Costback
Free estimate · no account

How much is Amazon quietly keeping?

Amazon’s reimbursement math changed in 2025: undocumented inventory gets valued at Amazon’s own estimate, not yours. Run a rough benchmark from your revenue, or upload your Reimbursements report for the precise gap. We only read that report, never buyer data.

Quick estimate

A benchmark range built from published FBA discrepancy rates — not a read of your account.

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This is a benchmark, not your balanceA revenue-based range says what accounts your size typically leave outstanding. Only your Reimbursements report can name the actual lines.
No email needed to see the number.

Costback is a software tool for Amazon FBA sellers. It is not affiliated with, endorsed by, or sponsored by Amazon. Costback does not file claims on your behalf and does not guarantee any reimbursement — Amazon decides all claims. Figures shown are estimates based on your own reports and published industry benchmarks, not a promise of recovery.