ACCEPTABLE QUALITY LIMIT (AQL) FOR PRODUCT INSPECTIONS
Most comparisons of FBA and FBM are written for someone deciding how to sell. This one is written for someone who has already committed: you have a supplier in Asia, a purchase order, and a container coming. The question is no longer whether to sell on Amazon. It is what happens to your goods between the factory gate and the customer, and which model leaves you exposed.
Two things have changed the arithmetic in 2026, and neither appears in the comparison tables you will find elsewhere.
FBA vs FBM in 30 Seconds (Quick Comparison Table)
| FBA (Fulfillment by Amazon) | FBM (Fulfilled by Merchant) | |
|---|---|---|
| Who stores the goods | Amazon | You, or your third party warehouse |
| Who picks, packs and ships | Amazon | You |
| Who handles returns and customer service | Amazon | You |
| Prime eligibility | Automatic | Only through Seller Fulfilled Prime, with performance thresholds |
| Amazon prep requirements | Yes, and since January 2026 entirely at your cost | No. The goods never enter a fulfillment center. |
| Compliance requirements (Prop 65, CPSIA, testing) | Yes | Yes. Identical. FBM changes nothing here. |
| Who sees the goods before the customer does | Nobody | You, or your warehouse |
| Best for | Small, light, fast moving items | Heavy, bulky, slow moving, custom or hazardous items |
The two rows that matter most are the last two, and they are the two that no other comparison covers.
What Is Amazon FBA? (Definition + How It Works)
Under Fulfillment by Amazon, you ship your inventory to an Amazon fulfillment center. Amazon stores it, and when an order comes in, Amazon picks, packs, ships and handles the return if there is one. Your listing is Prime eligible by default.
The trade is straightforward: you give up handling, and you give up sight of the goods. Your inventory goes from the factory in Asia to a warehouse you will never visit, and the next person to touch that unit is the customer who bought it.
What Is Amazon FBM? (Definition + How It Works)
Under Fulfilled by Merchant, the listing is on Amazon and the fulfilment is yours. The goods sit in your warehouse or your third party logistics provider's warehouse, and you ship each order yourself.
You keep the handling, the storage cost, the customer service and the returns. You also keep the goods in your own supply chain, where you can still look at them.
FBA vs FBM: Cost Comparison
Amazon revised its fees more than once in 2026 alone, so this page does not reproduce them. What it does instead is name the cost lines and explain what makes each one move, because the rate matters far less than whether the line applies to your product at all.
Where FBA costs you
| Cost line | What drives it |
|---|---|
| Referral fee | A percentage of the sale price, varying by category. Applies to FBA and FBM alike. |
| Fulfillment fee | Charged per unit, driven by size and weight. This is where heavy and bulky products get punished. |
| Monthly storage fee | Charged per cubic foot, and higher in the fourth quarter peak. Driven by volume and by how slowly your stock moves. |
| Aged inventory surcharge | Charged on stock that has been sitting too long. This is the fee that turns a slow seller into a loss. |
| Inbound placement fee | Charged per unit, depending on how many fulfillment centers Amazon has to spread your shipment across. |
| Low inventory level fee | Charged when your stock cover is persistently thin relative to demand. |
| Inbound defect fee | Charged per unit when a shipment does not match the plan or arrives non compliant. |
| Fuel and inflation surcharge | Applied on top of fulfillment fees. |
| Prep | Since January 2026, this is entirely yours. See the next section. |
Where FBM costs you
| Cost line | What drives it |
|---|---|
| Referral fee | The same percentage of the sale price. There is no escaping this one. |
| Storage | Your own warehouse or your 3PL's, priced by whatever deal you struck |
| Pick, pack and shipping | Per order, and usually worse per unit than Amazon's negotiated rates unless you have volume |
| Customer service and returns | Your staff, your time, your process |
| Seller Fulfilled Prime, if you want the Prime badge | Performance thresholds, weekend delivery, and the operational cost of hitting them |
For the actual figures on your specific product, use Amazon's own calculator, which is public and always current: https://sell.amazon.com/pricing/estimate
The general shape holds regardless of the rates. FBA punishes weight, volume and slowness. FBM punishes low order volume and operational immaturity.
