What is the purpose of an audit program?

The tax laws administered by the Illinois Department of Revenue require taxpayers to self-assess the tax amounts they owe. An audit program is essential in order to:

  • promote voluntary compliance,
  • deter tax evasion,
  • educate taxpayers so they can complete and file required tax returns properly,
  • collect deficiencies and delinquencies, and
  • facilitate refunds.

If you have additional inquiries, you may submit them to the Questions, Comments, or Request form.