Tax Exempt Status - Part 2

Historically, Leagues have qualified as tax exempt under 501(c)(4) as a "social welfare" organization.  Over the years, LWVUS, most state Leagues and larger local Leagues have formed a "sister" Education Fund entity which is qualified as tax exempt under 501(c)(3).  What are the basic tax differences between a (c)(3) and a (c)(4)?  A 501(c)(4) organization can support or oppose candidates for elected office and political parties, while a 501(c)(3) organization cannot. However, this difference is irrelevant for League organizations, as our own internal LWV rules prohibit this kind of political activity.  More on the differences next week.........