When starting your Amazon wholesale business one of the first decisions you face is how to fulfil your orders. Should you use Fulfillment by Amazon (FBA) where Amazon stores and ships your products or Fulfilled by Merchant (FBM) where you handle storage and shipping yourself? This choice significantly impacts your costs margins Buy Box eligibility and how much time you spend running your business.

We are Brandhunterz Ltd — a UK registered wholesale sourcing company (Company No: 15342697) — and we recommend FBA to virtually every wholesale seller we work with. In this guide we explain exactly why while also being honest about the situations where FBM makes more sense.

What is FBA — Fulfillment by Amazon?

With FBA you send your wholesale stock to Amazon’s fulfilment centres and Amazon takes care of everything else. When a customer orders your product Amazon picks packs and ships it — usually with next day or two day Prime delivery. Amazon also handles all customer service and returns on your behalf.

You pay Amazon a fulfilment fee per unit sold plus monthly storage fees for the space your products occupy. In exchange you get access to Prime customers Buy Box eligibility and complete hands-off logistics management.

What is FBM — Fulfilled by Merchant?

With FBM you store your products yourself — at home in a rented storage unit or at a third party logistics provider. When a customer orders you receive the notification pack the product and ship it yourself or through your own courier. You handle all customer service and returns directly.

FBM has no Amazon storage or fulfilment fees but requires significantly more of your time and operational infrastructure especially as your business scales.

Complete FBA vs FBM Comparison

Factor	FBA	FBM
Prime Eligibility	Automatic	Must qualify separately
Buy Box Advantage	Strong advantage	Disadvantaged vs FBA
Storage Cost	Amazon fees apply	Your own cost
Fulfilment Cost	Amazon FBA fee per unit	Your own shipping cost
Customer Service	Amazon handles all	You handle all
Returns Handling	Amazon handles all	You handle all
Time Required	Minimal after shipment	Daily packing and shipping
Scalability	Highly scalable	Limited by your capacity
Delivery Speed	Next day Prime	Depends on your courier
Best For	Wholesale sellers	Large heavy products

7 Reasons FBA Wins for Wholesale Sellers

Reason 1 — Automatic Prime Badge

Every FBA listing automatically displays the Prime badge giving customers confidence in fast reliable delivery. Over 200 million Amazon Prime members worldwide actively filter for Prime products when shopping. Without the Prime badge your listing is invisible to a significant portion of Amazon’s most valuable customers.

Reason 2 — Buy Box Advantage

Amazon’s algorithm strongly favours FBA sellers in the Buy Box calculation. An FBA seller at a slightly higher price will often beat an FBM seller at a lower price because Amazon knows FBA orders are fulfilled with guaranteed speed and quality. For wholesale sellers sharing a listing with competitors this Buy Box advantage is enormous.

Reason 3 — Hands Off Operations

With FBA your only operational task is sending stock to Amazon. After that Amazon handles picking packing shipping customer service and returns automatically. This frees your time to focus entirely on what actually grows your business — product research supplier outreach and finding new wholesale opportunities.

Reason 4 — Unlimited Scalability

With FBM your business is limited by your personal capacity to pack and ship orders. Whether you sell 10 or 10,000 units per month FBA handles it all at the same cost per unit without requiring additional staff space or equipment from you. This scalability is one of the most powerful features of the FBA model.

Reason 5 — Account Health Protection

With FBM you are responsible for maintaining late shipment rates valid tracking rates and customer satisfaction metrics. One bad week — an illness a supplier delay or a courier problem — can devastate your metrics and harm your Buy Box eligibility. FBA removes all of these operational risks from your account health equation.

Reason 6 — Multi-Channel Potential

Amazon offers Multi-Channel Fulfilment (MCF) allowing you to use your FBA stock to fulfil orders from other channels — your own website eBay and other marketplaces. This turns your Amazon FBA inventory into a fulfilment network for your entire ecommerce operation.

Reason 7 — Easier Supplier Relationships

When you tell wholesale brands you are an Amazon FBA seller it signals professionalism and scale. Brands know FBA sellers operate at a higher level than individual sellers packing orders from their kitchen table. This professional positioning helps with wholesale account approvals — another advantage of using Keepa verified FBA research combined with professional outreach.

When FBM Makes Sense for Wholesale Sellers

Despite our strong recommendation for FBA there are specific situations where FBM is the smarter choice:

Situation 1 — Very Large or Heavy Products

FBA fees are based on product size and weight. For very large or heavy products the FBA fulfilment fee can become so high that it destroys your margins completely. If your product weighs over 5kg or is oversized FBM may give you better margins even without the Prime badge advantage.

Situation 2 — Testing a New Product

When testing a completely new wholesale product you may not want to commit to sending a full FBA shipment before knowing whether it sells. Starting FBM with a small quantity lets you validate demand before investing in FBA preparation and shipping costs.

Situation 3 — Hazmat or Restricted Products

Some products cannot be stored in Amazon FBA warehouses due to hazmat restrictions — certain beauty products containing alcohol batteries and some cleaning products. For these categories FBM may be the only option if you want to sell them on Amazon.

Situation 4 — FBA Stock Runs Out

When your FBA stock runs out before your replenishment arrives switching to FBM temporarily with stock at your location keeps your listing active and generating sales rather than going out of stock completely. Having an FBM backup is good practice for your top selling products.

FBA Cost Calculation — Is it Worth It?

The most common concern sellers have about FBA is the cost. Here is a real comparison showing FBA vs FBM costs for a typical small standard wholesale product:

Cost Item	FBA Cost	FBM Cost
Fulfilment per unit	£2.10 FBA fee	£2.50 to £4.00 postage
Storage per unit per month	£0.20 to £0.50	Your own space cost
Packaging materials	£0.10 to £0.30 (to Amazon)	£0.30 to £0.80 per order
Time cost per unit	Negligible	5 to 10 mins per order
Customer service time	Zero — Amazon handles	Significant ongoing time
Total true cost per unit	£2.40 to £2.90	£3.00 to £5.00+

How to Calculate Whether FBA is Profitable for Your Product

Use Helium 10 or the free Amazon FBA Revenue Calculator to calculate your exact FBA fees before committing to any wholesale order. Here is the formula:

The Hybrid Strategy — FBA and FBM Together

The most sophisticated wholesale sellers use both FBA and FBM simultaneously on the same listing — a hybrid approach that maximises sales and protects against stock-outs. Here is how it works:

• Primary listing — FBA with your main stock in Amazon warehouse
• Backup listing — FBM with a small quantity at your location
• When FBA stock runs out FBM listing keeps sales coming in
• FBA listing at regular price — FBM listing at slightly higher price
• Customers default to FBA Prime listing — FBM catches any overflow

Conclusion — FBA is the Clear Winner for Wholesale Sellers

For Amazon FBA wholesale sellers the choice between FBA and FBM is not really a debate. FBA wins on almost every metric that matters — Prime eligibility Buy Box advantage scalability time efficiency and account health protection.

The additional cost of FBA fees is more than offset by higher conversion rates from Prime customers better Buy Box rotation and the enormous time saving of letting Amazon handle all logistics and customer service.

Start with FBA from your very first wholesale order. Use our Brands Directory to find your first wholesale supplier and our Amazon FBA Wholesale Beginners Guide for the complete step by step system.