How Amazon handles FBA storage fees

For many sellers FBA storage fees can be a crucial component to the unit economics of a SKU. However, Amazon is not very transparent as to how your monthly storage fees breakdown on per SKU basis. Both short term and long term storage fees are charged as two separate line items on one of the settlements sent to sellers every 15 days. Your storage fees can be found under "FBA Fees" on the "Selling Fees" section of your settlement inside seller central:

Upon closer examination of the FBA Fees, you can see that storage fees are charged as one sum. Below, the $461.88 charge for "FBA Inventory Storage Fees" represents the storage fee bill for the month of December even though it was charged on January 6th. 

How Ecominate handles storage fees

Inside Ecominate, storage fees are broken down on a per SKU basis based on applying volumetric data to the corresponding storage fee rates. Each individual SKU and day has a storage fee estimate that in aggregate represents a VERY accurate approximation for the actual monthly charge. For profit analytical purposes Ecominate applies the broken down storage fees to the following parts of the application:    

  1. The dashboard sales cards and detailed breakdown
  2. The dashboard sales overview chart
  3. Product breakdown page (sales cards, breakdown, and chart)

The breaking down of storage fees allows Ecominate to offer more detailed profit analytics as storage fees are now applied on a daily and SKU basis. 

Why do storage fees differ on accounting features from the profit analytics features

Ecominate's official accounting features, included inside the accounting tools section, do not include any broken down storage fee estimations. Instead, the actual numbers that were charged on the day it appeared on your settlement is used. This means that date ranges on the Profit and Loss table show storage fees as they were charged on a settlement as opposed to the approximated storage fee breakdown that is used on the dashboard as described above. 

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