35 ILCS 515/6
Except as otherwise provided in this Section, within 60 days of receipt of each registration form, the county clerk or, in counties in which a county assessor is elected pursuant to Section 3-45 of the Property Tax Code, the county assessor shall compute the tax due, as provided in Section 3, and certify the tax to the county treasurer who shall mail the tax bill to the owner of such mobile home at the time he receives the certification or on the annual billing date, whichever occurs later. If the registration form is accompanied by a receipt for privilege taxes paid in Illinois for the current tax year, no further privilege tax shall be imposed for the remainder of the current tax year. If the mobile home is initially harbored after the annual liability date, as provided in Section 3 of this Act, the county clerk or county assessor shall reduce such tax 1/12 for each month that has passed since such annual liability date. A mobile home harbored after the first day of such month shall be considered to have been harbored for the entire month for the purposes of this Section. Thereafter, for taxable years prior to taxable year 2003, except for the year 1976, the county clerk or county assessor shall compute such tax as of the first day of June of each year and certify the tax to the county treasurer. For taxable year 2003 and thereafter, the county clerk or county assessor shall compute the tax as of the first day of March of each year and certify the tax to the county treasurer. Such tax shall be due and payable to the county treasurer within 60 days after the treasurer mails the tax bill to the address of record. The county treasurer shall distribute such taxes to the local taxing districts within the boundaries of which such mobile homes are located, in the same proportion as the property taxes collectible for each such taxing district in the prior year.
In order to effect the change of the annual billing date and the date of liability, provided for by this amendatory Act of 1975, the county clerk shall compute such tax as of July 1, 1976, for the 1/2 year period from July 1, 1976, through December 31, 1976, at 1/2 the amount of the annual tax. The tax for such period shall be certified, billed, collected and distributed in the same manner as is provided in this Section as taxes for a full year, and shall be subject to a proportionate reduction if the mobile home is initially harbored after July 1, 1976 and before January 1, 1977.
35 ILCS 515/6