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Indian auto-component suppliers running non-ferrous RMPV claims against OEM contracts that name LME as the reference must convert USD-per-MT settlement prices to delivered INR-per-kg through four layers (LME settlement + LBMA FX + Mumbai aluminium premium + GST at consumption), reconcile cash-vs-3-month ambiguity, hold the alloy premium and the landed premium fixed, and time the Ind AS 37 provision against LME's first-business-day-of-following-month finalisation.
Anchor on the LME cash settlement (or 3-month forward, contract-specified) for the revision period at the contractual averaging method. Convert through LBMA-published or contract-specified INR FX. Apply the fixed-at-award Mumbai aluminium premium for delivered-base. Apply the fixed-at-award alloy premium (A356 over LME-primary, OFE copper over LME copper). Compute: Claim = (LME_INR_per_kg_Current − LME_INR_per_kg_Base) × Material_Weight × Quantity. Book Ind AS 37 provision at quarter-end; true up on LME finalisation. Route upward to supplementary invoice, downward to Section 34 credit note within cutoff.
Part master row per non-ferrous-content part carrying LME metal (aluminium / copper / nickel / lead / zinc), reference type (cash / 3-month forward), averaging method, FX rule, landed premium fixed at award, alloy premium fixed at award, base LME-INR-per-kg level. LME feed by daily settlement. LBMA FX feed. Quantity-supplied feed by revision period per OEM. Quarter-end provision ledger. GST routing splitting upward vs downward with Section 34 cutoff watch.
Per-claim worksheet showing LME reference type and metal, base and current LME-USD-per-MT values, FX applied, landed premium fixed, alloy premium fixed, derived LME-INR-per-kg differential, rupee claim, GST routing (supplementary invoice or Section 34 credit note), Ind AS 37 provision-vs-actual true-up, Section 34 cutoff watch flag, and recorded FX/premium fixings for audit defence.
LME is where the world prices non-ferrous metals. For Indian auto-component suppliers, that means anything aluminium (A356 castings, wire-rod aluminium for HVAC tubing) and anything copper (wiring harness, ignition coils, motor windings, busbars). The contractual RMPV clause names LME; the operational reality is that the supplier must walk LME-USD-per-MT through four conversion layers to land at a delivered-INR-per-kg base that the part master can use.
This is the operator’s guide to using the LME aluminium copper RMPV auto component India workflow correctly — what LME publishes, how to convert it, how to reconcile cash vs 3-month settlement, the Mumbai aluminium premium layer, and a fully-worked monthly aluminium claim for an HVAC condenser supplier to Daikin’s Indian OEM customer. For the steel side, see the JPC steel price index companion. For the formula-only treatment, the RMPV calculation formula piece.
Quick reference
| Element | What it is | Source |
|---|---|---|
| Publisher | London Metal Exchange | https://www.lme.com |
| Frequency | Daily cash settlement; monthly average finalised first business day of following month | LME calendar |
| Metals covered for auto | Aluminium (A356 castings), copper (harness, coils), zinc (galvanising), nickel (stainless trim), lead (batteries) | LME-listed contracts |
| Currency / unit | USD per metric tonne | LME official quote |
| Conversion to INR/kg | LME × LBMA FX × (1 + landed premium) ÷ 1,000 | Mumbai aluminium premium fixed at award |
| Typical reference | LME cash settlement, monthly average | Contract-specified; 3-month forward in some long-cycle programmes |
| GST on RMPV | Upward: supplementary invoice; Downward: Section 34 credit note | CGST Act |
What LME publishes
The London Metal Exchange operates physical-settlement futures contracts for primary non-ferrous metals. Daily settlements include:
- Cash settlement — the spot price, settled in 2 business days. The most-referenced LME quote.
- 3-month forward — the most-quoted forward, used for hedging and longer-cycle contracts.
- Longer forwards out to 27 months and beyond — used by smelters and major end-users.
LME also publishes daily official settlements at the morning ring and the afternoon ring. Most contracts reference the official settlement; some reference the unofficial closing price. Contract language matters.
For auto-component RMPV, the most common references are LME aluminium cash, monthly average and LME copper cash, monthly average. The monthly average is the arithmetic mean of the daily official cash settlements across the calendar month, finalised on the first business day of the following month.
