Most Indian auto-component manufacturers carry 45–90 days of raw-material and finished-goods inventory. That capital sits idle while steel prices swing, scrap accumulates, and your cash-conversion cycle stretches. The diagnostic is simple: if your inventory turn ratio (COGS ÷ average inventory value) is below 4–5× annually, you are likely holding safety stock far beyond what OEM lead times demand.
This article walks you through the mechanics of inventory costing, how to identify the real cost of each day's stock, and the operational discipline that lets you cut 15–25% of inventory value without stockout risk.
Advisory
Inventory holding cost includes carrying cost (financing at 10–14% per annum, plus storage rent, insurance, and pilferage at 3–5%), plus obsolescence and shrinkage. A ₹100 lakh raw-material inventory on 60-day payment terms carries a real annual cost of ₹20–28 lakh. Most CFOs budget only financing cost and miss storage, scrap, and quality loss. If you are not calculating holding cost by SKU and storage location, you cannot see which inventory items destroy margin.
The mismatch between stated lead time and actual supplier performance creates excess buffer. Example: a tier-1 fastener supplier promises 21-day delivery; you hold 60-day safety stock because the last three orders shipped late. Audit your last 12 months of PO-to-receipt dates (use GRN date minus PO date from your ERP). If 95% of receipts fall within 28 days, but you stock for 60, you are holding 32 days of unnecessary buffer. That is ₹8–12 lakh per critical line item tied up on behalf of one supplier's past delays.
Run a Pareto on your finished-goods register: list every SKU, calculate annual turn (units sold ÷ average stock), and plot cumulative % of sales. You will find 10–15% of lines turning once a year or slower. These are usually custom variants, obsolete designs, or items built for forecasts that never materialised. At ₹50 lakh average inventory, 35% slow-movers = ₹17.5 lakh locked in low-velocity stock. Holding cost on that stock alone is ₹3.5–4.9 lakh per annum — margin you lose before a single unit ships.
Excess inventory masks supplier quality issues, delays problem-solving, and forces you to negotiate pricing concessions to move ageing stock. A 20% reduction in inventory value (say, ₹10 lakh freed) saves ₹2–2.8 lakh per annum in holding costs — cash that flows straight to operating margin. Vinayakam helps engineering components manufacturers build inventory-turn KPIs into monthly P&L dashboards, run SKU-level profitability analysis, and audit your safety-stock formula against actual OEM demand and supplier SLA performance. We connect inventory discipline to working-capital forecasting and help you model the cash release from a 6–8 week rebalancing programme.
Your action checklist
- Finance head: Extract last 24 months of COGS and month-end inventory balances (raw material, WIP, finished goods) from your general ledger. Calculate inventory-turn ratio = [annual COGS ÷ average inventory value]. Benchmark: target 4.5–5
Frequently asked questions
Inventory turn measures how many times stock is sold and replaced annually (COGS ÷ average inventory value). Safety stock is the buffer inventory held above forecasted demand to prevent stockouts—often excessive when actual OEM lead times are 4–6 weeks but safety stock assumes 12–14 weeks.
True holding cost runs 20–28% annually, including financing (10–14%), storage rent, insurance, pilferage (3–5%), obsolescence, and shrinkage—not just the 10% financing cost most CFOs budget.
Audit the last 12 months of PO-to-receipt dates using GRN data; if 95% of receipts arrive within 28 days but you stock for 60 days, cut safety stock by 32 days. Calculate holding cost by SKU and storage location to identify which items destroy margin, then focus reduction on slow movers (turn < 2× annually).