Introduction

Choosing how to fulfill your Amazon orders is more than a logistical decision. It directly impacts your margins, brand control, scalability, and customer experience. If you’re a new or growing Amazon seller, you’re likely weighing the two primary options: Fulfilled by Amazon (FBA) and Fulfilled by Merchant (FBM).

But with shifting fees, increasing competition, and Amazon’s changing policies in 2025, the choice isn’t as straightforward as it once was.

In this guide, we’ll break down the real-world pros and cons of FBA vs FBM, how the cost structures compare post-2023, and when it makes strategic sense to switch or combine both. Whether you’re launching your first product or scaling up, this article will help you make an informed decision, and avoid costly mistakes.

What Is FBA vs. FBM?

Let’s start with the basics:

• FBA (Fulfilled by Amazon): You send your inventory to Amazon’s warehouses. Amazon stores, picks, packs, ships, and handles customer service for each order.
• FBM (Fulfilled by Merchant): You (or your logistics provider) handle storage, packing, shipping, and customer service.

While the concept sounds simple, the implications on your business model, profitability, and scalability are massive.

Pros and Cons of Fulfilled by Merchant vs. FBA

Fulfilled by Amazon (FBA)

Pros:

• Prime eligibility, which boosts conversion rates
• Faster shipping and free returns attract more buyers
• Less operational burden (Amazon handles logistics)
• Higher Buy Box win rate, especially for new sellers

Cons:

• Storage and fulfillment fees can erode margins
• Less control over packaging and brand presentation
• Returns can be costly and harder to manage
• Risk of inventory stranded or lost in Amazon warehouses

Fulfilled by Merchant (FBM)

Pros:

• More control over logistics, branding, and customer experience
• Lower fulfillment costs for bulky or low-turnover products
• Avoid long-term storage fees and unplanned removals
• Better for multi-channel fulfillment

Cons:

• No automatic Prime eligibility (unless using Seller Fulfilled Prime)
• Requires managing shipping times and customer service
• Harder to win the Buy Box, especially for new listings
• Increased workload as order volume grows

Amazon FBA Fees vs. FBM Costs in 2025

Post-2023, Amazon has made notable changes to FBA fee structures. Seasonal surcharges, dimensional weight pricing, and stricter storage thresholds make understanding your costs more critical than ever.

FBA Costs:

• Monthly storage fees (standard & peak season rates)
• Fulfillment fees per unit (based on size and weight)
• Aged inventory surcharge (over 181 days)
• Removal and disposal fees

FBM Costs:

• Warehousing/storage (third-party or in-house)
• Packaging materials and labor
• Carrier shipping fees (FedEx, UPS, USPS)
• Customer service & returns processing

Pro Tip: Use tools like Helium 10 to calculate net margins for each SKU under both models.

Is Fulfilled by Amazon Worth It in 2025?

For many new brands, FBA remains the fastest way to build momentum, gain visibility, and earn customer trust. That said, it’s not always the most profitable, especially with Amazon’s rising fees.

FBA may be worth it if:

• You want to win the Buy Box quickly
• Your product is small, lightweight, and fast-moving
• You lack the infrastructure to handle fulfillment
• You prioritize scale and speed over operational control

FBM may be better if:

• Your margins are thin and every fee matters
• You sell custom, fragile, or heavy products
• You already have a solid fulfillment process or 3PL
• You want to control the customer experience end-to-end

Best Fulfillment Method for Amazon Prime Eligibility

FBA = automatic Prime badge. FBM = no Prime, unless you enroll in Seller Fulfilled Prime (SFP). However, SFP is now invite-only and requires strict delivery SLAs.

If you want to benefit from Amazon Prime traffic without losing margin to FBA fees, you could:

• Use FBA for fast-moving SKUs to gain Prime exposure
• Use FBM for slower, bulkier, or more complex products

This hybrid model gives you flexibility, control, and speed.

How to Switch from FBM to FBA on Amazon

Already using FBM but thinking about scaling with FBA? Here’s how to switch:

1. Create FBA offers for your ASINs in Seller Central
2. Convert listings from FBM to FBA (you can keep both offers active)
3. Send inventory to Amazon via a shipping plan
4. Adjust pricing to reflect new FBA fees
5. Monitor performance and inventory levels

Tip: Don’t go all-in at once. Test 1-2 SKUs through FBA, monitor conversion rates and fees, then scale gradually.

Should I Use FBA or FBM for Low-Margin Products?

If your product has tight margins, every fee matters. FBA can quickly erode profitability if:

• You face high return rates
• The item is oversized or low-priced
• Turnover is slow, incurring storage fees

In such cases, FBM or a fulfillment partner may be smarter. You control costs, avoid Amazon’s aging inventory fees, and have more pricing flexibility.

That said, you may still test FBA during peak seasons when sales velocity offsets the higher costs.

FBA vs. FBM for International Amazon Sellers

International sellers face additional considerations:

FBA Pros:

• Amazon handles import, VAT, and customs (if using Amazon Global Logistics)
• You can scale across marketplaces faster (Pan-EU, NARF)

FBA Cons:

• Complex VAT registration and compliance required
• Higher costs and risks if demand is unpredictable

FBM Pros:

• Use your existing logistics provider
• Greater control over customs, duties, and compliance

FBM Cons:

• Delivery times may hurt conversion and Prime eligibility
• Complex to manage returns from abroad

Pro Tip: For first-time international sellers, FBA may simplify your launch. Later, you can transition to FBM as you optimize logistics.

Hybrid Model: The Best of Both Worlds?

You don’t have to choose just one.

A hybrid FBA + FBM model allows you to:

• Test new products via FBM before committing to FBA
• Keep selling during FBA stockouts
• Use FBA for fast-movers, FBM for niche SKUs
• Avoid storage fees during slow seasons

This strategy offers resilience, flexibility, and margin control—especially useful for growing brands.

Q&A: Quick Answers to Common Fulfillment Questions

What’s the easiest option for new Amazon sellers?
FBA is typically easier to start with, especially if you don’t have your own logistics set up.

Can I use both FBA and FBM for the same product?
Yes. You can have both offers live and let Amazon rotate the Buy Box.

Will FBM hurt my sales compared to FBA?
It can—especially if you’re not Prime-eligible or offer slower shipping.

How do I know which fulfillment method is more profitable?
Use margin calculators and factor in storage, shipping, labor, and return costs for both.

Can I outsource FBM to a 3PL?
Absolutely. Many sellers use third-party logistics providers to fulfill FBM orders professionally.

Conclusion

FBA and FBM both offer unique strengths, and there is no one-size-fits-all answer. Your decision should reflect your brand’s current needs, product characteristics, and long-term strategy.

Want expert help applying these strategies to your brand? Book a call with our team.

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Affiliate Disclaimer

For keyword tracking, competitor research, and listing analysis, our preferred tool is Helium 10. As a Bits & Atoms partner, we recommend it for clients and readers seeking comprehensive Amazon insights. We offer 20% Off for 6 Months or 10% Off Every Month with our affiliate coupon.