FBA vs FBM: Which Fulfillment Model Should You Use?

Every Amazon seller hits this question sooner or later: FBA (Fulfillment by Amazon) or FBM (Fulfillment by Merchant) — which one should I use? My channel is literally called Amazon FBA, but there are cases where I recommend the FBM model instead. It depends on your product, your margins, and where you are in your selling journey.

I have been selling on Amazon since 2018, mostly through FBA. But I have tested FBM and still run one product on it today. So this is not theory — it is based on what I have seen work across multiple businesses.

Key Takeaways

• FBA gives you the highest conversion rate because your product ships from Amazon’s warehouse with Prime eligibility.
• FBM costs less in fulfillment fees but requires a 3PL (third-party logistics) partner and automation to avoid manual order processing.
• Prime access is automatic with FBA but must be earned through performance metrics with FBM.
• Amazon Warehousing and Distribution (AWD) offers cheap intermediate storage that feeds into FBA automatically.
• Use FBA for high-turnover products; use FBM for wide catalogs, slow movers, or fragile items.

How FBA works

Fulfillment by Amazon means you send your inventory — whether it is a wholesale pallet or a small test batch — to an Amazon warehouse. From that point, Amazon handles everything: storage, picking, packing, shipping to the customer, and returns.

The biggest advantage is conversion. Products sitting in an Amazon warehouse ship faster, qualify for Prime, and convert significantly better on the product page. This is the main reason I love FBA and why my channel carries the name. The sales conversion for FBA products is measurably higher than any other fulfillment method.

Beyond conversion, FBA is operationally simple. You do not need to set up integrations with shipping carriers, you do not need a prep center relationship, and you do not need to worry about packaging individual orders. Amazon takes care of it.

The downsides of FBA

Fees. Amazon charges for its service, and it is not cheap. Fulfillment fees, monthly storage fees, inbound placement fees — they stack up fast. You can estimate everything using Amazon’s Revenue Calculator, but most sellers underestimate the total until they see their first bill. I broke down every line item in my true COGS article — read that before you commit to any product.

Loss of control. Amazon can lose your inventory, damage it during check-in, or write it off at your expense. You rely on warehouse staff you will never meet. When something goes wrong, support tickets can take weeks and the answers are often vague.

Labeling and prep. Every box you send to FBA needs specific barcodes — different barcodes for different boxes. If your supplier gets this wrong, Amazon will reject the shipment or fine you. Suppliers in China who have done FBA shipments before handle this well. Local or new suppliers might struggle. The 2026 barcode rules made this even stricter: only brand owners can ship with manufacturer barcodes now, everyone else needs FNSKU stickers.

Money freezing. You send a large batch of inventory to Amazon, and that capital is locked up. If the product sells slowly, you are paying storage fees on top of the capital already tied up in the goods. After 181 days, aged inventory surcharges kick in and can destroy your margin.

How FBM works

FBM means you (or your third-party logistics partner) handle storage and shipping. When an order comes in on Amazon, you or your 3PL picks, packs, and ships it directly to the customer.

The key difference: you need automation. You do not want to process FBM orders manually — that does not scale. There are automation solutions that connect your Amazon order feed to your prep center so the 3PL automatically ships the right product to the right address when an order comes in.

One concern sellers raise is customer experience. With FBA, Amazon packages the product and you have zero input on the unboxing. On one hand, you cannot add custom inserts or branded packaging. On the other hand, Amazon’s fulfillment quality is consistent and reliable. I would not worry about it — there are bigger problems to solve, like lost inventory during check-in or items that get damaged in transit to the warehouse.

With FBM through a good prep center, you actually get more packaging control. You can add branded inserts, use custom boxes, or include promotional materials. That flexibility matters for brand-building sellers.

FBA vs FBM: the five-point comparison

Let me compare both models across the five criteria that matter most.

Shipping speed and quality

FBA wins. Amazon’s delivery network is hard to beat. Two-day Prime shipping is the standard customers expect, and FBA delivers it automatically. No 3PL can match Amazon’s speed and coverage at scale.

Fees

FBA fees are higher on paper, but the math is not as simple as it looks. When you add up 3PL storage, pick-and-pack fees, shipping costs, and the automation software for FBM, the gap narrows. For a standard-size product, it might break even. For oversized products where FBA fees jump dramatically, FBM can save real money. Run the numbers on your specific product before deciding — I covered how to do this in my Amazon FBA profit guide.

Prime eligibility

FBA products automatically get the Prime badge. For FBM, you have to earn it through Seller Fulfilled Prime (SFP), which requires consistently fast shipping, on-time delivery, and low cancellation rates. Most new sellers cannot qualify for SFP right away. The Prime badge increases conversion by 25–50% depending on the category, so this matters.

