According to the Small Business Administration (SBA), most manufacturing companies with 500 employees or fewer, and most non-manufacturing businesses with average annual receipts under $7.5 million are classified as small businesses.
Based on the SBA, there are 33.2 million small businesses in US which account for 99.9% of all U.S. firms. 85.8% of small businesses are one-person businesses without a single employee, and 55% are home-based businesses.