Inventory Carrying Cost: Holding SGD 500K Stock Costs SGD 100K/Year Without Selling a Unit
Retailer: SGD 500K inventory on hand. Carrying cost: capital cost 4.5% (overdraft rate on SGD 500K) = SGD 22.5K/year. Warehouse rent SGD 5K/month = SGD 60K/year. Insurance 0.5% = SGD 2.5K/year. Shrinkage 1% = SGD 5K/year. Obsolescence risk 3% = SGD 15K/year. Total: SGD 105K/year = 21% of inventory value. Slow-moving SKUs (bottom 20% by turnover) = SGD 100K of inventory = costing SGD 21K/year to hold. Sell or liquidate = save SGD 21K.
- The Five Components of Inventory Carrying Cost
- Carrying Cost by SKU — Where the Drain Is
- Calculating Your Break-Even Liquidation Price
- AskBiz Carrying Cost Analytics
- The Mistake: Treating Carrying Cost as a Rounding Error
The Five Components of Inventory Carrying Cost#
(1) Capital cost: money tied up in stock could earn interest or repay debt. At 4.5% overdraft: SGD 500K inventory = SGD 22.5K/year opportunity cost. (2) Storage: warehouse rent, utilities, handling. (3) Insurance: stock insurance typically 0.3-0.8% of inventory value. (4) Shrinkage: theft, damage, counting errors — typically 0.5-2% of inventory. (5) Obsolescence: fashion/electronics risk going unsaleable — estimate 2-5%/year. Total: 18-28% of inventory value annually. Industry rule of thumb: 25%.
Carrying Cost by SKU — Where the Drain Is#
Aggregate carrying cost hides the real damage. A SKU sitting unsold for 12 months costs 25% of its purchase price to hold. Example: SKU X purchased SGD 10K, sat unsold 12 months = SGD 2.5K carrying cost. Sell for SGD 8K (20% markdown) = lose SGD 2K on sale, but save SGD 500 (net: -SGD 2K vs holding cost -SGD 2.5K — selling is still better). Beyond 12 months, holding cost exceeds markdown loss on most items.
Calculating Your Break-Even Liquidation Price#
If item cost SGD 100 and has been in stock 6 months (6/12 × 25% = 12.5% carrying cost = SGD 12.50 spent holding it): break-even liquidation price = SGD 100 cost − SGD 12.50 holding cost = SGD 87.50 (any price above SGD 87.50 is better than holding another 6 months). At 12 months: holding cost = SGD 25 → liquidation break-even = SGD 75. Sell >SGD 75 = better than holding. Reframe: markdown is not a loss, it is a carrying cost recovery.
AskBiz Carrying Cost Analytics#
Calculates carrying cost per SKU based on purchase cost, days in stock, and cost-of-capital rate. "Top 10 slowest SKUs: total inventory value SGD 85K, average 210 days in stock, estimated carrying cost SGD 12K annualised. Carrying cost per SKU ranges SGD 400 to SGD 2.8K. Recommendation: run clearance on 6 SKUs (>180 days): liquidation price ≥ SGD 62K recovers more than holding. Free up SGD 85K cash, save SGD 12K carrying cost. Net benefit: SGD 85K + SGD 12K vs potential markdown loss SGD 15K = net positive SGD 82K."
The Mistake: Treating Carrying Cost as a Rounding Error#
Most SMB owners price inventory decisions purely on purchase cost versus resale price and never factor in the cost of the shelf time in between — which is exactly backwards for any business holding stock more than a few weeks. Consider a Ho Chi Minh City homeware importer stocking SGD 300K of ceramics and furniture across 40 SKUs. The owner's mental model was simple: "I bought it for SGD 40, I sell it for SGD 70, that's a 43% margin, good deal." What the model missed is that 15 of those 40 SKUs sat in the warehouse for an average of 300 days before selling — at a 22% annual carrying cost, that is roughly 18% of purchase price consumed just holding the item, shrinking the real margin from 43% to about 25%. Worse, three SKUs had been sitting for over 500 days and were still being carried at full value on the books, masking a further SGD 9K of carrying cost nobody had accounted for. The mistake compounds because carrying cost is invisible on a standard P&L — it never shows up as a line item, it just shows up as slightly worse cash flow and slightly thinner margins that nobody can quite explain. Treat carrying cost as a real, ticking expense from day one of receiving stock, not an afterthought you calculate once a slow-mover embarrasses you at year-end. The fix the importer eventually applied was procedural rather than dramatic: every SKU now gets a carrying cost estimate attached at the point of purchase, calculated from expected days-to-sell based on that category's historical turnover, so the true expected margin is visible before the purchase order is even confirmed. Items where the carrying-cost-adjusted margin fell below 20% were either renegotiated on unit cost, ordered in smaller batches to reduce days in stock, or dropped from the catalogue entirely. Within two quarters, average days-in-stock across the 40 SKUs fell from 210 to 140, and blended real margin — after carrying cost — rose by six percentage points without a single price increase to customers, purely by buying smarter and turning stock faster.
Industry Carrying Cost Benchmarks and Where SMBs Typically Sit#
Carrying cost as a percentage of inventory value varies meaningfully by category, and knowing where your business type sits helps you judge whether your 21% is normal or a red flag. Fast-moving consumer goods and grocery typically run 12-18% (high turnover keeps capital and obsolescence costs low, but shrinkage from perishability pulls the number up). General retail and apparel sit at 20-28% (moderate turnover, meaningful obsolescence risk from seasonal and fashion cycles). Electronics and technology products often run 25-35% because obsolescence risk is severe — a smartphone accessory line loses relevance within a single product generation. Industrial parts and B2B spares can look deceptively low at 15-20% carrying cost, but only because turnover is slow by design (you are meant to hold safety stock) — the tradeoff there is capital cost, not obsolescence. A Singapore homeware retailer benchmarking themselves against the 20-25% general retail range and finding their carrying cost at 21% could reasonably conclude their inventory discipline is healthy; the same 21% at an electronics reseller would actually be below where it should be, suggesting they may be underestimating obsolescence risk on fast-moving tech categories rather than running an efficient operation.
People also ask
What is a good inventory carrying cost percentage?
Target: under 20% of average inventory value annually. Retail benchmark: 20-25%. If yours is above 25%, investigate storage efficiency (consolidate warehouse), reduce slow-moving stock (liquidate), and improve reorder accuracy (buy less, more often).
How do I reduce inventory without hurting service levels?
Use ABC analysis: A-items (fast-moving, high value) = always in stock. B-items = moderate buffer. C-items = order on demand or drop. Reducing C-item stock alone typically cuts inventory 15-25% with minimal service impact. Pair with faster supplier lead times (reduces safety stock needed).
Our team combines expertise in data analytics, SME strategy, and AI tools to produce practical guides that help founders and operators make better business decisions.
Calculate Carrying Cost by SKU (Find the Stock That Is Costing You Money)
AskBiz tracks days in stock, carrying cost rate, and liquidation break-even per SKU. Identifies the slow-movers draining cash. Try free.
Connects to Shopify, Xero, Amazon, QuickBooks, Stripe & more in minutes