An FBA seller is a third-party merchant who sells products on Amazon but lets Amazon handle storage, packing, shipping, customer service, and returns. FBA stands for Fulfillment by Amazon, and it’s the logistics backbone behind millions of product listings on the platform. Instead of shipping orders from a garage or warehouse, an FBA seller sends inventory to Amazon’s fulfillment centers and lets Amazon do the rest once a customer clicks “buy.”
How FBA Works Step by Step
The FBA model splits responsibilities between you and Amazon. Your job is sourcing products, creating listings, setting prices, and shipping inventory to Amazon’s warehouses. Amazon’s job is everything that happens after a customer places an order.
Here’s the typical workflow. You create an Amazon seller account, then set up FBA through Seller Central (Amazon’s dashboard for merchants). You list your products in Amazon’s catalog and label them as FBA inventory. Then you pack and ship those products to one or more Amazon fulfillment centers, following Amazon’s packaging and labeling guidelines.
Once your inventory arrives, Amazon stores it in their warehouse. When a customer orders one of your products, Amazon employees pick it from the shelf, pack it, and ship it to the customer’s door or pickup point. Amazon also handles payment processing, inventory tracking, customer support inquiries, and returns. If a buyer wants a refund, Amazon processes that too. You receive your share of the sale after Amazon deducts its fees.
Why Sellers Choose FBA
The biggest draw is Prime eligibility. Products fulfilled through FBA automatically qualify for the Prime badge, which signals fast, free shipping to Amazon’s massive Prime membership base. That badge shows up in search results and can significantly boost your visibility and conversion rate. Winning the “Featured Offer” (the default Buy Box that most customers use to add items to their cart) also becomes easier with FBA, since Amazon favors listings with fast, reliable delivery.
FBA shipping costs 70% less per unit than comparable premium shipping options from other major U.S. carriers, according to Amazon. That price advantage comes from Amazon’s scale and negotiated carrier rates, which individual sellers would struggle to match on their own. For sellers moving high volumes, FBA also eliminates the need to rent warehouse space, hire packing staff, or manage shipping logistics directly.
The hands-off nature appeals to sellers who want to focus on product sourcing, marketing, or launching new items rather than spending their days taping boxes and standing in line at the post office.
What FBA Costs
FBA isn’t free. Amazon charges several layers of fees that eat into your profit margins, so understanding them before you start is essential.
Referral fees are a percentage of each sale that Amazon takes as its commission for letting you sell on the platform. The percentage varies by product category but typically falls between 8% and 15% of the selling price.
Fulfillment fees cover the picking, packing, and shipping Amazon does on your behalf. These vary by product size and weight. As of January 2026, standard-size products priced between $10 and $50 carry fulfillment fees that increased by $0.05 to $0.25 per unit compared to the prior year. Products priced below $10 get a discounted fulfillment rate (averaging $0.86 less per unit than higher-priced items). Bulky and extra-large items actually saw fee decreases of roughly $0.26 to $2.08 per unit, though they may also incur a packaging fee averaging $2.07 per unit if the product can’t ship in its own packaging.
Monthly storage fees are charged based on how much space your inventory occupies in Amazon’s warehouses. Rates are calculated per cubic foot and tend to spike during the holiday season (October through December). If your products sit unsold for a long time, aged inventory fees kick in. Items stored for 12 to 15 months cost $0.30 per unit or $6.90 per cubic foot per month, whichever is greater. Items sitting longer than 15 months jump to $0.35 per unit or $7.90 per cubic foot.
On average, FBA fees increased by about $0.08 per unit in 2026, which Amazon says is less than 0.5% of a typical item’s selling price. Still, those small amounts compound quickly when you’re moving thousands of units.
Account Types for FBA Sellers
Before using FBA, you need an Amazon seller account. Amazon offers two tiers. The Individual plan has no monthly subscription but charges $0.99 per item sold. It’s designed for people selling fewer than 40 items a month and comes with limited access to selling tools. You can’t run promotions, use bulk listing features, or access Amazon’s advertising platform.
The Professional plan costs $39.99 per month regardless of how many items you sell. It unlocks bulk listing tools, advertising, API access for automation, Buy Box eligibility, and detailed sales reports. If you plan to sell more than 40 units a month, the Professional plan is cheaper on a per-item basis and gives you the tools needed to scale.
Both account types can use FBA, but serious FBA sellers almost always opt for the Professional plan because the advertising and automation tools are critical for driving traffic to listings.
FBA vs. Fulfilling Orders Yourself
The alternative to FBA is Fulfilled by Merchant, or FBM, where you store inventory and ship orders directly to customers. FBM gives you full control over packaging, shipping speed, and the unboxing experience. Some sellers prefer it because they can include branded inserts, handwritten notes, or custom packaging that Amazon’s warehouses won’t provide. FBM also avoids storage fees entirely and makes sense for sellers with specialized products that require careful handling.
The trade-off is significant, though. FBM sellers don’t automatically get the Prime badge, which limits visibility. There is a program called Seller Fulfilled Prime that lets FBM sellers earn the Prime badge, but it requires a Professional account, meeting strict performance benchmarks, and completing a 30-day trial to prove you can deliver at Prime speed consistently.
Many established sellers use both. They put their best-selling, fast-moving products in FBA to capture Prime traffic, and fulfill slower-moving or oversized items themselves to avoid racking up storage fees on inventory that might sit for months.
Inventory Limits and Performance
Amazon doesn’t give FBA sellers unlimited warehouse space. As of January 2026, Amazon shifted from a quarterly storage limit system to a monthly capacity model. Your storage allocation is now recalculated each month based on your performance. Sellers with strong sell-through rates, low excess inventory, and high Inventory Performance Index (IPI) scores get more space. The IPI is a score Amazon assigns based on how efficiently you manage your inventory, factoring in things like how quickly products sell and how much dead stock you’re holding.
This system rewards sellers who keep their inventory lean and penalizes those who send in large quantities of slow-moving products. If your IPI drops too low, Amazon can restrict how much new inventory you’re allowed to send in, which directly limits your ability to restock popular items. Staying on top of inventory health is one of the less glamorous but most important parts of running an FBA business.
What It Takes to Succeed as an FBA Seller
Becoming an FBA seller is straightforward. Building a profitable FBA business is not. The logistics are handled for you, but the hard work is everything that comes before a product reaches Amazon’s warehouse: finding products with healthy margins, negotiating with suppliers, creating listings that rank well in Amazon search, running advertising campaigns, and managing cash flow while inventory is in transit.
Your margins need to absorb referral fees, fulfillment fees, storage fees, advertising costs, and the cost of goods. A product that sells for $25 might net you $5 to $8 after all fees, depending on its size and category. Sellers who don’t run those numbers carefully before committing to inventory often find themselves breaking even or losing money.
FBA removes the fulfillment burden, but it doesn’t remove the need to run a real business. The sellers who do well treat it that way: tracking their numbers, managing inventory carefully to avoid aged-inventory fees, and continuously optimizing their listings and ad spend.