IRS Form 990
From Guidelines & Principles
Form 990 is an annual reporting return that certain federally tax-exempt organizations must file with the IRS. It provides information on the filing organization's mission, programs, and finances.
Resources
NPCCNY: How to Read the IRS Form 990 & Find Out What it Means
Annual Exempt Organization Return: Who Must File
Annual Exempt Organization Returns: Notices and Schedules
Articles
Federal Filing Requirements for Nonprofits