Fulfillment by Amazon (FBA) or Fulfillment by Merchant (FBM)? It's one of the first operational decisions a brand makes — and it affects your fees, your Buy Box, your Prime eligibility, and your margins. Here's how to choose.
What each model actually means
FBA: you ship inventory to Amazon's warehouses; they store, pick, pack, ship, and handle customer service and returns. FBM: you store and ship orders yourself (or via a 3PL) and handle service.
Why most private-label brands choose FBA
- Prime badge — instant access to Prime members, who convert far better.
- Buy Box advantage — FBA offers are heavily favored for the Buy Box.
- Hands-off logistics — Amazon handles the operational load so you can focus on growth.
- Customer trust — "Ships from and sold by" reassurance and easy returns.
When FBM makes sense
- Large, heavy, or low-margin products where FBA fees eat your profit.
- Very high-value or fragile items you'd rather control end to end.
- Slow-moving SKUs where long-term storage fees would pile up.
- Backup during stock-outs — FBM can keep a listing live when FBA runs dry.
The hybrid approach
You don't have to choose globally. Many mature brands run FBA on their fast-moving core products and FBM on the bulky or slow ones — and keep an FBM offer ready as insurance against FBA stock-outs, which protects rank.
Run the math per SKU
The right answer is rarely philosophical — it's a spreadsheet. Compare FBA fees plus storage against your FBM shipping and handling cost, factor in the conversion lift from the Prime badge, and decide SKU by SKU.
Bottom line: FBA wins for most private-label sellers thanks to the Prime and Buy Box advantage — but the heaviest, slowest SKUs deserve a closer look. Not sure how your catalog pencils out? Book a free audit.