In short: carrying inventory costs roughly 20 to 30 percent of its value per year once you count storage, insurance, shrinkage and tied-up cash. A product that sits for twelve months has already eaten a quarter of its margin. Measure turnover per item, clear anything under two turns a year, and buy narrower instead of deeper.
Most shop owners read their stockroom as savings. The boxes are paid for, they are worth something, and selling them later feels like money waiting. The accounting agrees with that view, which is the problem. Inventory sits on the balance sheet as an asset and never shows up on the profit line as the expense it quietly is.
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Run the number once and the mood changes. Carrying cost, the sum of warehousing, insurance, damage, theft, obsolescence and the interest you are not earning on that cash, lands between 20 and 30 percent of inventory value per year in most retail estimates. On $40,000 of stock that is $8,000 to $12,000 annually, before you sell a thing.
Turnover is the only number that matters here
Inventory turnover is cost of goods sold divided by average inventory value. A shop turning six times a year replaces its entire stock every two months. A shop turning twice a year holds each item for six months on average. Same revenue, very different businesses.
The trap is the blended figure. Your overall turnover might look respectable at four, while a third of your SKUs turn once and the fast sellers carry the average. Pull the report per item, not per store. The dead weight hides inside the healthy number.
Read the third column carefully. The carrying cost per dollar of stock is identical in every row, because it is charged on value held, not on how well the item sells. Slow items pay the same rent as fast ones and bring in a fraction of the gross margin. That is the whole argument.
Why owners refuse to mark down
The resistance is emotional and it has a name in behavioural economics: the sunk cost fallacy. You paid $18 for the unit, so selling at $14 feels like losing $4. It is not. The $18 left your account months ago. Your only live decision is whether $14 today beats $18 in a year that may never come, minus another year of carrying cost.
Markdowns still need arithmetic, because discounting changes the volume you need. A 10 percent cut on a 40 percent margin product means you need roughly a third more units to earn the same gross profit, which is why a 10% discount can need 33% more sales just to break even. On dead stock that math is acceptable, because the alternative is zero. On your best sellers it is a slow bleed.
- Pull a stock-age report monthly and flag everything past 120 days
- Cut 20 percent at day 120, 40 percent at day 180, clear the rest at day 240
- Never reorder an item that failed two markdown rounds
- Bundle slow items with fast ones instead of discounting the fast ones
- Agree return or exchange terms with suppliers before the first order, not after
- Track gross margin return on inventory, not just margin percentage
Buy narrower, not shallower
The instinct after a dead-stock scare is to order less of everything. That creates empty shelves and lost sales, which costs more than the carrying cost you saved. The better correction is fewer lines, more depth in the ones that move. Twelve products you can keep in stock beat forty you cannot.
Cash is the second reason to care. Inventory converts to cash slowly and bills do not wait, so a shop can be profitable on the P and L and still miss payroll. That is the same mechanism behind the cash-flow trap that closes small shops, and overbuying is its most common cause.
Clearance also has a free channel attached. Your existing buyers open your emails and already trust your taste, which is why the math favors the customers you already have when you need to move 30 units fast. A list of 600 past buyers will outperform a paid ad for a discontinued line every time.
Open your point of sale tonight, sort every SKU by last sale date, and list everything untouched for 120 days. Price the first markdown round this week and set a calendar reminder for day 180. Do not wait for the quarter to end.
Source: Inventory turnover, Wikipedia
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