The main differences between a sole proprietorship and a private limited company in Bangladesh are: 1. Ownership: A sole proprietorship is owned by a single individual, while a private limited company has multiple shareholders. 2. Liability: The owner of a sole proprietorship has unlimited liability, while shareholders of a private limited company have limited liability up to their investment. 3. Registration: A sole proprietorship has a simpler registration process compared to a private limited company. 4. Taxation: A sole proprietorship is taxed as an individual, while a private limited company is subject to corporate taxation. 5. Compliance: A sole proprietorship has fewer annual compliance requirements compared to a private limited company.