Is a small business owner without employees a capitalist? If a man has a small business where he is the only employee or if he is self employed, that makes him a capitalist?

For example a freelance writer. Or a subsistence farmer that only produces enough to feed himself and his family. Or a subsistence farmer that makes a little income on top of feeding himself and his family. Is there an income threshold that makes them capitalist?
(Bowing to peer pressure) According to original Marxist theory, no, he is not. Here, the defining characteristic of a capitalist is that he appropriates (as "profits") the surplus value that is created during the production process by other people's labor (capital does not produce surplus value).  

Your freelancer or small business owner without employees appropriates only their own surplus value, created by their own labor. And it doesn't matter how large is their income, as long as they make it without employing other people as their employees.

According to some other theory? Well, somebody name the theory, and then we can clarify who is a capitalist and who is not, according to that other theory. Otherwise, it will be too much "personal opinion-based".