Considering FBA? Get an inspection quote for your factory in Asia
What Changed in 2026: Amazon Stopped Prepping Your Units
On 1 January 2026, Amazon ended its in-house prep and item labelling services for US FBA shipments. Poly bagging, FNSKU labelling, bubble wrapping, boxing, bundling: Amazon no longer does any of it for you, at any price.
| Before 2026 | Now | |
|---|---|---|
| FBA prep | Optional. Amazon would do it for a fee. | Entirely yours. Done at the factory, at a prep centre, or in your own warehouse. |
| FBM prep | Not applicable. Goods never enter a fulfillment center. | Unchanged. Still not applicable. |
The consequence is simple. Amazon added a cost and an operational burden to FBA, and added nothing to FBM. If you were marginal between the two models, 2026 moved the line.
Most comparisons treat this as a logistics question: who does the prep now, and what do they charge. For an importer it is a sourcing question. The cheapest place to prep is the factory that is already handling your goods, and the factory does not know Amazon's rules. The prep moved to Asia, and nothing moved with it to check that it was done right.
One thing FBM does not save you from
Prep is a fulfillment center requirement. Compliance is the law. Switching to FBM removes the poly bags, the FNSKU labels and the master carton markings. It removes nothing at all from Proposition 65, CPSIA, product testing, or your obligation to produce a compliant test report when Amazon asks for one, which it will, in either model. If you are choosing FBM to escape compliance work, you have misread the problem.
FBA vs FBM: Control & Flexibility (Returns, Customer Service, Branding)
| FBA | FBM | |
|---|---|---|
| Returns | Amazon handles them, and is generous with the customer at your expense | You handle them, and you see what came back and why |
| Customer service | Amazon | You |
| Packaging and unboxing | Amazon's box, Amazon's experience | Yours |
| Inserts and branding | Restricted | Yours, within Amazon's rules |
| Speed of reaction to a quality problem | Slow. You do not have the goods and cannot inspect them. | Fast. The goods are in your warehouse. |
The last row is the one that becomes expensive. When a batch turns out to be defective under FBA, you find out from your reviews, and the corrective action is a removal order that takes weeks and costs money. Under FBM you open a box.
FBA vs FBM: Quality Control Considerations
Fulfilment comparisons discuss defect rates, but they mean fulfilment defects: late shipments, cancellations, wrong items. This section is about the other kind, the defect that came out of the factory, and it is the one that costs importers the most money.
Amazon's receiving process is a check-in, not a quality inspection. Amazon describes it plainly: associates scan the shipping label, open the carton, set aside anything that still needs prep, perform a six-sided visual check of each unit for damage, and verify that the product matches the listing title. Then the unit is stowed.
Read that list again for what is not on it. Nobody switches the product on. Nobody opens it. Nobody compares it to your approved sample or to your specification. There is no sampling plan and no AQL.
A unit passes Amazon's check-in with a failing solder joint, the wrong voltage, a cracked internal component, a substituted material or a non-compliant chemistry, because none of that is visible from six sides.
Amazon is verifying that it can store and ship your unit. It is not verifying that your unit works.
Now follow that through.
| FBA | FBM | |
|---|---|---|
| Who could catch a manufacturing defect before the customer | Nobody | You, or your warehouse, if you look |
| Where a defect surfaces | In a customer review, a return, and an A-to-Z claim | In your own warehouse, if you look |
| What it costs when it surfaces | Returns, refunds, a damaged rating, and potentially a suspended ASIN | A rework, a supplier conversation, and a credit note |
| How fast you can react | Slowly. The goods are in a warehouse you cannot enter. | Immediately |
The line that decides this
Under FBM, a factory inspection is your first line of defence, and you have a second one in your own warehouse. Under FBA, the factory inspection is not your first line of defence. **It is your only one.** After the container is sealed, the next person to open that unit and form an opinion about it is the customer who bought it, and their opinion becomes public.
