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This article applies to selling in: United States

FBA inventory storage overage fees

If your existing inventory exceeds your storage limits for a given month, you will be charged an inventory storage overage fee in addition to monthly inventory storage fees and, if applicable, long-term storage fees. The overage fee is based on how many days your storage limits are exceeded. This charge will occur even if your inventory is subsequently reduced to a level below your storage limits allocated for that month. It will be charged monthly at $10 per cubic foot based on the daily average volume (measured in cubic feet) for any space your inventory occupies in Amazon fulfillment centers beyond your storage limits. For more information, visit FBA inventory storage limits.

The volume measurement is based on unit size when properly packaged and ready to ship in accordance with FBA policies and requirements. Amazon reserves the right to measure or weigh packaged units or representative samples and to determine the storage type. In the event of any conflict between an Amazon measurement and information provided by the seller, Amazon's measurement will govern.

Timeline and example

The following example illustrates how this fee is assessed and charged:

Event with sample date Sample values
Inventory storage overage fee accrues on July 1
The seller’s inventory exceeds their standard-size storage limit by 100 cubic feet, so they will incur an overage fee of $10 per cubic foot, or $1,000 total, if no action is taken (to be assessed and charged in August). Standard-size storage limit 1,000 cubic feet
Space taken by existing standard-size inventory 1,100 cubic feet
Current standard-size overage 100 cubic feet
Potential storage overage fee $1,000
Seller reduces inventory exceeding limit on July 5
The seller creates a removal order for 80 cubic feet of standard-size inventory on July 5. No other standard-size inventory is sold or removed during July. Standard-size overage, July 1 – 4 100 cubic feet
Standard-size removal, July 5 80 cubic feet
Standard-size overage, July 5 – 31 20 cubic feet
Inventory storage overage fee billed in August
The July seller’s average overage was 30.322 cubic feet. They will be charged $10 per cubic foot for a July total of $303.22. July average standard-size overage 30.322
Storage overage fee per cubic foot $10
Total July storage overage fee $303.22

Determining storage limit status

You can check if you are over your limit at any time by viewing the Storage Monitor on the Inventory Performance dashboard or in the Shipping Queue. You will see an alert icon if you are over your limit. If you are over your limit, you can calculate your current overage for that storage type by subtracting your current usage from your current storage limit. We will also send you weekly alerts if you are over your limit for each storage type and you will incur inventory storage overage fees.

Inventory storage overage fees report

The Inventory storage overage fees report provides the inventory storage overage fees for each storage type and day your inventory in Amazon fulfillment centers exceeded your storage limits. This month-end report is available for download starting the second day of the following month. It is available from the Reports menu by selecting Fulfillment and on the resulting page selecting Inventory storage overage fees under Payments on the left.

Field names

Download header Description Example value
charged_date Date the usage exceeded the limit and when the estimated fee applies. The format is month-day-year. 8/1/2020
country_code Country in which the overage usage occurred. US
storage_type Type of storage for which the usage exceeded the limit and an estimated fee applies. Note that sortable is the same as standard-size. Sortable or Non_Sortable
charge_rate Monthly inventory storage overage fee rate for a storage type. 10.00
storage_usage_volume Storage usage on the charge date. This applies to the storage type for which usage exceeded the limit and an estimated fee applies. 600
storage_limit_volume Storage limit for the storage type that exceeded its limit and for which an estimated fee applies. 500
overage_volume The volume of storage usage that exceeded the storage-type limit on the charged date. 100
volume_unit Unit of measurement for the storage limit, usage, and overage. cubic feet
charged_fee_amount Amount of the inventory storage overage fee that was incurred by this storage type on the charged date. 32.26
currency_code Currency of the overage fee. USD

Calculating the monthly inventory storage overage fee estimate

We provide an estimate of your monthly inventory storage overage fee by storage type using the following formula:

Estimated monthly overage fee = (current overage x daily overage rate x charge days remaining in month) + monthly overage fees incurred to date

Current overage = current usage – current limit

Daily overage rate = $10 / number of days in current month

Charge Days Remaining in Month = number of days in current month – current day number + 1


Standard-size storage limit = 100 cubic feet

Inventory = 110 cubic feet

Today = July 12

Charge days in current month = 31 – 12 + 1 = 20

Daily overage rate = $10 / 31 = $0.322581

Current overage = 10 cubic feet

Monthly overage fees incurred to date = $50 (calculated from overage already incurred in days 1-11)

Estimated monthly overage fee = (10 * $0.322581 x 20) + $50 = $114.5162

Important: This estimate applies to any storage type when your inventory has incurred overage fees in the current month. It is a monthly estimate and assumes that no action has been taken on any inventory that currently exceeds your storage limits. The estimate should be used for reference only. Charges are not finalized until after the end of each month.

Calculating cubic feet from inches

  1. Multiply length x width x height in inches to get the volume.
  2. Divide the volume by 1,728, which is 12 cubic inches.
Example: A unit measuring 47 x 12 x 10 inches divided by 1,728 = 3.3 cubic feet.

Frequently asked questions

How do I know if I am subject to the inventory storage overage fee?

If you have a Professional selling account, you are subject to the overage fee if you have exceeded your current limits for a given storage type by the end of the day for any day in a given month. This charge will occur even if your inventory was subsequently reduced to a level below your storage limits allocated for that month.

How can I determine which SKUs are contributing to my current usage for a storage type?

Current usage is a real-time representation of your on-hand inventory minus any pending removals. FBA Inventory Age provides a list of all of your active FBA listings, along with their storage type (standard-size, oversize, apparel, footwear, flammable, or aerosol) and how much volume the ASIN is taking up (Available units x volume per unit = cubic feet). This information is also available via the Inventory Age report.

While the Inventory Age data is good way to approximate current usage, it may not match your current usage value displayed on the Storage Monitor for a few reasons.

  1. Current usage is a real-time data source, and the Inventory Age report data may be delayed up to 72 hours due to data processing times.
  2. Current usage includes unsellable inventory and excludes any units pending removal, and these values are not included on the Inventory Age and the associated report.
  3. Inventory that does not have an active listing may be counted in current usage (such as stranded inventory).

When will I be charged inventory storage overage fees?

You will be charged applicable inventory storage overage fees after the end of the month in which the fees were incurred. For example, let’s say that you exceeded your storage limit on July 1 and removed inventory to a level below your limit by July 5. On August 1, you would be charged for the four days you were over the limit in July.

Do inventory storage overage fees apply to flammable and aerosol storage?

No, overage fees are not charged if you exceed your flammable or aerosol storage. Overage fees apply only to standard-size, oversize, apparel, and footwear storage types.

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