A political organization subject to section 527 is a party, committee, association, fund, or other organization (whether or not incorporated) organized and operated primarily for the purpose of directly or indirectly accepting contributions or making expenditures, or both, for an exempt function.
A political organization must be organized for the primary purpose of carrying on exempt function activities. A political organization's primary activities must be exempt function activities. A political organization may engage in activities that are not exempt function activities, but these may not be its primary activities.
To be exempt, a political organization must file a timely notice with the IRS that it is to be treated as a tax-exempt organization.