Susan paints portraits of animals that she hangs in her home, an activity she characterizes as a hobby. Recently, a friend noticed the pictures and asked Susan to paint a portrait of her dog for which she paid Susan $750. 

How is the $750 payment treated for tax purposes?Susan paints portraits of animals that she hangs in her home, an activity she characterizes as a hobby. Recently, a friend noticed the pictures and asked Susan to paint a portrait of her dog for which she paid Susan $750. 

How is the $750 payment treated for tax purposes?