Amazon FBA vs FBM: Which Fulfillment Method Is Right?

Short Answer

FBA (Fulfillment by Amazon) means that all of your inventory is sent to Amazon’s warehouse, and they are responsible for handling the storage, packing, shipping, and customer service. FBM (Fulfillment by Merchant) means that you are responsible for storing, packing, and shipping your products yourself.

The choice between the two is visible in your margins, ability to win the Buy Box, and ultimately your PPC efficiency and ranking.

How FBA Works

FBA works in a simple way. You send the inventory to the Amazon fulfillment center, and they take over completely. They are in charge of packing your products and handling the shipping within 1-2 days, processing the returns, and answering customers' questions.

Your only job is to monitor the inventory levels and send more stock when you’re running low.

FBA Fees: What You're Actually Paying

FBA is not just one fee but a series of fees that are stacked on top of each other. Here is everything you need to pay:

Referral Fee

Regardless of method, Amazon takes a cut of every sale you make, and the cut depends on the category you are in. Media and Office supplies are at 8%. Shoes and Video Games are at 15% to 18%.

Most of the home and beauty products are about 15%. So if you sell a $30 item in the beauty category, Amazon will take $4.50 right away.

Fulfillment Fee

This is the fee that Amazon charges for picking, packing, and shipping your order.

• A small product that has a standard size costs about $2.50 to $3.75.
• Larger items run $3 to $5.50.
• Really big or heavy items cost $15 or more.

On low-priced products, this fee can wipe out your margin, which is why FBA is the best fit for products that are priced above $20.

Monthly Storage Fee

Amazon charges a monthly fee for taking up space in their warehouse. While this is a small fee per month, it compounds the longer your inventory sits. So, if you have lots of units that are holding stock for months, this quietly eats into your margins.

Long-Term Storage Fee

It’s like a penalty for slow-moving products, as Amazon will charge an extra yearly fee on top of the monthly fee if your products are in an Amazon warehouse for more than a year. The longer you leave them there, the more it costs you.

Seasonal Storage Fees

In October and December, Amazon doubles their storage rate because this period is a time when warehouse space is in demand during the holiday rush. If you are stocking up for Q4, you can't overlook these fees , as sending too much inventory too early can get costly.

FBM Advantages

• You have more margin on the right products. FBM can be profitable for heavy, oversized or low-priced items that lose money with FBA fees. FBM puts that difference back into your pocket. If your 3PL or shipping costs are lower than what Amazon would charge to fulfill that same item, you keep the difference.
• You decide how your product looks when it arrives. When you use FBA, your product will be shipped in a plain Amazon box. With FBM, it is different, since you can decide the packaging. You can add your logo, a thank-you card, and a small gift for the customer. These details are important because that’s how you can make a buyer come back to you again.
• You stay in control of your stock. Changing your stock levels, pulling products, running promotions on other platforms or changing your strategy doesn’t require Amazon’s approval. No limits on warehouse allocations. No prep compliance headaches.
• Some products can only be sold through FBM. FBA will often reject hazmat items, perishables, some supplements and oversized products. FBM is the only way to sell these on Amazon.
• You can still get the Prime badge in some cases.  If you meet Amazon’s strict shipping and account health requirements, you can qualify for the Prime badge while still shipping yourself. It’s a tough one to qualify for but sellers who do get the conversion benefits of Prime without the FBA fees.

FBM Disadvantages

• No Default Prime Badge. FBM listings that are not SFP status do not carry the Prime badge. Customers find it slower and less reliable than competing FBA listings. That's a direct hit to your conversion rate and your Buy Box odds.
• You Handle All Customer Service. Customer complaints, refunds, returns processing, and disputes—they all come to you. If the customer is not happy, they call you, not Amazon. You need to reply fast and professionally or you will get poor ratings. This takes a lot of time and energy to handle.
• Returns Management Falls on You. When a customer returns an item, you’re responsible for that. You have to process the return, arrange return shipping and inspect the returned inventory. If the item is damaged, then you lose money. The operational burden increases as you scale.
• Scaling Requires Investment. If you want to do more volume, you need a bigger warehouse or a 3PL contract. Both need a capital outlay and running costs. FBM scaling is operationally demanding.
• Amazon’s Algorithm Punishes Slow Shipping. Amazon's algorithm values on-time delivery. Late shipping or high return rates can really kill your visibility fast.
• Cash Flow Strain. With FBA, Amazon pays the cost of fulfillment and deducts it from your payout. With FBM, you pay for shipping and handling up front, out of pocket, before you get paid, which can be difficult, especially during the holiday peak season.

