FBA Inventory Reimbursement: How the Payout Is Calculated (and What to Do When It's Wrong)

What FBA Inventory Reimbursement Actually Covers

FBA inventory reimbursement is Amazon's process for repaying you when your stock is lost, damaged, or mishandled while it's under Amazon's control — inside a fulfillment center, in transit between warehouses, during a customer return, or during a removal order you requested.

The scenarios that qualify are specific:

• Lost or damaged inventory inside a fulfillment center
• Missing inbound shipments — units that never get checked in after you ship them to Amazon
• Lost-in-transit units, either seller-to-Amazon or Amazon-to-customer
• Customer returns that go missing, get mis-graded, or never get restocked
• Removal and disposal claims — inventory damaged while Amazon processes a removal order
• Reversals — cases where Amazon pays you, then claws the money back later

Cancelled shipments that still generated a charge fall in here too. None of this is a favor Amazon does you; it's contractual. Amazon holds and moves your inventory, and if it damages or loses it, it owes you the value. The problem is that value stopped meaning what most sellers assume it means.

How Amazon Calculates the Payout — A Worked Example

Until March 31, 2025, Amazon generally reimbursed lost or damaged units close to their average selling price. Since that date, Amazon has run a cost-based model: reimbursement is calculated on your manufacturing (sourcing) cost, not what the item sells for. Amazon pulls that figure from the Inventory Defect and Reimbursement (IDR) portal, either as an estimate or from the cost data you've entered against your COGS in Seller Central.

Say 200 units go missing at a fulfillment center. At an average selling price of $24, the old model would have paid close to $4,800. Under the cost-based model, if your manufacturing cost on file is $8 a unit, the payout is $1,600 instead — a $3,200 gap on one shipment, and that gap is entirely a function of whether the cost figure sitting in the IDR portal is current.

Full Circle has managed more than $500M in revenue across 100+ brands. The single biggest driver of a lower-than-expected reimbursement across that book isn't a rejected claim — it's a manufacturing cost figure in the IDR portal that's two SKU revisions and one supplier change out of date. Nobody disputes the number, because nobody's looking at it until the check is smaller than expected.

Claim Windows: How Long You Actually Have

Amazon also tightened how long you have to file, and the windows differ by claim type and by whether Amazon files automatically or leaves it to you. The table below is the structure as currently published — Amazon has changed these day counts before and will again, so treat the pattern as the durable fact and confirm exact numbers in Seller Central before you file.

The pattern that matters: warehouse-side losses get shorter windows and more automation, while returns and removals get longer windows and more manual work on your end.

When the Reimbursement Is Wrong, Denied, or Missing

Three situations come up constantly, and each has a different fix.

The amount is lower than expected. Check the manufacturing cost Amazon has on file in the IDR portal against your actual COGS. If it's stale, update it and request a recalculation — this won't retroactively fix past payouts, so the real fix is keeping cost data current before the next loss, not after.

The claim was denied or reversed. Amazon can and does reverse a reimbursement it already paid, usually after locating the inventory or reclassifying the loss. Keep your own shipment and receiving records; a reversal without documentation on your side is one you can't contest.

Nothing happened at all. Automatic reimbursement covers most lost and damaged inventory and most customer return issues, but it doesn't reliably cover removal losses or mishandled returns — those still need a manual claim inside the window, and Amazon won't remind you.

One more thing worth saying plainly: if the money is disappearing from your ad account rather than your warehouse — wasted spend chasing an ASIN that's actually out of stock — that's not a reimbursement problem, and no reimbursement tool will find it. That's a job for Dr. PPC, not for anything in this article.

The Mistakes That Cost Sellers the Most

The most expensive mistake is assuming the old rules still apply — filing a manual dispute expecting selling-price reimbursement, getting the cost-based number back, and treating it as an error instead of the new baseline. It isn't an error. It's the policy.

The second is letting COGS data go stale. If you haven't touched the cost figures in the IDR portal since you changed suppliers or renegotiated a unit price, Amazon is reimbursing you against a number that isn't true anymore.

The third is trusting automation completely. We've made a version of this mistake ourselves: filing a manual claim for units that were, in fact, still legitimately in transit rather than lost, based on a discrepancy report that hadn't caught up yet. Amazon reversed it weeks later. In-transit and lost are not the same status, and filing too early costs you a second dispute instead of one clean payout.

Where This Fits Into a Bigger Leak

Dr. Stock is Amazon inventory and supply chain run as a managed product by Fable 5, from Full Circle. Reimbursement recovery — lost and damaged units, shipment discrepancies, removal-versus-liquidation calls — is one leak among several it works, alongside stockouts, aged-inventory surcharges, and FBA fee or dimensional-weight errors. The client sets how much runs on autonomy; purchasing decisions always stay with a human. There's no published price — it's a demo and a 30-day free run, priced on the call. If you'd rather just check your own IDR cost data this week, the fix above works with or without any vendor.