Understanding Your Inventory Performance Index Score

Understanding Your Inventory Performance Index Score is a question we hear constantly from sellers scaling their online business. Here is what actually moves the needle, based on patterns we see across real accounts.

Why this matters

Splitting inventory across multiple fulfillment centers ahead of peak season reduces placement fee surprises.

What to do about it

• Buy Box share correlates more with price-plus-fulfillment-speed consistency than with price alone.
• FBA storage fees rise sharply in Q4, so trimming slow-moving inventory before October protects margin.
• Long-term storage fees compound monthly — a stagnant SKU can quietly erase its own profit within two quarters.

The takeaway

None of this requires a large team or budget to start — it requires a consistent process. Review the metric or workflow behind "Understanding Your Inventory Performance Index Score" on a fixed schedule, and treat the first pass as a baseline to improve on, not a finished system.