Selling Online

Amazon FBA: The Real Costs

The real costs of Amazon FBA: referral and fulfilment fees, storage and inbound costs, advertising, returns, prep costs and how to calculate margins.

Stacks of cardboard boxes ready for shipment in a small warehouse
Illustration: Online Buying & Selling / AI-generated.

Key takeaways

  • FBA fees include referral fees, fulfilment fees and storage, and they vary by size, weight and category.
  • Advertising, returns and slow-moving stock can wipe out margins.
  • Model the full landed cost per unit before ordering inventory.
On this page

Fulfilment by Amazon (FBA) lets you store products in Amazon’s warehouses while Amazon handles packing, shipping and customer service. It can unlock enormous reach, but the costs are more complicated than they look.

The main FBA costs

CostWhat it is
Referral feeA percentage of each sale, varying by category
Fulfilment feePer-unit fee for picking, packing and shipping, based on size and weight
Storage feesMonthly fees per unit of space, higher in peak season
Long-term or excess storageExtra charges for slow-moving stock
Inbound costsShipping and placement fees to get stock into warehouses
AdvertisingSponsored product ads, often essential for visibility
ReturnsReturn processing and unsellable returns

Costs outside Amazon

  • Product cost from your supplier
  • Freight, duties and customs
  • Prep, labelling and packaging
  • Photography and listing creation
  • Samples and quality checks
  • Software and tools

How to calculate your margin

  1. Start with the selling price.
  2. Subtract referral and fulfilment fees.
  3. Subtract storage, inbound and advertising per unit.
  4. Subtract your landed product cost.
  5. Allow for returns and a contingency.

If what’s left is thin, one bad month of advertising or returns can put you in the red.

Tips

  • Choose small, light, durable products with steady demand.
  • Avoid overstocking: storage fees punish slow sellers.
  • Test with a small order first.
  • Track advertising cost of sales closely.

FBA vs selling yourself

Selling via your own shipping or other marketplaces can suit bulky, slow-moving or unique items; see Etsy vs eBay vs Facebook Marketplace and shipping options for small sellers.

Frequently asked questions

Is Amazon FBA worth it?

It can be for the right products, but margins depend heavily on fees, advertising and inventory management.

How much do I need to start FBA?

It depends on product cost and order quantity. Many sellers start with a small test order.

What products work best for FBA?

Small, lightweight, durable items with consistent demand and room for healthy margins.

Sources

  1. Amazon Seller Central — FBA fees
  2. US Federal Trade Commission — business guidance

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