To be honest about the counter argument: most FBM sellers do not inspect their goods either, and a 3PL unloading a container is not running an AQL sampling plan. Neither model inspects for you. The difference is not that FBM catches defects. It is that FBM leaves you the possibility of catching them, and FBA removes it entirely.
That is why the pre-shipment inspection matters more under FBA than under FBM, not less. See our FBA inspection service and the complete guide to what Amazon requires at receiving.
FBA vs FBM: Prime Eligibility & Buy Box
FBA listings are Prime eligible automatically. FBM listings are not, unless you qualify for Seller Fulfilled Prime, which means meeting Amazon's performance thresholds on your own logistics: on-time delivery, cancellation rate, valid tracking, and weekend delivery coverage. Performance is reviewed weekly and failure removes the badge.
For Buy Box competitiveness, fulfilment method is one input among several, alongside price, seller performance and delivery speed. FBA tends to help because Amazon's own delivery promise is fast and reliable. FBM can compete on the Buy Box, but only if the operation behind it is genuinely good.
The practical rule for an importer: if your product competes on convenience and delivery speed, FBA's Prime badge is worth real money. If it competes on specification, price or specialism, it is worth less than you think.
Get an inspection quote for your factory in Asia
When to Choose FBA (5 Scenarios)
[CHECKLIST] - Small, light and fast moving. Fulfillment fees scale with size and weight, and storage fees scale with time. A small item that sells quickly is exactly what FBA is priced for. - You are competing on delivery speed. The Prime badge is the point. - You have no warehouse and no logistics team. Building one to save fees is a false economy at low volume. - Your catalogue is simple. Few SKUs, few variations, low prep complexity. - Your quality is genuinely under control. This is the condition nobody states. FBA is a good model when your goods are right, and an expensive one when they are not. [/CHECKLIST]
When to Choose FBM (5 Scenarios)
[CHECKLIST] - Heavy, bulky or oversized. The fulfillment fee and the storage fees on a large item can exceed your margin outright. - Slow moving or seasonal. Aged inventory surcharges are what turn a slow seller into a loss. - Hazardous, restricted or regulated goods that Amazon will not store, or will only store under conditions you cannot meet. - Custom, made-to-order or configurable products. These cannot sit in a bin waiting to be picked. - You want eyes on the goods. If your supplier is new, your product is complex, or your defect risk is real, FBM keeps the goods in a chain you control. [/CHECKLIST]
Hybrid Approach: Using Both FBA and FBM
Most established importers end up running both, and split the catalogue rather than the business.
The usual pattern: fast moving, small, proven SKUs go to FBA, where the Prime badge and Amazon's logistics earn their fee. Heavy, slow, seasonal, new or quality-risky SKUs stay on FBM, where the storage economics are yours and the goods stay visible.
A hybrid also buys you a hedge. When a container arrives and you are not certain about it, FBM lets you sell through the first units yourself and see what comes back, before committing the rest to a warehouse you cannot enter.
Decision Framework: Which One for Your Product?
Work through these in order. The first clear answer usually decides it.
| Question | If yes | If no |
|---|---|---|
| 1. Is the product heavy, bulky or oversized? | FBM. The fulfillment fee and the storage fees will eat the margin. | Continue |
| 2. Is it hazardous, restricted, or does it need special storage? | FBM, or check Amazon's restrictions before anything else | Continue |
| 3. Is it slow moving, seasonal, or unproven? | FBM first. Prove the demand before you pay Amazon to store it. | Continue |
| 4. Is it custom or made to order? | FBM. It cannot be picked from a bin. | Continue |
| 5. Is this a new supplier, a complex product, or a first production run? | Either model, but do not ship without an inspection. Under FBA especially, this is your only checkpoint. | Continue |
| 6. Is it small, light, fast moving and quality-proven? | FBA. This is what it is priced for. | Reconsider from question 1 |
Notice that question 5 does not resolve to a fulfilment model. It resolves to a checkpoint. The fulfilment decision is about economics. The inspection decision is about whether the goods are right, and it applies to both models. It simply matters more under FBA, because under FBA there is nothing after it.
For the compliance requirements that apply regardless of which model you choose, see our guide to compliance testing for Amazon.
