Amazon FBA Seller Fees are the charges that Amazon applies to sellers using the Fulfillment by Amazon (FBA) service. These fees include storage fees, fulfillment fees for picking, packing, and shipping products, and other costs associated with handling returns and customer service. Seller fees are determined by factors such as the size and weight of the product, the time of year (as storage fees can be higher during peak seasons), and the number of units stored in Amazon’s fulfillment centers. Sellers must factor these fees into their pricing strategy to maintain profitability.