While it's possible to sell items online as an individual, operating without a formal business structure may limit your growth potential and expose you to legal risks. Selling casually on platforms such as eBay or Facebook Marketplace can be done without a registered business.    However, if you plan to scale your operations, accept multiple forms of payment or build a brand, it's advisable to establish a formal business entity. This not only provides legal protection but also enhances credibility with customers and suppliers.