An individual must meet one of a number of criteria to be accredited.

• $1,000,000 in net worth, not including equity in the primary residence
• $200,000 in earnings by one member of the household for the past two consecutive years, with reason to expect that to continue in current year
• $300,000 in earnings by spouses in the household for the past two consecutive years, with reason to expect that to continue in current year

Source: https://www.sec.gov/education/capitalraising/building-blocks/accredited-investor