The first step in the initiative and referendum process in Arizona is to form a political committee. For purposes of initiatives and referenda a political committee is any association or combination of persons that is organized, conducted or combined for the purpose of influencing the result of any election in support of or opposition to an initiative or referendum. A committee is formed by completing either a $500 Threshold Exemption Statement or a Political Committee Statement of Organization.
An “Application for Initiative or Referendum Petition Serial Number” is required to be filed with the Secretary of State no earlier than 24 months prior to and no later than four months before the general election that the proposed measure will be included on the ballot.
The number of signatures required for initiatives is outlined in the Arizona Constitution. An initiative to amend the Arizona Revised Statutes requires 10% of all votes cast for Governor at the last preceding election. An initiative to amend the Arizona Constitution requires 15% of all votes cast for Governor at the last preceding election. A referendum requires 5% of all votes cast for Governor at the last preceding election.
For all of the details, see Arizona’s handbook: Initiative, Referendum and Recall Made EZ.