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Selling on Amazon

FBA vs FBM: which Amazon fulfillment fits you?

Every Amazon seller makes this choice per product: let Amazon store and ship it (FBA), or ship it yourself (FBM). This guide compares the two side by side, shows when each one fits, explains the hybrid setup most growing sellers end up with, and lists the product data that has to be right either way.

Diego Nijboer · WISEPIMLast updated:

Short answer

FBA (Fulfillment by Amazon) means you send stock to Amazon's warehouses and Amazon picks, packs and ships each order, handles customer service and returns, and makes the offer Prime eligible, in exchange for fulfillment and storage fees. FBM (Fulfilled by Merchant) means you store and ship orders yourself or through your own 3PL, keep control over packaging and stock, and pay no FBA fees, but you handle delivery, returns and customer questions. FBA usually fits small, fast-selling products; FBM fits bulky, slow-moving, fragile or made-to-order items. Many sellers use both.

FBA and FBM compared

The difference is who does the work after a customer clicks Buy. With FBA, Amazon does it with your stock in its warehouses. With FBM, you do it from your own warehouse, shop or fulfillment partner. The listing itself, with its title, images and identifiers, is the same in both cases.

FBAFBM
StorageAmazon fulfillment centersYour own warehouse or 3PL
Picking, packing, shippingAmazonYou
Customer service and returnsAmazon, for FBA ordersYou, within Amazon's return policy
Prime badgeYes, the offer is Prime eligibleOnly through Seller Fulfilled Prime, where offered
CostsFulfillment fee per unit, monthly storage fees, extra fees for aged stockYour own shipping, packaging, storage and staff
ControlAmazon's packaging and prep rulesYour packaging, inserts and carriers
LabelsFNSKU label per unit, unless the barcode is acceptedNone beyond your own shipping labels

When FBA is the better choice

FBA earns its fees when the Prime badge and Amazon's delivery speed lift your sales, and when shipping orders yourself would cost more time than it is worth. Amazon also takes over customer questions about delivery and handles returns for FBA orders.

Watch the storage side. Amazon charges monthly storage fees that rise in the last quarter of the year and adds surcharges for stock that sits too long, so slow sellers can turn unprofitable. Check the current fee pages for your marketplace before you send stock in.

  • Small and light products that sell steadily.
  • Categories where shoppers filter on Prime.
  • Sellers without their own warehouse or with limited shipping capacity.
  • Selling in several EU countries from stock that Amazon moves between its warehouses (Pan-European FBA), keeping in mind that storing stock in a country can create VAT obligations there.

When FBM is the better choice

FBM fits when the FBA fees eat your margin or when Amazon's warehouses are a poor match for the product. You keep your stock in one place for every channel, your own shop included, and you decide on packaging, inserts and carriers.

The trade-off is that you own the customer experience. Amazon measures merchant-fulfilled orders on late shipments, cancellations and valid tracking, and an account that misses its targets can lose the Buy Box or worse.

  • Bulky, heavy or oversized items with high fulfillment fees.
  • Slow movers that would pile up storage fees.
  • Fragile, made-to-order or personalized products.
  • Sellers who already ship fast from their own warehouse for other channels.

The hybrid setup

FBA vs FBM is not an account-wide decision. You choose per offer, and you can even run the same product both ways with two seller SKUs: an FBA offer for Prime shoppers and an FBM offer as a backup when FBA stock runs out.

A common pattern is FBA for the fast, small bestsellers and FBM for the long tail, the bulky items and new products you are still testing. Review the split every quarter, because fees, sales speed and storage limits change.

The product data both need

Whichever you choose, the listing is built from the same product data, and FBA adds a few fields that decide what you pay. Amazon calculates FBA fees from the size tier and weight of the packaged unit, so wrong dimensions cost money on every order.

  • A unique seller SKU per offer, and a separate one if you sell the same product as FBA and FBM.
  • A valid GTIN (EAN or UPC), or a GTIN exemption for products without one.
  • Packaged length, width, height and weight, measured on the real package.
  • Title, bullet points, description and images that follow Amazon's style rules.
  • For FBA: the FNSKU label or barcode setting, and prep requirements such as poly bags for some categories.

Sources

Vendor documentation we read for this guide, as of October 2026. Features and names change, so check the current documentation before you decide.

Frequently asked questions

With FBA (Fulfillment by Amazon), Amazon stores your stock and picks, packs, ships and handles returns for each order. With FBM (Fulfilled by Merchant), you store and ship orders yourself or through your own fulfillment partner.

It depends on the product. FBA usually pays off for small, fast-selling items where the Prime badge lifts sales. FBM is often more profitable for bulky, heavy or slow-selling products, where FBA fulfillment and storage fees are high.

Only through Seller Fulfilled Prime, where Amazon offers it. It requires fast, reliable delivery that meets Amazon's performance standards.

Yes. Create two offers with different seller SKUs on the same listing, one fulfilled by Amazon and one by you. Many sellers keep the FBM offer as a backup when FBA stock runs out.

FBM stands for Fulfilled by Merchant. Amazon also calls it merchant fulfillment: the seller ships the order instead of Amazon.

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