amazonfullfillmentcosts include a variety of charges such as monthly storage fees, order fulfillment fees, and additional service charges like returns processing or oversized item handling. These costs are deducted directly from seller earnings, making it essential to understand them when calculating profits. Sellers often underestimate long-term storage fees or seasonal surcharges, which can eat into margins. Utilizing tools and planning inventory properly helps minimize unnecessary charges. By fully understanding these fulfillment costs, sellers can protect their profitability and grow sustainably on Amazon.