How to Reduce Inventory Costs Without Sacrificing Service Levels

Most inventory reduction programmes fail for the same reason. They cut the stock the business can see, celebrate the working capital release, and then spend the following quarter explaining service failures. A few months later the stock is back, now with a layer of expediting cost on top.

## Inventory is a symptom, not the disease Stock accumulates where the planning process cannot cope. It is bought as insurance against forecast error, against unreliable lead times, against a supplier that delivers in full only sometimes, and against the fear of being the person who ran out. Cutting the number without addressing the cause simply removes the insurance and leaves the risk. That is why the reduction rarely holds.

## Where the real excess sits In most businesses the excess is concentrated, and it is rarely where the spreadsheet suggests:

• Obsolete and end-of-life stock that nobody has been empowered to write off
• Slow-moving variants held to protect a range rather than a customer
• Safety stock calculated once and never reviewed, sized for a forecast accuracy that no longer applies
• Duplicate cover held at several levels of the network because no one trusts the level behind it
• Raw material bought on a supplier discount that exceeds the cost of holding it

## Service level is a target, not an outcome Service level should be a deliberate decision per product or per customer segment, not a single company-wide aspiration. The top two hundred lines that carry most of the revenue justify far more protection than the tail. Once the target is explicit, the inventory required to hit it can be calculated rather than negotiated, and the conversation moves from how much stock to hold to what service is worth paying for.

## Segmentation before optimisation Any credible reduction starts with segmentation. Group items by volume and variability, or by margin and criticality, and apply a different policy to each group. Fast, stable movers can run lean. Slow, erratic items need a different rule entirely, often one that trades a small amount of stock for a large reduction in expediting. Applying one policy across a mixed portfolio is how businesses end up simultaneously overstocked and short.

## The sequence that works Improve the forecast where it can genuinely be improved, shorten and stabilise lead times where the supplier relationship allows, then recalculate safety stock against the new reality. Only then reduce. Each step pays for the next, and the reductions hold because the underlying variability has actually fallen.

## Measuring it Track inventory, service and expediting cost together, weekly. Any one of them alone can be improved by damaging the other two, which is exactly what a cost-cutting programme does. sofco's supply planning makes all three visible in one plan. Estimate the potential with our ROI calculator or ask our advisory team to review your inventory policy.