Publication 557 Tax-Exempt Status for Your Organization is FREE courtesy of the IRS
This is a key publication that everyone involved in the operations of a nonprofit should know, especially those people interested in starting a nonprofit. Publication 557 covers a wide variety of important nonprofit topics, from application procedures to filing requirements to specific tax issues and more.
Of special interest to some are the different nonprofit registration types. You will find that the most popular, the 501(c)(3) is covered in Chapter 3, starting on page 22. However, there are more than two dozen more classifications, which you can find in Chapter 4, page 47. Our Content Expert, Givebutter, summarizes the information on the types of nonprofits in a blog post, here.