Control

FBM gives you more control. You choose the prep center, the packaging, and the shipping method. You can inspect inventory before it goes out. With FBA, the check-in process is a black box. Amazon might flag an error on your shipment, claim your supplier did something wrong — and when you check the evidence, everything looks fine. There is little recourse. This lack of control during FBA check-in is one of the most frustrating parts of selling on Amazon.

Launch speed

This is where FBM has a clear advantage. With FBA, you send a shipment and wait for Amazon to check it in. That can take days or weeks, depending on the warehouse. With FBM, you ship to your prep center, they check it in quickly, and you can start selling the same week. Storage rates at most prep centers are far lower than FBA, so there is less pressure if sales start slow.

If you are launching your first product, FBM lets you test demand without committing a large batch to FBA.

AWD and Global Warehouse Distribution

Amazon introduced Amazon Warehousing and Distribution (AWD) as its own answer to third-party prep centers. The concept: you send a large batch of goods to an intermediate Amazon warehouse with cheaper storage rates. From there, inventory either moves to FBA warehouses manually (you trigger the transfer) or automatically as your FBA stock depletes.

AWD is Amazon’s way of keeping inventory in its ecosystem. Storage is cheaper than FBA, the restocking is streamlined, and you do not need a separate 3PL relationship.

There is also a newer option called Global Warehouse Distribution, where your product is stored at an intermediate warehouse in China and shipped to FBA warehouses across different countries as needed. If you sell in both the US and EU, this could simplify your supply chain.

I use AWD sometimes. More often, I ask my supplier to hold excess inventory at their facility and I create FBA shipments roughly once a month, bringing in inventory in stages. This keeps storage costs low without adding AWD as another layer. Choose the approach that matches your cash flow and volume.

When to use FBA vs FBM

Use FBA when:

• Your product has high turnover and steady demand.
• You want Prime eligibility without qualifying for SFP.
• You are selling standard-size products where fulfillment fees are reasonable.
• You want the simplest possible operations — ship to Amazon and forget about it.

Use FBM when:

• You have a wide product catalog with many SKUs.
• Sales velocity is low or unpredictable — you do not want to pay FBA storage on slow movers.
• Your product is fragile, oversized, or requires special handling.
• You are testing a new product and want to start selling quickly without waiting for FBA check-in.

Consider a hybrid approach: Keep your best sellers on FBA for the conversion boost and Prime badge. Run your long-tail SKUs or test products on FBM to keep costs down. Many experienced sellers run both models simultaneously.

Your next step

Pull up your top five SKUs and calculate the full cost comparison: FBA fees (fulfillment + storage + inbound placement) versus FBM costs (3PL pick-and-pack + storage + shipping + automation software). The Revenue Calculator handles the FBA side. For FBM, get quotes from two or three prep centers.

If you are just starting out, FBA is the right call for your first product. The operational simplicity and automatic Prime badge outweigh the higher fees when you are learning the business. Once you have a few products live and understand your unit economics, experiment with FBM for the right SKUs.

I break this down with more examples in the video — watch the full comparison above on my YouTube channel.

Frequently asked questions

Is FBA or FBM better for beginners?

FBA is better for beginners. It handles shipping, returns, and customer service automatically. You do not need a prep center relationship or automation software. Start with FBA, learn the business, then consider FBM once you understand your numbers.

Can I switch from FBA to FBM (or vice versa)?

Yes. You can change your fulfillment method per SKU at any time in Seller Central. Many sellers run both FBA and FBM offers on the same product as a backup — if FBA stock runs out, the FBM listing keeps the product active.

Does FBM hurt my Buy Box chances?

FBM does not disqualify you from the Buy Box, but FBA offers get weighted more heavily in the Buy Box algorithm. If you and a competitor sell the same product at the same price, the FBA offer typically wins. With SFP (Seller Fulfilled Prime), FBM offers compete more evenly.

What is Amazon AWD and should I use it?

Amazon Warehousing and Distribution (AWD) is an intermediate storage service with lower fees than standard FBA storage. Your inventory sits in an AWD warehouse and automatically replenishes your FBA stock as it sells. It is useful if you buy in bulk and want to avoid aged inventory surcharges at FBA warehouses.

How much does a prep center cost for FBM?

Prep center pricing varies, but expect $1–$3 per unit for pick-and-pack plus $0.50–$1.50 per cubic foot monthly for storage. Add shipping costs to the customer (varies by weight and destination) and $50–$200/month for automation software. Compare this total against your FBA fees to see which model wins for your specific product.