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Special Investigation Unit
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Note: Confidential and personal information such as Social Security numbers, dates of birth or bank account numbers should not be transmitted via the department’s online form, as privacy cannot be protected or ensured due to the unsecured web form transmission. To include such information in tips about tax fraud, please complete the Tax Fraud Referral Form and mail it to P.O. Box 1737, SIU, Indianapolis, IN 46206.