Fulfillment by Amazon (FBA)

Fulfillment by Amazon (FBA) is a service that allows third-party sellers to store their inventory in Amazon's global network of fulfillment centers. When a customer orders an FBA product, Amazon picks, packs, ships, and handles customer service and returns on the seller's behalf. FBA automatically qualifies listings for Amazon Prime, making products eligible for free two-day (or same-day) shipping for Prime members.

How FBA Works

1. Inbound shipment: The seller ships inventory to Amazon's designated fulfillment centers. Amazon assigns specific FC destinations based on its placement optimization (distributing inventory across multiple locations to reduce delivery distance to customers).

2. Receiving: Amazon scans, counts, and catalogs the inventory into its systems. Products are stored in Amazon's stochastic inventory system — bins are not product-specific, and identical ASINs may be commingled across inventory from multiple sellers (unless the seller opts for "stickerless" commingling or individual labeling).

3. Order fulfillment: When a customer purchases, Amazon's systems orchestrate picking from the nearest appropriate FC, packing, carrier selection, and label generation — entirely autonomously.

4. Customer service and returns: Amazon handles all post-sale customer contacts, including returns processing. Returned items are assessed for restockable condition.

FBA Fee Structure

FBA fees are substantial but reflect the full-service nature:

• Fulfillment fees: Per-unit fees based on product size and weight. Standard-size items start around $3.22/unit; oversized items start at $9.73/unit.
• Monthly storage fees: $0.87/cubic foot (Jan–Sep); $2.40/cubic foot (Oct–Dec peak). Long-term storage (365+ days) incurs additional surcharges.
• Referral fees: 6–45% of selling price depending on category (charged by Amazon regardless of fulfillment method).
• Aged inventory surcharges: Items stored 181+ days incur progressive daily surcharges.

FBA vs. FBM (Fulfilled by Merchant)

FBA Strategic Considerations

FBA works best for products that are compact, lightweight, fast-turning, and standardized. The math deteriorates for large, heavy, slow-moving products that accumulate long-term storage fees, or for products with high return rates (apparel, electronics) that generate significant return processing costs.

Many mature Amazon sellers use a hybrid approach: FBA for their top-velocity ASINs to maintain Prime badge, FBM or a third-party 3PL for slower-moving or oversized inventory.

Amazon's FBA network includes over 200 fulfillment centers in North America alone, enabling same-day or next-day delivery to most US addresses.