Guides for Amazon FBA sellers

What Amazon changed, what it costs you, and how to file yourself.

Straight explanations of the 2025 reimbursement rules — no fluff, no guarantees. Each guide ends where the free calculator picks up: your own reports, read line by line.

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.