Wisconsin IA Packet is a series of electronic forms created by the Wisconsin Department of Revenue for filing and paying Wisconsin income taxes. The forms are available in a variety of formats, including paper, PDF, and online. The IA Packet includes individual income tax returns for residents, nonresidents, and part-year residents; estimated tax payments for individuals and businesses; forms for claiming credits and deductions; and instructions for filing and paying taxes. There are three types of Wisconsin IA Packet: Individual Income Tax, Business Income Tax, and Trust Tax.