FBA vs FBM: Side-by-Side Comparison

When FBA Is the Right Choice

FBA is the right choice for products that have a standard size and sell fast and build healthy margins.

This category includes beauty, electronics, supplements, and similar products. If you sell 50+ units per month with margins above 25% after referral, fulfillment, and storage fees, FBA can take the operation off your plate while you focus on PPC and inventory planning.

This approach is also the best option for sellers who don’t have a warehouse or are not ready yet to make such an investment. Seasonal brands can also benefit from FBA, as it can handle seasonal peaks and scale transparently.

Finally, if you are a brand whose conversion rate is driven by the Prime Badge, you should go with FBA. For price-competitive standard-sized products, the badge effect often outweighs the fees.

When FBM Is the Right Choice

For example, an item that weighs 20 pounds and sells for $40 might have an FBA fulfillment charge of $12 to $15. That’s why using a third-party logistics provider (3PL) for Fulfilled by Merchant (FBM) is more profitable and significantly cheaper.

FBM is also the best choice if products are slow-moving and have long-term storage fees. For example, a niche product with 5 units sold per month will cost more in storage than it makes in revenue. FBM lets you store inventory penalty-free.

If your brand is based on custom unboxing and packaging then FBM is the choice. Premium brands, luxury and DTC-hybrid models have the benefit of owning the customer experience.

If you already have a 3PL relationship with competitive shipping rates, FBM is a good idea, as you have made the infrastructure investment.

Finally, FBM is the only choice for products that Amazon will not accept, such as supplements, oversized items and hazardous items

Can You Use Both? FBA and FBM Together

Yes, actually, many sellers combine FBA and FBM together, and here are the strategies they use:

Strategy 1: Use FBA for Core SKUs, and FBM as Backup

You can run high-velocity products through FBA, and if the FBA stocks run out or Amazon has a shipping delay, your FBM stocks will keep the sales flowing and will protect your sales rank continuity. This is a strategy that works as insurance.

Strategy 2: Use FBA for Fast Movers, FBM for Slow Movers

It’s best to use FBA for products that are fast-moving and that have excellent margins, whereas you use FBM for slow movers. You need to optimize each SKU individually.

Strategy 3: Test on FBM, scale FBA.

When you have new SKUs, send them to FBM first to see if they sell well; if they do, move them to FBA. If they don’t sell well, you can save the cost of sending inventory to Amazon warehouses.

The hybrid approach is not a fallback option but rather a tactical play so the SKU profitability can be maximized while the operational risk can be minimized. This tactic is used deliberately by experienced sellers.

How Fulfillment Choice Affects Your PPC Strategy

How you fulfill impacts your conversion rate. The Prime badge on FBA listings typically converts 20-30% better than similar FBM listings for products with high competition. If you convert better, you get a lower cost per acquisition at the same bid price.

This is how it works in PPC: A campaign that has high CVR can get a lower ACoS at a higher bid than an FBM campaign. The Prime badge does most of the work, so your conversion becomes better and you can afford to bid more aggressively.

FBM campaigns face the opposite problem. To get placement, you need to bid higher to overcome the Prime disadvantage. Your CVR becomes lower, and your ACoS increases. Over time, this scenario makes it harder to scale FBM campaigns profitably on keywords that are competitive.

Your fulfillment method affects everything starting with margins, PPC efficiency and ranking velocity. If you want a senior Amazon team to audit and show you how your current setup is affecting your rates, get a free marketing plan from Olifant Digital.

Frequently Asked Questions

Can I switch from FBA to FBM, or vice versa?

Yes, and you should ask Amazon to send your inventory back before you list it as FBM when you switch to FBM.

If you’re transitioning from FBM to FBA, you will need to restock and ship new inventory to Amazon fulfillment centers. Timing is really important here for cash flow and likewise important for the continuity of ranking. So plan this transition carefully.

What is Seller Fulfilled Prime (SFP)?

Eligible FBM sellers can display the Prime badge. Sellers who are on SFP are required to ship all of their orders in one day and have low return rates and great account health. Few sellers qualify for this program, but those who do give a Prime conversion lift without paying for FBA.

Does FBA help with Amazon Buy Box?

Yes, the Amazon algorithm is weighted towards fulfillment reliability. FBM listings are less likely to win the Buy box, which is not the case with FBA listings; however, those FBM sellers who have good metrics and competitive prices can still win, especially on the lower-priced items.

‍