Michigan Integrated Tax Administration System - 271-0595-19

Description of Agency

The Department of Treasury and the Department of Technology, Management, and Budget (DTMB) implemented the Michigan Integrated Tax Administration System (MIITAS) in 2008 to process the new Michigan Business Tax (MBT). Since then, the following taxes have been added:

• Corporate income tax (CIT)
• Flow-through withholding (FTW)
• Sales, use, and withholding (SUW)
• City of Detroit individual income, withholding, and corporate income
• Essential services assessment (ESA)
• Medical marijuana facilities (MMF)

The SAP ECC software, using the Tax and Revenue Management (TRM) solution, provides the core tax processing functionality of MIITAS. There are approximately 800 State users and over 300,000 taxpayers that access the system. As of June 2019, the State spent $128,972,266 in development, enhancements, and ongoing support of MIITAS.

Audit Objectives

  1. To assess the effectiveness of selected security and access controls over MIITAS.

  2. To assess the sufficiency of selected tax processing controls within MIITAS.

  3. To assess the effectiveness of Treasury and DTMB’s change controls over MIITAS.


Estimated Release Date: February 2020

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