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Inventory carrying cost is what it costs to hold stock for a year — capital, storage, insurance, handling and obsolescence — typically 20-30% of inventory value. The formula, each component explained, a worked example, and how to reduce it without causing stockouts.
Short answer: inventory carrying cost (or holding cost) is the total annual cost of keeping inventory on hand, expressed as a percentage of its value. It adds up capital cost, storage, insurance, taxes, handling, and the risk of obsolescence or damage. For most companies it lands between 20% and 30% a year — meaning every $100,000 of inventory costs $20,000-30,000 a year just to hold. It's the number that turns "we have too much stock" from an opinion into a decision.
The formula
Carrying cost % = (Capital cost + Storage + Insurance & taxes + Handling + Obsolescence & shrinkage) ÷ Average inventory value
Annual carrying cost = Average inventory value × Carrying cost %
Average inventory value = (Opening inventory + Closing inventory) ÷ 2
The components
| Component | What it includes | Typical share |
|---|---|---|
| Capital cost | Interest on money tied up, or the return you'd earn elsewhere | 8-15% |
| Storage | Rent, utilities, racking, warehouse space | 2-5% |
| Insurance & taxes | Inventory insurance, property taxes on stock | 1-3% |
| Handling | Labor to receive, move, count and pick | 2-5% |
| Obsolescence & shrinkage | Expiry, damage, theft, items that stop selling | 3-8% |
| Total | ~20-30% |
Capital cost is usually the largest — and it rose with interest rates, which is why carrying cost matters more in 2026 than it did five years ago.
Worked example
A distributor carries an average of $2.4M of inventory:
| Component | Annual cost |
|---|---|
| Capital cost (10%) | $240,000 |
| Storage | $96,000 |
| Insurance & taxes | $36,000 |
| Handling | $72,000 |
| Obsolescence & shrinkage | $120,000 |
| Total | $564,000 |
Carrying cost % = 564,000 ÷ 2,400,000 = 23.5%
So cutting average inventory by $400,000 saves roughly $94,000 a year — and if that $400,000 is dead stock, it costs nothing in service.
How to reduce it without stockouts
- Clear dead stock first — zero service impact by definition.
- Recalculate reorder points on actual lead times; many are set on old, longer ones.
- Size safety stock with a formula, not a feeling — buffer inventory explained.
- ABC classification: tight control on the 20% of items that are 80% of value.
- Negotiate smaller, more frequent deliveries with key suppliers.
- Improve inventory accuracy so you stop holding extra "just in case the system is wrong."
Where to find the numbers
Average inventory value comes from the balance sheet or the item ledger. Storage, insurance and handling come from the P&L. Capital cost is your borrowing rate or cost of capital. An ERP gives you inventory value and movement by item; the carrying rate you set once a year and apply. In Business Central, inventory value and aging by item are standard reports, and a Power BI view puts carrying cost next to margin per item. The Profit Leak Audit calculates it from your data on any ERP.
FAQ
How do you calculate inventory carrying cost? Add up the yearly cost of capital, storage, insurance, taxes and obsolescence, divide by the average inventory value and multiply by 100 to get the carrying cost rate. Multiply that rate by the inventory you hold to get the cost in money. The simulator above does it for you as you change the safety stock.
What is the definition of carrying cost? Carrying cost, or the carrying cost of inventory, is the total yearly cost of holding stock: the money tied up in it, storage and handling, insurance, taxes, and the value lost to damage, expiry or obsolescence. It is usually expressed as a percentage of the average inventory value.
What are the components of inventory carrying cost? Capital cost (what the cash tied up in stock could earn elsewhere), storage, insurance, taxes, handling, and the risk of obsolescence, shrinkage or damage. Together they typically add up to 20-30% of inventory value a year.
What's a normal carrying cost? 20-30% of inventory value per year for most businesses. Perishables and fast-obsolescence goods run higher.
Is carrying cost the same as holding cost? Yes — the terms are interchangeable.
Does carrying cost include ordering costs? No. Ordering costs (placing and receiving orders) are separate; the two are balanced in the economic order quantity (EOQ) formula.
How do I use it in decisions? Compare the carrying cost of holding extra stock against the cost of a stockout. Hold more only where the stockout cost is higher.
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