Amazon FBA (Fulfillment by Amazon)

Amazon FBA (Fulfillment by Amazon) is a service where sellers send their inventory to Amazon’s fulfillment centers, and Amazon handles storage, picking, packing, shipping, customer service, and returns processing. When a customer places an order, Amazon’s warehouse staff picks the product from its bin or shelf, packs it in an Amazon-branded box or envelope, and ships it to the customer, typically within one or two business days for Prime members. The seller pays Amazon a per-unit fulfillment fee, monthly storage fees, and other applicable charges in exchange for this end-to-end logistics service.

How FBA Works

The process starts with the seller creating a shipping plan in Amazon Seller Central, specifying which products and quantities will be sent to Amazon. Amazon assigns the inventory to one or more fulfillment centers based on its network optimization algorithms. The seller (or their prep center) labels each unit with an FNSKU barcode, palletizes or boxes the shipment according to Amazon’s packaging requirements, and ships it to the designated fulfillment centers via LTL, FTL, or small parcel.

Once Amazon receives the inventory, the units are scanned, verified, and stowed in bin locations across the fulfillment center. From that point, Amazon controls the fulfillment process. Orders are picked, packed, and shipped using Amazon’s carrier network. Amazon handles all customer inquiries about shipping status, delivery issues, and returns for FBA orders. Returned products are evaluated at the fulfillment center and either restocked (if in sellable condition) or classified as unfulfillable.

FBA Fee Structure

Amazon’s FBA fees include several components. The fulfillment fee is a per-unit charge based on the product’s size tier and weight. For a standard-size item weighing 10 ounces, the fulfillment fee is approximately $3.00 to $4.00 (fees adjust annually). Oversize items incur higher per-unit fees, often $8.00 to $20.00 or more depending on dimensions and weight.

Monthly storage fees are charged per cubic foot of space the inventory occupies. Standard rates run approximately $0.87 per cubic foot from January through September and $2.40 per cubic foot from October through December, when warehouse space is at a premium. Aged inventory surcharges apply to units stored for more than 181 days, with escalating rates at 271 and 365 days.

The inbound placement service fee, introduced in 2024, charges sellers who ship inventory to a single fulfillment center. Amazon uses this fee to fund the redistribution of that inventory across its network. Sellers can reduce or eliminate this fee by shipping to multiple inbound locations as directed by Amazon’s shipping plan.

Advantages of FBA

The primary advantage is Prime eligibility. FBA products automatically qualify for Amazon Prime’s free one-day and two-day shipping, which significantly increases visibility and conversion rates. Prime members spend more per year than non-Prime members, and they filter search results to show only Prime-eligible products. Losing Prime eligibility by switching to FBM (Fulfillment by Merchant) typically results in a measurable drop in sales velocity.

FBA also offloads the operational burden of warehousing, pick-and-pack, and shipping. Sellers without warehouse space, labor, or logistics expertise can focus on product sourcing, marketing, and brand development while Amazon handles fulfillment. This is particularly valuable for solo entrepreneurs and small teams who cannot staff a warehouse operation.

Challenges and Considerations

FBA is not without drawbacks. Sellers lose direct control over the packaging and presentation of their products. Amazon packs FBA orders in Amazon-branded packaging, and there is no option for custom unboxing experiences. Storage limits restrict how much inventory a seller can keep at Amazon’s warehouses, requiring careful inventory planning and often a domestic buffer warehouse or prep center to stage reserve stock.

Inbound preparation must meet Amazon’s standards. Every unit needs an FNSKU label, poly bagging for certain product types, bubble wrap or overbox for fragile items, and suffocation warnings on bags over a certain size. Sellers who cannot handle prep in-house use third-party prep centers like MeisterPrep to receive imports, inspect products, apply labels, and reship to Amazon’s fulfillment centers in compliance with FBA requirements.