You might have to check with a lawyer to see if it is legal.  Many preschools are privately run and they can make up their own rules.  However, if the school is taking state or federal dollars, they might have certain rules they need to follow.  If they have grant money that says it is only to benefit specific socioeconomic groups, then the family income will plan a part in who is accepted into the program.

Barb K
www.LessonPop.com