Understanding FBA Inventory Storage Overage Fees and How They're Calculated
Amazon charges FBA sellers $10 per cubic foot for inventory that exceeds their assigned capacity limits. This fee applies daily and is calculated monthly, making capacity management critical for controlling costs.
Overview
Amazon charges FBA sellers an inventory storage overage fee when their inventory in fulfillment centers exceeds assigned capacity limits. This fee is separate from standard monthly storage fees and the aged inventory surcharge, making it an important cost to monitor for sellers managing large or fluctuating inventory levels.
As of January 1, 2024, Amazon has discontinued FBA inventory storage overage fees in certain international stores. However, the fee remains active in other marketplaces, so sellers should verify whether it applies to their specific store.
Key Points / What Sellers Need to Know
- Overage fees are triggered by exceeding capacity limits — If the inventory stored in Amazon's fulfillment centers (excluding open shipments in transit) goes beyond your assigned capacity limit, the overage fee kicks in automatically.
- The fee is $10 per cubic foot — This rate applies to the daily average volume of inventory that exceeds your capacity limit, calculated on a monthly basis.
- Fees are based on your highest available limit — Amazon uses the highest capacity limit it has provided for the period, whether that limit was an estimate or a confirmed figure.
- Once triggered, the fee sticks for that period — Even if you reduce your inventory below the capacity limit later in the billing period, the overage fee still applies for the days you were over the threshold.
- Volume is measured by packaged unit size — Amazon measures storage volume based on the unit size when properly packaged and ready to ship according to FBA policies, and Amazon's measurements take precedence over seller-provided dimensions.
How the Overage Fee Is Calculated
The inventory storage overage fee is calculated on a daily basis and then charged monthly. Amazon determines your daily overage by subtracting your capacity limit from your actual inventory usage in cubic feet. For example, if your capacity limit is 500 cubic feet and your usage on a given day is 600 cubic feet, you have 100 cubic feet of overage for that day.
The daily rate is derived by dividing the $10 per cubic foot annual rate by the number of days in the billing month. For a 30-day month, this works out to approximately $0.33 per cubic foot per day. Your daily overage volume is then multiplied by this daily rate to determine the fee for that specific day. In the example above, 100 cubic feet of overage at $0.33 per cubic foot would result in a $33 charge for that single day.
Analysis & Recommendations
Why This Matters
Overage fees can add thousands of dollars in unexpected costs for sellers who exceed their capacity limits. Understanding how the fee is calculated helps sellers make informed restocking decisions and avoid profit erosion.
Key Takeaways
- Overage fee is $10 per cubic foot based on daily average volume exceeding your capacity limit
- The fee applies even if you later reduce inventory below the limit during the same billing period
- Amazon's own measurements of package dimensions override seller-provided data
- Some international stores eliminated this fee as of January 2024, but it remains active in other marketplaces
Recommended Actions
- →Monitor your FBA capacity limits in Seller Central's Capacity Monitor and plan inbound shipments to stay within thresholds
- →Create removal orders for slow-moving or excess inventory before approaching your capacity limit
- →Factor potential overage fees into your financial planning, especially during seasonal inventory buildups
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