Ecommerce profit margins: Where online sellers lose money on margins

Online sellers lose margin in a handful of documented places, and every one of them is published in advance. Marketplace fee schedules take a set share of each sale, advertising programs take another slice, and a returned order reverses revenue while the sale-day costs stay paid. The stakes are large: the Census Bureau put e-commerce at 17.1 percent of total U.S. retail sales in the second quarter of 2026. None of these leaks is hidden. Each one appears in a fee schedule or an official release that a seller can read before listing a single item. Funding questions sit next door in how SBA loan programs set terms and odds, and more commerce coverage gathers in the business news section. The sections below walk the fee stack in order. How big is the online selling pool? The Census Bureau measures the market each quarter.

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