Considering FBA? Get an inspection quote for your factory in Asia
Frequently Asked Questions
What is the difference between FBA and FBM?
Under Fulfillment by Amazon (FBA), you send your inventory to an Amazon fulfillment center, and Amazon stores it, picks it, packs it, ships it and handles returns. Under Fulfilled by Merchant (FBM), the listing is on Amazon but the fulfilment is yours: the goods stay in your warehouse or your third party logistics provider's warehouse, and you ship each order yourself. The referral fee applies in both cases. The practical difference for an importer is that under FBA the goods leave your control at the factory and the next person to open the box is the customer.
Is FBA or FBM more profitable?
It depends on the product rather than on the model. FBA charges by size, weight and time in storage, so it rewards small, light, fast moving items and punishes heavy, bulky or slow moving ones. FBM has no fulfilment or storage fee to Amazon, but you carry warehousing, picking, packing, shipping and customer service yourself, which is usually more expensive per unit unless you have volume. Run your specific product through Amazon's public calculator rather than relying on a general rule.
Did Amazon change the FBA rules in 2026?
Yes, and it changed the arithmetic between the two models. On 1 January 2026, Amazon ended its in-house prep and item labelling services for US FBA shipments. Poly bagging, FNSKU labelling, bubble wrapping, boxing and bundling are no longer done by Amazon at any price: every unit must arrive fully prepped, whether that prep happens at your factory, at a prep centre or in your own warehouse. FBM was not affected, because FBM goods never enter a fulfillment center. In other words, Amazon added a cost to FBA and added nothing to FBM.
Does switching to FBM avoid Amazon's compliance requirements?
No, and this is an expensive misunderstanding. Prep requirements (poly bags, FNSKU labels, master carton markings) are fulfillment center receiving rules, so they do not apply to FBM. Compliance requirements are law, and they apply to the product regardless of how it is fulfilled. Proposition 65, CPSIA, product testing and the obligation to produce a valid test report when Amazon requests one apply identically under FBA and FBM. FBM changes who packs the box. It changes nothing about whether the product is legal to sell.
Do I need Prime for FBM?
You do not need it, but you can have it through Seller Fulfilled Prime, which lets an FBM listing carry the Prime badge if your own logistics meet Amazon's performance thresholds. Those cover on-time delivery, pre-fulfilment cancellation rate, valid tracking and weekend delivery coverage, and performance is reviewed weekly. Failing the thresholds removes the badge. Check Seller Central for the current figures, because Amazon revises them.
How does quality control differ between FBA and FBM?
Amazon's receiving process is a check-in, not a quality inspection. Associates scan the shipping label, open the carton, set aside units that still need prep, perform a six-sided visual check of each unit for damage, and verify that the product matches the listing title. What does not happen is a functional test, a comparison against your approved sample or specification, or any sampling plan against an AQL. Nobody switches the product on. A unit therefore passes check-in with a failing solder joint or a substituted material, because neither is visible from six sides. The consequence is that under FBA, the first person to discover a defective unit is the customer, and their opinion becomes a return, a review and potentially a suspended listing. Under FBM the goods pass through your own warehouse, so you retain the possibility of catching a defect. Neither model inspects for you. The difference is that FBM leaves you a chance to look, and FBA removes it, which is why a factory inspection matters more under FBA rather than less.
Can I switch from FBM to FBA?
Yes. You can convert a listing to FBA from Seller Central, and many sellers move individual SKUs between the two models as their economics change. What you cannot do retroactively is inspect goods that are already in an Amazon fulfillment center: a removal order takes time and costs money. If you are planning to move a SKU to FBA, the inspection needs to happen before the goods ship, not after you change the listing.
What products are better for FBM?
Heavy, bulky and oversized items, where fulfilment and storage fees can exceed the margin. Slow moving and seasonal stock, where aged inventory surcharges accumulate. Hazardous and restricted goods that Amazon will not store. Custom and made-to-order products that cannot be picked from a bin. And anything from a new supplier or a first production run, where keeping the goods in a supply chain you control is worth more than the Prime badge.