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35 ILCS 5/1001

    (35 ILCS 5/1001) (from Ch. 120, par. 10-1001)
    Sec. 1001. Failure to File Tax Returns.
    (a) Failure to file tax return. In case of failure to file any tax return required under this Act on the date prescribed therefor, (determined with regard to any extensions of time for filing) there shall be added as a penalty the amount prescribed by Section 3-3 of the Uniform Penalty and Interest Act.
    (b) Failure to disclose reportable transaction. Any taxpayer who fails to include on any return or statement any information with respect to a reportable transaction that is required under Section 501(b) of this Act to be included with such return or statement shall pay a penalty in the amount determined under this subsection. Such penalty shall be deemed assessed upon the date of filing of the return for the taxable year in which the taxpayer participates in the reportable transaction. A taxpayer shall not be considered to have complied with the requirements of Section 501(b) of this Act unless the disclosure statement filed with the Department includes all of the information required to be disclosed with respect to a reportable transaction pursuant to Section 6011 of the Internal Revenue Code, the regulations promulgated under that statute, and regulations promulgated by the Department under Section 501(b) of this Act.
        (1) Amount of penalty. Except as provided in
    
paragraph (2), the amount of the penalty under this subsection shall be $15,000 for each failure to comply with the requirements of Section 501(b).
        (2) Increase in penalty for listed transactions. In
    
the case of a failure to comply with the requirements of Section 501(b) with respect to a "listed transaction", the penalty under this subsection shall be $30,000 for each failure.
        (3) Authority to rescind penalty. The
    
Department may rescind all or any portion of any penalty imposed by this subsection with respect to any violation, if:
            (A) the violation is with respect to a reportable
        
transaction other than a listed transaction, and
            (B) rescinding the penalty would promote
        
compliance with the requirements of this Act and effective tax administration.
        A determination made under this subparagraph (3) may
    
be reviewed in any administrative or judicial proceeding.
        (4) Coordination with other penalties. The penalty
    
imposed by this subsection is in addition to any penalty imposed by this Act or the Uniform Penalty and Interest Act. The doubling of penalties and interest authorized by the Illinois Tax Delinquency Amnesty Act (P.A. 93-26) are not applicable to the reportable penalties under subsection (b).
    (c) The total penalty imposed under subsection (b) of this Section with respect to any taxable year shall not exceed 10% of the increase in net income (or reduction in Illinois net loss under Section 207 of this Act) that would result had the taxpayer not participated in any reportable transaction affecting its net income for such taxable year.
(Source: P.A. 95-707, eff. 1-11-08.)