Charter schools are public schools. Like district public schools we are publicly funded by local, state and federal tax dollars based on enrollment.  The difference is that Charter Schools in Chicago receive roughly 25% less funding per pupil than Chicago Public Schools receives for its non-charter public schools.  Out of this lower funding amount, in addition to the typical costs of providing education (such as teacher salaries, books and supplies) we must  cover all of the costs of running a school such as facilities rental and maintenance, security, buses, counselors, etc.  Until our schools reach full enrollment, the revenue shortfall must be made up by donations from individuals, corporations and foundations.