The four-layer USD-to-INR conversion
Auto-component RMPV requires landing at INR per kilogram. The conversion runs in four layers:
Layer 1: LME settlement in USD/MT. Example — LME aluminium cash monthly average for the revision period: $2,180/MT.
Layer 2: LBMA-published or contract-specified INR FX. Most contracts use either (a) the LBMA-fix rupee rate averaged across the same period as the LME monthly average, or (b) the RBI reference rate averaged across the same period, or (c) a contract-locked rate. The supplier and OEM must use the same rule on both sides of the trade. Example — INR 83.50/USD applied: $2,180 × 83.50 = ₹1,82,030/MT.
Layer 3: Mumbai aluminium premium (landed premium). Physical aluminium delivered to a Mumbai or Chennai foundry trades at a premium over LME-warehouse aluminium. This is the Mumbai aluminium premium — published periodically by ALEM and similar trade journals. The premium covers shipping, port handling, customs clearance, and the basis between LME-warehouse and Mumbai-port-arrival. Typical range is 4–6% (roughly $80–$200/MT historically). The premium is fixed at programme award and held outside the RMPV mechanism — only the LME differential flows. Example — premium fixed at 5%: ₹1,82,030 × 1.05 = ₹1,91,132/MT = ₹191.13/kg.
Layer 4: GST at point of consumption. Not embedded in the RMPV base. GST applies at the component’s applicable rate when the part is invoiced.
For copper, the same four-layer flow applies with the Mumbai copper premium (typically tighter, 2–4%) and the OFE (oxygen-free electronic) alloy premium for harness-grade copper held fixed at award.
Why A356 dominates the casting consumption
A356 (LM25 in older UK nomenclature) is an aluminium-silicon-magnesium casting alloy — 7% silicon, 0.3% magnesium. It is the workhorse grade for Indian auto-component foundries:
- Engine blocks and cylinder heads — Sundaram-Clayton, Brakes India for castings into Tata, Ashok Leyland
- Wheel hubs and brake calipers — Endurance, Rico Auto into Bajaj, Hero MotoCorp
- HVAC condenser headers and tubing — Sansera, MAXX for Subros, Sanden, Denso India
- Transmission casings — Sundaram-Clayton, Brakes India
A356 prices off LME primary aluminium plus a fixed alloy premium covering the silicon and magnesium dosing and the casting-grade certification. The alloy premium is locked at programme award and held fixed across the agreement life.
The RMPV mechanism therefore only flows the LME-differential portion — the A356 premium does not move with LME.
Why cash vs 3-month settlement matters
Cash settlement tracks physical-market reality closely; 3-month forward embeds hedging cost and a longer commitment view. The trade-off:
- Cash, monthly average — appropriate for short-cycle automotive supply (weekly schedule releases, JIT delivery). Volatility hits the supplier and OEM in real time. Most common in Tier-1 auto.
- 3-month forward — appropriate for longer-commitment contracts (heavy-castings programmes with multi-month tooling lead times). Smooths volatility but lags physical market.
- Arbitrage risk — if the supplier applies cash and the OEM applies 3-month forward (or vice versa), claims diverge meaningfully on each cycle. Always document explicitly.
Worked example — monthly LME-based aluminium claim for an HVAC condenser supplier
A Tier-1 HVAC component supplier ships condenser assemblies to Subros (which in turn supplies Maruti). The supplier’s plant is in Manesar; deliveries are JIT to the Subros line.
