MyDec Help
Paper-based Real Property Transfer Tax Declaration forms for Chicago, Cook County and State of Illinois are being replaced by MyDec. This help guide will assist users get started.

Tax Application and Affidavit Forms
Forms used to correspond with the Tax Division

Tax Audit Information
Information about tax audits conducted by the Tax Division of the Department of Finance

Tax Information - EN ESPANOL
Información sobre los impuestos de Chicago

Tax Information Bulletins
Information Bulletins regarding various tax issues

Tax List
List of taxes enforced by the Tax Division of the Department of Finance

Tax Reasonable Cause Guidelines for Penalty Waiver Requests
Reasonable Cause Standards to Abate Late and/or Failure to File Penalties

Tax Returns
List of Chicago business tax returns

Tax Rulings
List of tax rulings released by the Department of Finance

For additional parking information, please visit the Tax Collection and Enforcement division site