Amazon FBA vs FBM: Which Fulfillment Method Is Right for Your Business

The FBA versus FBM decision affects your costs, Buy Box eligibility, customer experience, and operational workload. FBA (Fulfillment by Amazon): Amazon stores, picks, packs, and ships your products and handles customer service and returns. Benefits: Prime badge on all your listings; significantly higher Buy Box win rate; no fulfillment logistics to manage; customer service handled by Amazon; multi-channel fulfillment option. Costs: fulfillment fees per unit (size and weight based), monthly storage fees, and long-term storage fees for inventory over 365 days. FBM (Fulfilled by Merchant): you store and ship orders yourself (or via a third-party logistics provider). Benefits: no FBA fees; more control over packaging and inserts; no inventory limits; better for heavy or oversized items where FBA fees are prohibitive; better for slow-moving products where storage fees accumulate. Costs: shipping carrier costs, packaging materials, storage at your own facility, and staff or 3PL costs. When FBA makes sense: your product is light and small (low fulfillment fees); sales velocity is high enough to cover storage costs; you want Prime eligibility without negotiating Seller Fulfilled Prime requirements; you are growing and want to remove fulfillment from your operations. When FBM makes sense: heavy or oversized products where FBA fees exceed shipping costs; slow-moving items with unpredictable demand; seasonal products where sending to FBA only to have it sit costs more than holding it yourself; and custom or personalized products that require special handling.