Check GuideStar.org to find executive compensation and other Form 990 information on nonprofit organizations. Free registration is required to access the basic database, but it is worth your time. GuideStar.org is a go-to source, now a part of Candid. Most tax-exempt nonprofits file a Form 990 with the IRS, which shows important financial information and executive compensation (or portion of executive comp) received from that organization. GuideStar reports the ability to search 1.8 million tax-exempt organizations, as well as thousands of faith-based nonprofits.