How often should I count inventory?

Count by value and velocity rather than on a single calendar. A common split counts the top fifth of SKUs by value monthly or more, the middle band quarterly, and the long tail once or twice a year. Anything with a recurring discrepancy moves up a band until the cause is found.

Counting frequency is a diagnostic tool as much as a control. A SKU that keeps drifting between counts is reporting a process fault at receiving, picking, or returns, and counting it more often locates it.

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