Referral fee
A percentage of each sale (often around 15%) that Amazon takes for the sale itself.
FBA fulfillment fee
A per-unit fee for picking, packing and shipping, based on size and weight.
Storage fees
Monthly charges for the space your inventory uses in Amazon warehouses — higher in peak season.
Ad costs
PPC spend is not an Amazon fee, but it is a real cost per unit you must include in your margin.
💡 Add every fee before you price — a “cheap” product can still lose money.