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35 ILCS 200/21-25

    (35 ILCS 200/21-25)
    Sec. 21-25. Due dates; accelerated billing in counties of 3,000,000 or more. Except as hereinafter provided and as provided in Section 21-40, in counties with 3,000,000 or more inhabitants in which the accelerated method of billing and paying taxes provided for in Section 21-30 is in effect, the estimated first installment of unpaid taxes shall be deemed delinquent and shall bear interest after March 1 and until paid or forfeited at the rate of (i) 1 1/2% per month or portion thereof if the unpaid taxes are for a tax year before 2023 or (ii) 0.75% per month, or portion thereof, if the unpaid taxes are for tax year 2023 or any tax year thereafter. For tax year 2010, the estimated first installment of unpaid taxes shall be deemed delinquent and shall bear interest after April 1 at the rate of 1.5% per month or portion thereof until paid or forfeited. For tax year 2022, the estimated first installment of unpaid taxes shall be deemed delinquent and shall bear interest after April 1, 2023 at the rate of 1.5% per month or portion thereof until paid or forfeited. For all tax years, the second installment of unpaid taxes shall be deemed delinquent and shall bear interest after August 1 annually at the same interest rate until paid or forfeited. Notwithstanding any other provision of law, if a taxpayer owes an arrearage of taxes due to an administrative error, and if the county collector sends a separate bill for that arrearage as provided in Section 14-41, then any part of the arrearage of taxes that remains unpaid on the day after the due date specified on that tax bill shall be deemed delinquent and shall bear interest after that date at the rate of (i) 1 1/2% per month, or portion thereof, if the unpaid taxes are for a tax year before 2023 or (ii) 0.75% per month, or portion thereof, if the unpaid taxes are for tax year 2023 or any tax year thereafter.
    If the county board elects by ordinance adopted prior to July 1 of a levy year to provide for taxes to be paid in 4 installments, each installment for that levy year and each subsequent year shall be deemed delinquent and shall begin to bear interest 30 days after the date specified by the ordinance for mailing bills, at the rate of 1 1/2% per month, or portion thereof, until paid or forfeited. If the unpaid taxes are for a tax year before 2023, then interest shall accrue at the rate of 1.5% per month, or portion thereof, until paid or forfeited. If the unpaid taxes are for tax year 2023 or any tax year thereafter, then interest shall accrue at the rate of 0.75% per month, or portion thereof, until paid or forfeited.
    Payment received by mail and postmarked on or before the required due date is not delinquent.
    Taxes levied on homestead property in which a member of the National Guard or reserves of the armed forces of the United States who was called to active duty on or after August 1, 1990, and who has an ownership interest, shall not be deemed delinquent and no interest shall accrue or be charged as a penalty on such taxes due and payable in 1991 or 1992 until one year after that member returns to civilian status.
    If an Illinois resident who is a member of the Illinois National Guard or a reserve component of the armed forces of the United States and who has an ownership interest in property taxed under this Act is called to active duty for deployment outside the continental United States and is on active duty on the due date of any installment of taxes due under this Act, he or she shall not be deemed delinquent in the payment of the installment and no interest shall accrue or be charged as a penalty on the installment until 180 days after that member returns to civilian status. To be deemed not delinquent in the payment of an installment of taxes and any interest on that installment, the reservist or guardsperson must make a reasonable effort to notify the county clerk and the county collector of his or her activation to active duty and must notify the county clerk and the county collector within 180 days after his or her deactivation and provide verification of the date of his or her deactivation. An installment of property taxes on the property of any reservist or guardsperson who fails to provide timely notice and verification of deactivation to the county clerk is subject to interest and penalties as delinquent taxes under this Code from the date of deactivation.
(Source: P.A. 102-1112, eff. 12-21-22; 103-555, eff. 1-1-24.)

35 ILCS 200/21-27

    (35 ILCS 200/21-27)
    Sec. 21-27. Waiver of interest penalty.
    (a) On the recommendation of the county treasurer, the county board may adopt a resolution under which an interest penalty for the delinquent payment of taxes for any year that otherwise would be imposed under Section 21-15, 21-20, or 21-25 shall be waived in the case of any person who meets all of the following criteria:
        (1) The person is determined eligible for a grant
    
under the Senior Citizens and Persons with Disabilities Property Tax Relief Act with respect to the taxes for that year.
        (2) The person requests, in writing, on a form
    
approved by the county treasurer, a waiver of the interest penalty, and the request is filed with the county treasurer on or before the first day of the month that an installment of taxes is due.
        (3) The person pays the installment of taxes due, in
    
full, on or before the third day of the month that the installment is due.
        (4) The county treasurer approves the request for a
    
waiver.
    (b) With respect to property that qualifies as a brownfield site under Section 58.2 of the Environmental Protection Act, the county board, upon the recommendation of the county treasurer, may adopt a resolution to waive an interest penalty for the delinquent payment of taxes for any year that otherwise would be imposed under Section 21-15, 21-20, or 21-25 if all of the following criteria are met:
        (1) the property has delinquent taxes and an
    
