Nonprofit organizations with 501(c)(3) status are required to file Form 990, Return of Organizations Exempt from Income Tax, with the IRS. The form includes financial statements and background information on the nonprofit, including salaries of key employees (i.e. director, head, officers).
Form 990 is filed by tax-exempt organizations with annual receipts of more than $100,000 or total assets more than $250,000 must file annually. Smaller nonprofits ( annual receipts of less than $100,000 but at least $25,000 and total assets less than $250,000) file a Form 990-EZ
Most religious organizations are not required to file annual information returns, nor are organizations whose gross receipts are less than $25,000 per year. The majority of recognized charities fall into one of these two groups. All other organizations are required to file an annual information return: