Key takeaways
- FBA moves storage and shipping to Amazon; FBM keeps them with you.
- Evaluate the model product by product.
- Fees and rules change, so recheck current Amazon documentation.
- Hybrid models need documented rules.
Who does what
With Fulfillment by Amazon (FBA), you send inventory to Amazon fulfillment centers and Amazon stores, picks, packs and ships orders and handles much of the customer service for them. With Fulfillment by Merchant (FBM), you store and ship products yourself or through a logistics partner.
Operational comparison
The practical differences show up in several areas:
- Inventory: FBA needs inbound shipment planning; FBM needs your own stock control.
- Shipping performance: FBM sellers are responsible for handling times, tracking and late shipments.
- Returns: FBA returns follow Amazon's process; FBM returns arrive at your location.
- Costs: FBA charges fulfillment and storage fees; FBM costs are your own shipping and warehousing.
Product-level thinking
Size, weight, margin, fragility and sales velocity all influence the better model. Bulky, low-margin items can behave very differently from small, fast-moving ones.
Running both
Hybrid accounts need clear rules: which SKUs use which model, how stock is split and who monitors each workflow.
Customer service and returns
Under FBA, Amazon handles customer service for many order issues and processes returns through its network, though sellers still manage listings, claims and some cases. Under FBM, you are responsible for responding to buyers, handling returns and meeting delivery promises.
This difference changes staffing needs. FBM requires dependable processes for tracking, communication and refunds, and a plan for peak periods.
Costs and cash flow
FBA involves fees for fulfillment and storage and requires paying for inventory sent to Amazon in advance. FBM costs are your own warehousing, packing and carrier expenses, with stock held where you control it. Compare using real data for each product, including returns and damage, rather than assuming one model is always cheaper.
Deciding by product
Create a short scoring table for each SKU covering size, weight, value, fragility, sales velocity and margin. Review it at least twice a year, because fees, volumes and your own logistics costs change.
Common mistakes when choosing a model
Sellers sometimes choose FBA for every product by default, even where size, weight or low margin make fees hard to absorb. Others stay on FBM too long, struggling with delivery promises and customer service as order volume grows.
Review fulfillment choices as products mature. A product that began on FBM during testing may be better on FBA at scale, and the reverse can be true for slow movers or bulky items.
Operational risks to plan for
On FBA, the main risks are inbound delays, receiving discrepancies, stranded inventory and changing fees. On FBM, they include late shipments, tracking errors, carrier problems and rising customer-service load. Hybrid accounts carry both sets and need clear monitoring for each.
List the top risks for each model and name an owner and a check frequency so they are monitored deliberately.
Frequently asked questions
Can I switch a product between FBA and FBM?
Generally yes, but check current Seller Central guidance on inventory and listing changes before switching.
Which is cheaper?
It depends on size, weight, volume and your own logistics costs. Compare using real numbers for each product.
This guide is general information. Amazon's fees, policies and program rules change and vary by marketplace, so confirm current details in Seller Central and, for tax or legal questions, with a qualified adviser.