This chapter discusses various general-purpose legal forms for carrying on business. It starts with the simplest form of all, sole proprietorship (or self-employment). Two or more persons carrying on a business or profession in common with a view of profit are in partnership, which has developed into the sophisticated form of the limited liability partnership. The rest of the chapter is devoted to the various lesser used forms of company which can be registered under the Companies Act 2006 (CA 2006). These are guarantee companies, unlimited companies and community interest companies. The chapter also discusses how re-registration can be used to transform various types of company into other types.