Supply Chain

Inventory Is Not Free: What 6.75% Money Does to the Cost of Sitting Stock

Every dollar of inventory is a dollar borrowed or a dollar not invested, and when money is expensive, that cost bites harder. Here is what the current rate environment does to the stock sitting on your floor.

Inventory looks like an asset on the balance sheet and behaves like a cost on the floor. Every unit sitting in a rack is capital tied up, either borrowed money accruing interest or cash that could be earning a return elsewhere, plus the storage, insurance, handling, and obsolescence that pile on top. The financing slice of that carrying cost moves with interest rates, and with the prime rate at 6.75% (Aug 6, 2026), with no prior-year reading archived yet, holding inventory is more expensive than it was through the low-rate years. Lean is not just an operations philosophy in this environment; it is a financing decision.

The carrying cost, worked

Take a plant holding $2,000,000 of inventory. The financing component alone, at the current prime rate, is about $135,000 a year. Add the rest of carrying cost, storage space, insurance, shrinkage, handling, and obsolescence risk, and total carrying cost commonly runs in the range of prime plus another 8 points or so, putting the all-in figure near $295,000 a year on that $2,000,000 of stock. That is real money leaving the business for the privilege of holding goods that are not yet sold, and the financing part of it rises directly with the rate environment.

Low rates hid the cost of inventory. High rates put it back on the invoice, and it is bigger than most plants have recalculated it to be.

Why high rates reward inventory turns

When money is cheap, carrying extra inventory as a buffer against stockouts is a defensible insurance policy. When money is expensive, the same buffer is a costlier bet, and improving inventory turns, selling and replacing stock faster so less capital sits idle, becomes a direct financing win. The practical move is to recompute carrying cost at the current rate rather than a stale assumption, then let that number drive reorder points, safety stock levels, and the make-versus-buy calls that pile inventory onto the floor. A rate-aware carrying cost turns lean from a slogan into a dollar figure.

The carrying-cost record

Across the five-year record the prime rate is still working down from a peak rather than building a new level. The high came at the close of 2023 near 8.50%, and today's 6.75% sits 21% below it, in the upper third of its five-year range. That gap is the fact worth carrying, because the reference point most people hold in their heads is the peak, and the record has spent years saying the peak was the anomaly.

Use the carrying cost calculator with the current rate to find what your stock actually costs to hold each year. Price your inventory

Published 2026-08-06.