outstanding interest penalty and the amount of that interest penalty is so large as to, possibly, result in all of the taxes becoming uncollectible;
        (2) the property is part of a redevelopment plan of a
    
unit of local government and that unit of local government does not oppose the waiver of the interest penalty;
        (3) the redevelopment of the property will benefit
    
the public interest by remediating the brownfield contamination;
        (4) the taxpayer delivers to the county treasurer (i)
    
a written request for a waiver of the interest penalty, on a form approved by the county treasurer, and (ii) a copy of the redevelopment plan for the property;
        (5) the taxpayer pays, in full, the amount of up to
    
the amount of the first 2 installments of taxes due, to be held in escrow pending the approval of the waiver, and enters into an agreement with the county treasurer setting forth a schedule for the payment of any remaining taxes due; and
        (6) the county treasurer approves the request for a
    
waiver.
    (c) For the 2019 taxable year (payable in 2020) only, the county board of a county with fewer than 3,000,000 inhabitants may adopt an ordinance or resolution under which some or all of the interest penalty for the delinquent payment of any installment other than the final installment of taxes for the 2019 taxable year that otherwise would be imposed under Section 21-15, 21-20, or 21-25 shall be waived for all taxpayers in the county, for a period of (i) 120 days after the effective date of this amendatory Act of the 101st General Assembly or (ii) until the first day of the first month during which there is no longer a statewide COVID-19 public health emergency, as evidenced by an effective disaster declaration of the Governor covering all counties in the State.
(Source: P.A. 101-635, eff. 6-5-20.)

35 ILCS 200/21-30

    (35 ILCS 200/21-30)
    Sec. 21-30. Accelerated billing. Except as provided in this Section, Section 9-260, and Section 21-40, in counties with 3,000,000 or more inhabitants, by January 31 annually, estimated tax bills setting out the first installment of property taxes for the preceding year, payable in that year, shall be prepared and mailed. The first installment of taxes on the estimated tax bills shall be computed at (i) 50% of the total of each tax bill for the preceding year for taxes payable on or before December 31, 2009, and (ii) 55% of the total of each tax bill for the preceding year beginning with the first installment payable in 2010. If, prior to the preparation of the estimated tax bills, a certificate of error has been either approved by a court on or before November 30 of the preceding year or certified pursuant to Section 14-15 on or before November 30 of the preceding year, then the first installment of taxes on the estimated tax bills shall be computed at (i) 50% of the total taxes for the preceding year as corrected by the certificate of error for taxes payable on or before December 31, 2009, and (ii) 55% of the total taxes for the preceding year, as corrected by the certificate of error, beginning with the first installment payable in 2010. By June 30 annually, actual tax bills shall be prepared and mailed. These bills shall set out total taxes due and the amount of estimated taxes billed in the first installment, and shall state the balance of taxes due for that year as represented by the sum derived from subtracting the amount of the first installment from the total taxes due for that year.
    The county board may provide by ordinance, in counties with 3,000,000 or more inhabitants, for taxes to be paid in 4 installments. For the levy year for which the ordinance is first effective and each subsequent year, estimated tax bills setting out the first, second, and third installment of taxes for the preceding year, payable in that year, shall be prepared and mailed not later than the date specified by ordinance. Each installment on estimated tax bills shall be computed at 25% of the total of each tax bill for the preceding year. By the date specified in the ordinance, actual tax bills shall be prepared and mailed. These bills shall set out total taxes due and the amount of estimated taxes billed in the first, second, and third installments and shall state the balance of taxes due for that year as represented by the sum derived from subtracting the amount of the estimated installments from the total taxes due for that year.
    The county board of any county with less than 3,000,000 inhabitants may, by ordinance or resolution, adopt an accelerated method of tax billing. The county board may subsequently rescind the ordinance or resolution and revert to the method otherwise provided for in this Code.
(Source: P.A. 96-490, eff. 8-14-09.)

35 ILCS 200/21-35

    (35 ILCS 200/21-35)
    Sec. 21-35. Estimated billing in overlapping districts. In counties with less than 3,000,000 inhabitants, when the certified assessed valuations for that portion of overlapping taxing districts lying in another county for the preceding year have not been received by the county clerk by March 1, the county board, upon petition of the county clerk, may by resolution or ordinance adopted on or prior to April 1 of that year, adopt the estimated property tax billing system provided for in this Section for taxes for the preceding year. The resolution or ordinance shall be effective only for the year in which it is adopted.
    When authorized by the county board to use the estimated property tax billing system, the county clerk shall estimate the assessed valuations for the other counties in the overlapping taxing districts from which certified assessed valuations for the preceding year have not been received by March 1. The estimated assessed valuations shall, for purposes of computing the first installment tax billing in the current year, be treated in the same manner as certified assessed valuations. Where estimated assessed valuations are used, the first installment billing shall be prepared and mailed on or before May 1.
    The county clerk shall make adjustments in the assessments, based on the actual certified assessed valuations later received from the other counties, and such adjustments shall be included in the tax billings for the second installment. A county using the estimated billing system shall complete and mail the adjusted second installment tax billing on or before August 1.
(Source: P.A. 91-357, eff. 7-29-99.)