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Auto-component suppliers and OEMs disagree on the rupee amount due under index-linked RMPV clauses because the two sides use slightly different index series, different period definitions, or different rounding conventions, leaving cumulative settlement gaps over a quarter.
Reconstruct the contractual formula — base index, period index, weightage, applicable quantity — independently on both buyer and seller side, recompute the variation rupee value, and isolate disagreements to a specific formula input rather than the rupee output.
A part-number-level master that stores the contractual base index, the index source and series, the period definition, the quantity basis (dispatched, received, invoiced), and the rounding rule per OEM-supplier pair.
An RMPV credit or debit note backed by a transparent worksheet showing every formula input, the GST treatment under Section 34, and a clean link to the original supply invoices in the OEM's GSTR-2B.
Definition
RMPV — Raw Material Price Variation — is the contractual mechanism by which the price of an Indian auto-component is automatically adjusted to reflect movements in the underlying raw material commodity index between the date the price was originally agreed and the date the component was supplied. It is the dominant pricing model between OEMs and their Tier-1 component suppliers, and between Tier-1 and Tier-2 suppliers further down the chain.
In one sentence: RMPV is the index-linked top-up or refund that keeps a fixed component price honest when steel, aluminium, copper, or plastic resin moves.
Regulatory Reference
RMPV is a private contractual construct — there is no Indian statute named “RMPV”. However it sits inside two regulatory frames that govern how the resulting credit and debit notes are processed.
Section 34 of the CGST Act, 2017 governs credit notes (reducing the value of a supply) and debit notes (increasing the value of a supply) for any reason — including price variation. Section 34 prescribes the timing for issue (no later than 30 November of the following financial year for credit notes), the format, and the requirement that the recipient adjust ITC accordingly. RMPV settlement notes are credit and debit notes issued under this section.
The ACMA (Automotive Component Manufacturers Association of India) publishes member guidance on standard RMPV clauses, including index choice, period definition, and rounding conventions. Most large Indian OEMs — Maruti Suzuki, Tata Motors, Mahindra, Bajaj, Hero, TVS, Ashok Leyland — operate variants of the ACMA template adapted for their own commodity baskets.
Why It Matters
Three industries where RMPV reconciliation is operationally heavy:
Sheet-metal stamping and forging. Steel is 50 to 70 percent of the cost of a body-in-white stamping or a crankshaft forging. A ten percent move in HRC swings supplier margin from healthy to loss-making within a quarter. RMPV is the only mechanism that keeps these contracts viable.
Wiring harness and electrical. Copper prices are highly volatile and harness BOMs are copper-dominant. Tier-1 harness makers settle copper RMPV monthly with OEMs and pass on a separate monthly RMPV to copper-wire Tier-2s.
Plastic moulding and trim. Polypropylene, ABS, PVC, and engineering plastic resins all carry their own indices. A single bumper part number can carry a basket of three to four resin RMPVs depending on the BOM.
How to Spot It in Practice
Four signals an AR or AP analyst sees in the books:
- A separate document type — typically named RMPV-CN or RMPV-DN — issued monthly or quarterly, with a reference to the original invoices in the period.
- Part-number-level worksheets showing base index, period average index, applicable quantity, and the rupee variation per piece.
- Round-tripping in GSTR-1 and GSTR-2B — the supplier’s credit note in GSTR-1 must match the buyer’s debit-side adjustment in GSTR-2B.
- A clause reference on the document — typically “RMPV settlement for the quarter ended dd-mm-yyyy as per clause X of supply agreement dated dd-mm-yyyy”.
Common Misconceptions
- “RMPV is the same as a rate revision.” A rate revision changes the base price prospectively. RMPV is a formula-driven adjustment around a fixed base price.
- “Only the supplier issues RMPV notes.” Either side can. When the index moves down, the OEM is owed money and typically issues a debit note to the supplier; when it moves up, the supplier issues a credit note recovery.
- “RMPV does not attract GST.” It does. Both credit and debit notes carry tax under Section 34 of the CGST Act.
- “RMPV cancels out at year-end.” It does not cancel — each note creates an independent GST reporting obligation in the month of issue and must be reconciled against the original invoice for ITC eligibility.