on the plant-level GSTR-2B to accounting ITC reconciliation, combined with an ISO 27001:2022 posture and DPDP Act 2023 aligned data handling, is what makes the platform an infrastructure investment for a Tier-1 pharma formulator running a multi-plant Chapter 30 network — read the pharma reconciliation software India product surface and the broader reconciliation software India authority for the platform overview. The pharma inverted-duty refund Rule 89(5) calculator provides a self-serve entry to the input-mix computation illustrated in this walkthrough.

The five FAQs below address the operational questions Indian pharma indirect-tax leads and formulation-plant controllers ask most often when building the 5/12/18 input-mix reconciliation into the standing monthly Rule 89(5) refund cycle.

Terra Insight Editorial Team Reconciliation Infrastructure

Content authored by practitioners with experience at Amazon India, Intuit QuickBooks, and the Tata Group. Meet the team →

Published 15 July 2026

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Navin Krishnan

Managing Director & Founder — Terra Insight

Ex Amazon India · Intuit QuickBooks · Tata nexarc

ISO 27001:2022 Patent Pending Incorporated 2024