The True Cost of Amazon FBA: Fees Every Seller Should Know

FBA Isn't Free Fulfilment

Amazon FBA (Fulfilment by Amazon) handles storage, picking, packing, and shipping for you. It's incredibly convenient — but it comes at a cost. Many sellers underestimate the total fee burden, leading to products that look profitable on paper but lose money in practice.

The Main FBA Fees

Referral Fee

Amazon charges a percentage of each sale as a commission. This varies by category but is typically 8–15% of the selling price. Most standard categories are 15%.

Fulfilment Fee

A per-unit fee covering picking, packing, and shipping to the customer. This depends on the product's size and weight. Small, lightweight items have lower fees; oversized products pay significantly more.

Amazon publishes fee schedules that are updated periodically. Always check the current rates for your specific marketplace (US, UK, EU, etc.), as they differ.

Storage Fees

Monthly storage fees are charged per cubic foot (or cubic metre) of space your inventory occupies. Standard rates apply most of the year, but peak season surcharges (typically Q4 / October–December) can be significantly higher.

Long-Term Storage Fees

Inventory sitting in Amazon's warehouses beyond a certain period incurs additional surcharges. These penalties encourage sellers to maintain healthy sell-through rates.

Often-Overlooked Fees

Returns Processing

For categories with free returns, Amazon may charge a returns processing fee when a customer sends an item back. You lose the referral fee on the refunded sale and may also lose the product if it's not resellable.

Removal and Disposal Fees

If you need to remove unsold inventory from FBA warehouses, Amazon charges per-unit fees. Disposal fees apply if you want Amazon to discard the inventory instead.

Inbound Placement Fees

Amazon may charge fees if you want your inventory sent to a single fulfilment centre rather than being distributed across multiple locations.

Advertising Costs

While not technically an FBA fee, most sellers need to spend on Amazon PPC (Pay-Per-Click) advertising to gain visibility. This can add 10–25% to your effective cost per sale.

Calculating True Profitability

To know if a product is actually profitable on Amazon, your calculation should be:

Selling Price

• minus Referral Fee
• minus FBA Fulfilment Fee
• minus Monthly Storage (allocated per unit)
• minus Advertising Cost Per Sale
• minus Landed Cost Per Unit
• minus Returns Cost (estimated at your category's return rate) = Net Profit Per Unit

Example Calculation

For a product selling at $25.00:

That's a workable margin — but notice how a product with a $25 selling price and $8 landed cost appears to have 68% gross margin, while the actual net profit after all Amazon fees is just 18%.

Tips for Maximising FBA Profitability

1. Calculate fees before sourcing — use Amazon's fee calculators to model profitability before committing to a product
2. Optimise packaging size — smaller, lighter packaging reduces fulfilment fees
3. Monitor storage — remove slow-moving inventory before long-term fees kick in
4. Track your advertising spend — set clear ACoS (Advertising Cost of Sale) targets
5. Factor in returns — build your category's typical return rate into your calculations

The sellers who succeed on Amazon are the ones who understand every cost component and price accordingly.