Stockouts get all the attention. Every founder knows the pain of missing sales because a bestseller ran out—it's visible, it's frustrating, and it shows up immediately in daily sales numbers. But overstock is the quieter problem, and in our experience, it costs brands more over a full year than stockouts do. It just doesn't announce itself the same way.
Why Overstock Is So Easy To Miss
Overstock doesn't show up as a single dramatic event. There's no alert, no obvious moment where something goes wrong. Instead, it shows up as slowly rising storage fees that get buried in a monthly statement. It shows up as aging inventory sitting in a warehouse for months, eventually needing to be discounted or written off entirely. It shows up as cash that's tied up in stock sitting on a shelf, instead of being reinvested in the products and channels that are actually working right now.
Because each of these effects is gradual and easy to explain away individually, most founders don't realize how much overstock is actually costing them until they sit down and calculate it properly—and the number is almost always higher than expected.
The Root Cause
In almost every audit we run, overstock traces back to the same issue: reordering decisions based on gut feel or last month's numbers, without accounting for seasonality, marketing pushes, or shifting demand.
A common pattern looks like this: a product sells well during a promotional period, so the next reorder is sized based on that elevated demand. But once the promotion ends, demand drops back to normal levels, and now there's excess stock sized for a spike that isn't happening again anytime soon.
Another common pattern: reordering happens based on "what we usually order," a number that was set once, early on, and never revisited as the business and its sales patterns evolved. Six months later, that number no longer reflects reality in either direction—sometimes too much, sometimes too little, but rarely accurate.
The common thread in both cases is the same: decisions are being made reactively, based on whatever data is easiest to remember, rather than through any structured process that actually accounts for the variables that matter.
What This Actually Costs
The direct costs are the ones most founders already sort of know about—storage fees, and the eventual discounting or write-off of aging stock. But there are two costs that are easier to miss.
The first is opportunity cost. Every rupee tied up in overstocked inventory is a rupee that isn't available to invest in restocking your actual bestsellers, testing a new product, or funding a marketing push that would generate real returns. Cash sitting in slow-moving inventory is cash that isn't working for the business.
The second is the compounding effect over time. Overstock in one quarter often leads to conservative reordering in the next, out of caution—which can then lead to stockouts on the products that actually do have demand, because the business has swung too far in the other direction. Without a structured process, inventory planning tends to oscillate between too much and too little, rather than settling into an accurate rhythm.
What To Do Instead
Build a simple forecasting process that looks at trailing sales velocity, upcoming promotions, and lead times together—not in isolation. Even a basic structured approach outperforms reactive reordering.
In practice, this means a few concrete things. Track sales velocity per SKU over a rolling period, not just "how much did we sell last month," so seasonal noise doesn't distort the picture. Build in lead time explicitly—if it takes six weeks to restock, your reorder point needs to account for six weeks of expected sales, not just current stock levels. And revisit reorder quantities on a set schedule, rather than only when something runs out or clearly overstocks.
None of this requires expensive software or a dedicated operations team. For most businesses at this stage, a well-structured spreadsheet reviewed on a consistent schedule is more than enough to catch the vast majority of overstock and stockout issues before they become expensive.
Where To Start
If you suspect inventory might be quietly eating into your margins but haven't actually measured it, that's the first thing worth doing—not guessing, but mapping true carrying costs and aging stock across your actual catalog. A Growth Diagnostic includes exactly this kind of inventory review, alongside the rest of your business fundamentals, so you can see clearly where the real leakage is happening.