Would you like a receipt? <a href=" http://www.buscadichos.com/binge-drinking-essays ">revising a essay</a> You have probably heard of 501(c)(3). That is the gold standard for exempt organizations, since it allows for tax exempt charitable deductions. Thanks to the IRS unrelenting campaign of terror against the Tea Party or its bumbling mismanagement, depending on your point of view, you are also now aware of 501(c)(4).  It is a reasonable and correct inference that there must be organizations exempt under 501(c)(1) and 501(c)(2).  But how high does it go ?  It goes to 501(c)(29) and then on to 501(d).  Everybody agrees that it is way too complicated, but just try to eliminate one of them and see what happens.