Inventory is one of the largest components of working capital for most product and service businesses. It is also one of the most neglected — not because owners do not care about it, but because once a replenishment system is in place, it tends to run unexamined. That is where the problem starts.

A Field Example: 25 Trucks, One Blind Spot

I worked with a service company operating 25 trucks in the field. Each truck carried an identical parts profile — same items, same quantities across the entire fleet. The replenishment system was automatic. When a part was consumed on a job, it was scanned. The next day, it was replaced. Clean, efficient, and — as it turned out — quietly expensive.

I pulled a consumption report covering twelve months. What I found was predictable once you looked, but invisible without the data: the majority of parts on those trucks were dramatically overstocked relative to actual usage. One specific part stood out — each truck carried 15 units. Across all 25 trucks, that was 375 units sitting in inventory. Annual consumption across the entire fleet: 50 units. The company was carrying roughly seven years of supply on an auto-replenish cycle.

The Two Risks Nobody Talks About Together

Excess inventory carries two costs that compound each other. The first is cash — money tied up in parts sitting on a shelf rather than working in the business. The second is obsolescence. Parts get discontinued. Technology changes. Equipment models turn over. Every unit sitting in excess inventory is a unit that might have to be written off rather than sold.

In the service industry, obsolescence is a particularly acute risk because the equipment being serviced evolves constantly. Carrying five years of supply on a fast-moving product category is not prudent inventory management. It is a liability.

The Fix Was Not Complicated

For the slow-moving, overstocked items, I removed the automatic replenishment trigger. Rather than letting the system continue to top up inventory that was barely being touched, we let the on-hand quantities gradually draw down through normal usage. No emergency purchases, no write-offs, no disruption to field operations. Just a deliberate decision to stop adding to a problem and let the existing stock work itself out.

The result was a meaningful improvement in cash position — not from a dramatic operational change, but from a targeted adjustment to a system that had been running on autopilot for too long.

What This Means for Your Business

If you have an inventory replenishment system, the most important question is not whether it works. It is whether it is calibrated. A system that replenishes automatically without reference to actual consumption patterns is not managing inventory — it is accumulating it.

Pull a twelve-month consumption report. Look at what is actually being used versus what is being carried. The gap between those two numbers is your opportunity. The adjustment required is almost always smaller than expected. The cash recovered is almost always larger.