Costback
Free estimate · no account

How much is Amazon quietly keeping?

Two ways to find out: a rough benchmark from your revenue, or the precise read from your own Reimbursements report. We only read your Reimbursements report — never buyer data.

Quick estimate

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

$
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.