1. The FBA vs FBM Debate
2. Why FBA Is the Default
3. When FBM Makes Sense
4. The Decision Framework
5. The Hybrid Approach
6. Making the Call
The Amazon FBA vs FBM question is not a simple one. And anyone who gives you a one-size-fits-all answer is either lazy or trying to sell you something.
At Marknology, we have managed fulfillment strategy for over 300 brands. Some are 100% FBA. Some are hybrid. A few are mostly FBM. The right answer depends on your product, your margins, and your growth goals.
The FBA vs FBM Debate
Quick definitions for anyone new:
- FBA (Fulfillment by Amazon): You ship inventory to Amazon's warehouses. They store it, ship it, handle returns, and provide Prime eligibility.
- FBM (Fulfilled by Merchant): You store and ship products yourself (or through a 3PL). You handle customer service and returns.
Why FBA Is the Default
For most brands, FBA is the right starting point. Here is why:
On the Startup Hustle podcast, Paul Robinson, an Amazon-focused attorney, talked about what FBA meant for the seller community:
"The game changer in our career, in our business was FBA. FBA is what took us from 100,000 to a million to 2 million. It was that ability to scale, to add scale at almost no cost."
FBA gives you:
- Prime badge. This alone can increase conversion rates by 25% or more. Prime members buy from Prime listings. Period.
- Buy Box advantage. FBA sellers win the Buy Box far more often than FBM sellers at the same price point.
- Hands-off logistics. No warehouse to manage. No shipping labels to print. No customer service calls about where their package is.
- Organic ranking boost. Amazon's algorithm favors FBA products because they deliver a better customer experience.
- Multi-channel fulfillment. You can even use FBA to fulfill orders from your own website.
When FBM Makes Sense
FBM is not dead. It is the right choice in specific situations:
- Oversized or heavy products. FBA fees for large items can destroy margins. If your product weighs 50 pounds, do the math carefully.
- Customized products. If you personalize, engrave, or build-to-order, FBA does not work.
- Slow-moving inventory. FBA long-term storage fees punish products that sit. If your product sells 10 units a month, those storage fees add up fast.
- You already have warehouse infrastructure. If you are fulfilling retail and DTC orders from a warehouse, adding Amazon FBM is incremental cost.
- Testing new products. Before committing to FBA inventory, test demand with FBM first.
The Decision Framework
Here is how we evaluate FBA vs FBM for every brand we onboard at Marknology:
Step 1: Calculate true FBA cost per unit
FBA fees include fulfillment fee, monthly storage, long-term storage (if applicable), and return processing. Add them all up and compare to your FBM cost (warehouse, shipping, labor, returns).
Step 2: Factor in the Prime conversion lift
If FBA costs $3 more per unit but your conversion rate doubles, you are making more money with FBA even at a higher cost per unit. Volume matters.
Step 3: Consider your product velocity
High-velocity products (50+ units per day) are perfect for FBA. The inventory turns fast, storage fees are minimal, and you get the Prime advantage. Low-velocity products need careful math.
Step 4: Evaluate your supply chain resilience
FBA has inventory limits. If you cannot keep product in stock at Amazon warehouses, you lose rank, lose the Buy Box, and lose momentum. Do you have a 3PL that can replenish quickly? If not, FBM or hybrid might give you more control.
The Hybrid Approach
Many of the brands we manage use both:
- FBA for your core catalog. Best sellers with consistent demand.
- FBM as a backup. If FBA goes out of stock, the FBM listing catches sales while you replenish. This prevents the dreaded stockout rank crash.
- FBM for heavy/oversized items. Where FBA fees do not pencil out.
- FBM for new product tests. Validate demand before committing to FBA.
Making the Call
The right fulfillment strategy is not about ideology. It is about math and customer experience. Run the numbers. Test both. Let the data decide.
For more fulfillment and logistics insights, visit our Media Hub and learn about how Marknology helps brands scale.
Not sure which fulfillment model is right for your brand? Book a free strategy call with Marknology. We will run the numbers with you and build a fulfillment strategy that maximizes profit.