Carrying cost

Carrying cost — also called inventory holding cost — is the total annual cost a business incurs by holding inventory. It is one of the most often understated costs in operations: businesses see the warehouse rent and the insurance premium but tend to overlook the capital cost and the obsolescence allowance, which are usually larger.

What carrying cost includes

Cost of capital — the largest component for most businesses. Inventory ties up cash that could otherwise be deployed elsewhere. The cost is the firm’s weighted-average cost of capital applied to the average inventory value. For a business with a 10% cost of capital and $1 million in average inventory, the capital cost alone is $100,000 per year.

Storage — warehouse rent, racking, lighting, climate control, and security. Often charged per pallet, square metre, or cubic metre.

Insurance — coverage against fire, flood, theft, and damage. Typically a fraction of a percent of inventory value per year.

Obsolescence and shrinkage — the proportion of inventory that becomes unsaleable through expiry, damage, theft, or product end-of-life. Highly category-dependent: groceries write off significant percentages, durable goods very little.

Depreciation — for inventory categories where stored items lose value over time independent of use, such as fashion or technology.

Material handling — labour and equipment cost of moving inventory within the warehouse, picking, and packing. Some of this is variable with throughput rather than inventory level, but a portion is genuinely a holding cost.

Taxes — where applicable, charges levied on inventory value held at certain dates in the year.

Typical magnitudes

Total carrying cost commonly runs at 18–35% of inventory value per year for most businesses. Capital cost alone is typically 8–15%, storage 2–5%, insurance and tax 1–2%, and obsolescence and shrinkage anywhere from 1% to 15% depending on category.

A business that knows its true carrying cost percentage can use it to drive smarter decisions across the inventory cycle: ordering policy, supplier selection, product range curation, and pricing.

Why it matters

Carrying cost is the H term in the economic order quantity formula. Underestimating it produces order quantities that are too large and inventory levels that are too high, with all the cost that flows from those decisions. Overestimating it produces over-frequent ordering and stockout risk.

The most common error in practice is to ignore carrying cost altogether, treating inventory as if it were free to hold once purchased. The result is overstocked warehouses, slow-moving SKU bloat, and steady margin erosion that does not appear on any single line of the income statement but quietly compounds across the year.