Carrying cost (holding cost) is the total annual cost of keeping one dollar of inventory on your shelves — the sum of capital cost, storage, insurance, obsolescence, and shrinkage, expressed as a percentage of inventory value per year.
Quick answers
What is carrying cost? Carrying cost is the all-in annual expense of holding inventory. It includes the opportunity cost of capital, the physical cost of storage, insurance premiums, losses from spoilage or obsolescence, and shrinkage. For most SMBs, it runs 20–30% of average inventory value per year.
What is the carrying cost formula? carrying cost = average inventory value × carrying cost rate. The rate is the sum of its five components: capital cost + storage cost + insurance + obsolescence/spoilage + shrinkage. Each is expressed as a percentage of inventory value.
Why does carrying cost matter? Because it determines whether volume discounts actually save money, how much safety stock is economically justified, and what your optimal order quantity should be. It is the H in the Economic Order Quantity formula.
How does carrying cost relate to turns? Inventory Turnover and carrying cost are inversely related. Doubling your turns cuts your average inventory — and therefore your total carrying cost — roughly in half.
The formula
annual carrying cost ($) = average inventory value × carrying cost rate (%)
where the rate is composed of:
- Capital cost — the opportunity cost of cash tied up in inventory (8–15%). If your WACC is 12%, every dollar in inventory "costs" $0.12/year.
- Storage cost — rent, utilities, and labor allocated to inventory space (2–5%).
- Insurance — coverage on inventory assets (0.5–2%).
- Obsolescence/spoilage — value lost to expiration, damage, or items going out of season (2–10%).
- Shrinkage — theft, miscounts, administrative errors (1–3%).
Carrying cost by industry
| Industry | Typical range | Primary driver |
|---|---|---|
| Grocery / perishable | 30–40% | Spoilage |
| Restaurant / food service | 25–35% | Spoilage + storage |
| Specialty retail | 20–28% | Capital + obsolescence |
| Durable goods | 15–22% | Capital + storage |
| Electronics | 25–35% | Fast obsolescence |
Worked example
A specialty retailer carries $80,000 in average inventory. Their component rates:
- Capital cost: 10% (small-business line of credit at 10% APR)
- Storage: 4% (800 sq ft of a 2,000 sq ft space, $2,400/mo rent)
- Insurance: 1%
- Obsolescence: 5% (seasonal merchandise marked down)
- Shrinkage: 2%
Total carrying cost rate = 10 + 4 + 1 + 5 + 2 = 22%
Annual carrying cost = $80,000 × 0.22 = $17,600/year — or roughly $1,467/month just to hold what's on the shelves.
Now consider a "deal": a supplier offers 8% off on a $10,000 order if you double the quantity to $20,000. The discount saves $1,600. But the extra $10,000 sits for an additional 90 days, costing $10,000 × 22% × (90/365) = $542. Net benefit: $1,058 — still positive here. But if the rate were 35% (perishable goods), the cost would be $863, and the risk of spoilage makes the deal a coin flip.
Why most carrying cost estimates are wrong
Most operators either ignore carrying cost entirely ("storage is a fixed cost anyway") or undercount it by omitting capital cost. The result: order quantities are too large, slow movers linger for months, and cash is trapped on shelves instead of earning margin.
The most common errors:
- Excluding opportunity cost of capital. Your cash is not free. Every dollar in slow-moving inventory is a dollar not earning margin elsewhere or paying down expensive debt.
- Treating storage as purely fixed. Storage IS semi-variable — more inventory means more shelf space, more labor to manage it, and eventually a larger facility. Allocate proportionally.
- Ignoring obsolescence until it hits. Operators only count spoilage after the markdown. A proper carrying cost rate prices in the expected annual loss rate before it happens.
- Using a single rate for all SKUs. Perishable items and durable goods in the same catalog have wildly different obsolescence profiles. One blended rate misprices both.
How LineNow computes carrying cost
- Estimates a default rate based on your business category (restaurant, grocery, retail) using industry benchmarks from the table above.
- Lets you override each component — plug in your actual interest rate, rent allocation, and historical shrinkage percentage for a custom rate.
- Applies the rate per SKU when calculating Economic Order Quantity, so order quantities reflect the true cost of holding each item.
- Feeds carrying cost into GMROI calculations, showing which items earn enough gross margin to justify their shelf space and which are quietly destroying value.
- Flags "bad deals" — when a volume discount would increase total cost (discount savings minus incremental carrying cost), LineNow surfaces a warning before you confirm the order.
- Recalculates monthly as your average inventory and component costs shift, so EOQ recommendations stay current rather than stale.