Programme details:
- Material: A356 aluminium for the condenser header casting
- Reference: LME aluminium cash, monthly average
- Conversion: LME × LBMA monthly average INR/USD × (1 + 5% Mumbai premium fixed at award)
- Material_Weight per part: 0.85 kg of A356 (the condenser header casting; aluminium tubing for the coil is separate and tracked under wire-rod aluminium)
- Base LME-INR/kg: $2,250/MT × INR 82.40 × 1.05 ÷ 1,000 = ₹194.69/kg (programme award, three years ago)
- Alloy premium A356 over LME-primary: fixed at award, not flowed through RMPV
- Trigger band: 1.5%
- Adjustment_Factor: 1.0
Q1 revision period (April–June):
- LME aluminium cash monthly averages: April $2,170/MT, May $2,180/MT, June $2,195/MT
- LBMA INR/USD monthly averages: April 83.45, May 83.50, June 83.55
- Period-average LME × FX: ((2170×83.45)+(2180×83.50)+(2195×83.55))/3 = ₹182,150/MT (computed period-averaged)
- With 5% Mumbai premium: ₹182,150 × 1.05 = ₹191,258/MT = ₹191.26/kg
Quantity supplied Q1: 76,000 condenser headers
Step-by-step:
- Raw differential = ₹191.26 − ₹194.69 = −₹3.43/kg (LME has fallen vs base)
- Trigger-band absorbed = 1.5% × ₹194.69 = ₹2.92/kg (symmetric trigger absorbs first 1.5% in either direction)
- Net differential after trigger = −₹3.43 + ₹2.92 = −₹0.51/kg (downward claim only on the excess)
- Per-part claim = −₹0.51 × 0.85 = −₹0.43/part
- Total Q1 claim = −₹0.43 × 76,000 = −₹32,936
- Direction: negative (downward revision) → Section 34 credit note
- Credit note raised 18 July through Maruti e-Nagare (Subros acts as pass-through Tier-1, Maruti reimburses); GST reduction follows
- Section 34 cutoff: 30 November of the following financial year — well within window
Ind AS 37 provision at 30 June:
- April and May LME monthly averages and FX known
- June estimated from daily LME cash observations
- Estimated provision: −₹31,200 (recognised as a liability — downward revision = decrease in receivable)
True-up on 1 July when June LME monthly average finalises:
- Actual: −₹32,936
- Provision: −₹31,200
- Adverse true-up: −₹1,736 booked to current quarter
Compute LME-anchored RMPV claims across your non-ferrous part book
Walk every aluminium and copper part through LME cash or 3-month forward, FX conversion, Mumbai premium, and trigger band to size the supplementary-invoice or Section 34 credit-note position per OEM per cycle.
Open the RMPV Calculator →Copper for harness and coils
Copper RMPV is structurally identical to aluminium, with two differences:
- Mumbai copper premium runs tighter than the aluminium premium — typically 2–4%.
- OFE (oxygen-free electronic) copper for harness is the dominant grade for wiring; OFE premium over LME-primary is held fixed at award.
Major Indian harness suppliers (Motherson Sumi, Yazaki India, Lear, Aptiv India) ship copper-content harnesses into Maruti, Hyundai, Tata, M&M with copper-content RMPV that flows the LME-copper monthly average through the same four-layer conversion. A typical mid-segment passenger-car harness carries 18–28 kg of copper; a 5% LME-copper move on 1,00,000 units per quarter is a meaningful claim.
GST and TDS treatment
GST is unchanged by the Income Tax Act 2025. LME-based upward claims raise supplementary (debit) invoices in the current GSTR-1 period; downward claims raise Section 34 credit notes within the 30 November cutoff.
TDS under the Income Tax Act 2025: the material-portion RMPV claim is not subject to TDS — it is a revision to a goods supply. The conversion portion of the next regular payment attracts Section 393(1)(k) at 2% under payment code 1012, replacing the retired 194Q. See the TDS payment codes 1001–1092 reference and the Section 393 master guide.
FX gain or loss on the LME-USD-to-INR conversion is held inside the RMPV claim (it flows through the differential), not separately reported as an FX P&L line under Ind AS 21.
What automated reconciliation changes
A spreadsheet-driven LME-based RMPV loses on the four-layer conversion documentation, the Mumbai-premium-fixed audit trail, the cash-vs-3-month consistency, and the Section 34 cutoff watch on downward claims. Purpose-built auto-component reconciliation software India carries the LME metal, reference type, FX rule, landed premium, and alloy premium per part, ingests the LME daily feed and LBMA FX, applies the contractual averaging method and trigger band, books the Ind AS 37 provision at quarter-end, trues up on LME finalisation, splits upward vs downward into supplementary invoice vs Section 34 credit note, watches the cutoff, and preserves the full audit trail per claim. TransactIG ships 24+ industry presets including the auto-component RMPV preset with non-ferrous extensions. Customer outcomes include match-rate improvement from 51% to 88%. Build is two-to-four weeks on AWS Mumbai (ISO 27001:2022). For the Tier-2 procurement equivalent see three-way matching software India.
Continue reading in the automotive-components cluster
- RMPV calculation formula for auto-component suppliers — operator-level claim walkthrough
- JPC steel price index for RMPV claims — steel-side companion
- Automotive component manufacturing reconciliation in India — sub-pillar