The Micro and Small Enterprises Act 2012 defines micro enterprises as a firm, trade, service, industry or a business activity whose annual turnover does not exceed Sh 500,000 and whose total employees are less than 10 people.
Unrealistic and restrictive as it is, and where as a good chunk of Small and Medium Enterprises are left outside the scope of this act, it is the only direct legal infrastructure targeted at SME support that I have come across.
