According to a new report GuideStar, salaries for women continue to lag behind men in comparable positions at nonprofits of all sizes. The gap is most significant for female chief executives at organizations with budgets of $2.5 million to $5 million. Their median salary was 23% less ($111,183) than that of their male peers ($136,882). Women execs fared best at organizations with budgets of less than $250,000, making 6% less ($42,105) than their male counterparts ($44,592). The report is based on 2013 IRS filings by approximately 105,000 not-for-profits.