If you're an Amazon seller using Fulfillment by Amazon (FBA), you already know the convenience it offers—but you might not realize how often Amazon overcharges you. Incorrect fees happen all the time, and if you’re not actively looking for them, you’re leaving money on the table.

The good news? You can get that money back. This guide walks you through common FBA fee overcharges, how to spot them, and how to file claims like a pro.

Common FBA Fee Overcharges (And Why They Happen)

Amazon’s fee structure is complex, and errors happen more than you think. Here are the biggest culprits when it comes to overcharges:

  • Weight and Dimension Errors – Amazon charges fulfillment fees based on weight and size, but sometimes they mismeasure your product. If they log incorrect dimensions, you could be paying significantly more per unit.
  • Excess Storage Fees – Amazon charges based on how much space your inventory takes up. If their records show incorrect product dimensions, they’ll overcharge you for storage.

How to Identify Fee Overcharges

Catching Amazon’s fee mistakes isn’t always easy, but it’s crucial. Here’s how to stay on top of it:

  • Check Product Dimensions Regularly – Go to the “Manage Inventory” section, look at the dimensions Amazon has listed, and compare them to your actual product specs. If they’re off, you’re likely being overcharged.
  • Download and Compare Reports – In Seller Central, go to Reports > Fulfillment, and pull the “Fee Preview” report. Compare what Amazon should be charging versus what they are actually charging.
  • Use Automation to Make It Easier – Manually checking for fee discrepancies is tedious. A service like Refully automatically audits your FBA account, detects overcharges, and files claims for you—saving you time and ensuring you get every dollar back.

How to File a Claim

If you find a fulfillment fee overcharge, don’t let it slide. Here’s how to file a reimbursement claim:

  • Calculate Your Reimbursement – Determine the estimated reimbursement for each MSKU by finding the difference between the actual fee and expected fee.
  • Open a New Case – In Seller Central, select “Help” > “My issue is not listed”. Type “FBA product weights and dimensions” in the search box to bring up the widget for measurement-related cases. Select “Remeasure and Reimburse FBA fulfillment fee”, fill out the form with your product measurements, and select the packing type used.
  • Follow Up – Go to "Help" > "Manage Support Cases" in Seller Central and search your Case ID to check the status of the case. If it’s approved, you can go to "Payments" > "Transaction View" to verify that the reimbursement amount matches with what was promised.

Final Thoughts

Amazon’s system isn’t perfect, and their mistakes can cost you thousands if you’re not paying attention. Regular audits and proactive claims are key to protecting your margins.

If you don’t have the time to do it yourself, Refully can handle the entire process for you—auditing your account, spotting overcharges, and filing claims on your behalf.

Don’t let Amazon keep money that rightfully belongs to you. Stay vigilant, file those claims, and make sure every dollar of your profit stays in your pocket.