Sell on Amazon Sign In
This article applies to selling in: Japan

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 31,727JPY per cubic meter based on the daily average volume (measured in cubic meters) for any space your inventory occupies in fulfillment centers beyond your storage limits. For more information, go to 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.

Determining storage limit status

You can check the status of your inventory limit at any time by viewing the Storage volume on the Inventory Performance dashboard or in the Shipping Queue, and you'll see an alert icon if you're over your limit. If you're over your limit, you can calculate your current overage for that storage type by subtracting your current usage from your current storage limit. We'll also send you monthly alerts if you're over your limit for each storage type and you'll 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 fulfillment centers exceeded your storage limits. This month-end report is available for download starting the second day of the following month.

Report field names

Download header Description Example value
incur_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. JP
storage_type Type of storage for which the usage has exceeded the limit and an estimated fee applies.
Note: sortable is the same as Standard-size; non_sortable is the same as Oversize
Sortable or Non_Sortable
charge_rate Monthly inventory storage overage fee rate for a storage type. 31,727
storage_usage Storage usage on the charge date. This applies to the storage type for which usage exceeded the limit and an estimated fee applies. 30.8
storage_limit Storage limit for the storage type that exceeded its limit and for which an estimated fee applies. 28
storage-overage The volume of storage usage that exceeded the storage-type limit on the charged date. 2.8
storage-measurement Unit of measurement for the storage limit, usage, and overage. cubic meter
estimated-fee Amount of the inventory storage overage fee that was incurred by this storage type on the charged date. 88,835
currency Currency of the overage fee. JPY

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 = 31,727JPY / number of days in current month

Charge days remaining in month = number of days in current month – current day number + 1

Frequently asked questions

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

If you have a Professional selling account and your IPI score is less than the required threshold on both of two score checkpoints before a quarter , you are subject to inventory storage limits. If you've exceeded your current limits for a given storage type by the end of the day, for any day in a given month, you'll be subject to the overage fee. 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. Manage Inventory Health provides a list of all of your FBA listings, along with their storage type (standard-size, oversize, apparel, footwear) and how much volume the ASIN is taking up (Available units x volume per unit = cubic meter). This information is also available via the Manage Inventory Health 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 volume 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'll 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.

Why do I have overage fees when I don't have any excess inventory?

If your existing inventory exceeds your storage limits for a given month, you'll be charged an inventory storage overage fee. Storage limits are calculated based on available fulfillment center capacity, historical IPI scores, and your sales volume. For more information about how storage limits are determined, go to FBA inventory storage limits.

Excess inventory is calculated based on a different set of rules. Visit Inventory Performance Help page to learn more about excess inventory.

If you're over your storage volume limits, but you don't have excess inventory, we suggest you reduce or remove your oldest or slowest-moving inventory as soon as possible.

What if I believe I've been charged incorrectly for overage fees?

You can submit disputes when you believe you have been charged incorrectly up to 90 days from the date the fee was applied to your account.

To see if you're eligible for an overage fee reimbursement due to dimension issues, go to FBA fees reimbursement policy: Weight and dimensions.

Sign in to use the tool and get personalized help (desktop browser required). Sign In

Reach hundreds of millions of customers

Start selling on Amazon

© 1999-2022,, Inc. or its affiliates