Amazon uses several performance metrics to determine how much FBA storage capacity sellers receive. Accounts that manage inventory efficiently are generally rewarded with more storage capacity, while accounts with excess or slow-moving inventory may face tighter limits.
Understanding how inventory performance impacts storage capacity can help sellers maintain healthy inventory levels and avoid shipment restrictions.
📊 What Is Inventory Performance?
Inventory performance measures how effectively a seller manages their FBA inventory.
Amazon evaluates factors such as:
Sell-through rate
Excess inventory levels
Aged inventory
Inventory turnover
Inventory Performance Index (IPI)
These metrics help Amazon determine how efficiently warehouse space is being used.
🏷️ What Is the Inventory Performance Index (IPI)?
The Inventory Performance Index (IPI) is Amazon's scoring system for measuring inventory health.
A higher IPI score generally indicates:
Better inventory management
Faster inventory movement
Efficient use of storage space
A lower IPI score may indicate:
Excess inventory
Slow-moving products
Overstocking
Long-term storage issues
📦 How Inventory Performance Impacts Storage Capacity
Amazon allocates storage capacity based in part on how efficiently sellers manage inventory.
Sellers with strong inventory performance may receive:
Higher storage capacity
Greater shipment flexibility
Fewer storage restrictions
Sellers with poor inventory performance may experience:
Reduced storage limits
Shipment restrictions
Lower available capacity
Increased storage fees
🚚 How Poor Inventory Performance Can Affect Shipments
When inventory performance declines, Amazon may limit the amount of inventory that can be sent to fulfillment centers.
This can result in errors such as:
This product exceeds the allowed volume for SORTABLE storage.
or
Shipment exceeds available capacity.
Even if products are eligible for sale, limited capacity may prevent additional inventory from being shipped.
⚠️ Common Factors That Reduce Capacity
Several factors can negatively impact inventory performance:
Excess Inventory
Products that remain in storage longer than necessary.
Aged Inventory
Inventory that has not sold for extended periods.
Low Sell-Through Rate
When inventory enters fulfillment centers faster than it sells.
Overstocking
Sending too much inventory relative to demand.
💡 How to Improve Inventory Performance
To maintain healthy storage capacity:
Remove Slow-Moving Inventory
Regularly review and remove inventory that is not selling.
Improve Sell-Through Rates
Focus on replenishing inventory that sells consistently.
Avoid Overstocking
Send inventory based on expected demand.
Monitor Inventory Health Reports
Review Seller Central reports regularly to identify potential issues.
Maintain a Healthy IPI Score
Consistent inventory management helps maximize available storage capacity.
🔍 Where to Monitor Inventory Performance
You can review inventory performance within Seller Central by visiting:
Inventory → Inventory Planning → Inventory Performance Dashboard
This dashboard provides:
IPI score
Inventory health metrics
Storage utilization
Capacity information
✅ Summary
Amazon uses inventory performance metrics, including the Inventory Performance Index (IPI), to determine storage capacity allocations. Maintaining healthy inventory levels, strong sell-through rates, and efficient inventory management can help increase available storage capacity and reduce shipment restrictions.