55 ILCS 5/5-38008
An annual tax of not to exceed .04%, or the rate limit in effect on July 1, 1967, whichever is greater, of the value, as equalized or assessed by the Department of Revenue, of all taxable property within each county which has established a public county library service may be assessed, levied and collected by that county in the manner provided for the assessment, levy and collection of other taxes for county purposes.
Such tax rate may be increased in excess of .04% but not in excess of .08% of the value, as equalized or assessed by the Department of Revenue under the following terms and conditions. Prior to the levy and collection of such a tax, the county board shall adopt a resolution authorizing the levy and collection of the tax at a rate not in excess of .08% of the value of all taxable property within the county as equalized or assessed by the Department of Revenue, and, within fifteen days after the adoption of such a resolution, it shall be published once in a newspaper published or having a general circulation in the county. The publication of the resolution shall include a notice of (1) the specific number of voters required to sign a petition requesting that the question of the adoption of the resolution be submitted to the electors of the county; (2) the time in which the petition must be filed; and (3) the date of the prospective referendum. The county clerk shall provide a petition form to any individual requesting one.
If no petition is filed in the office of the county clerk, as hereinafter provided in this Section, within 30 days after the publication of the resolution, or if all such petitions so filed are determined to be invalid or insufficient, the resolution shall be in effect. But, if within that 30 day period a petition is filed in the office of the county clerk, signed by electors numbering not less than 5% of the number of electors residing within the county, asking that the question of levying and collecting such tax be submitted to the electors of the county, the board shall certify that question to the proper election officials, who shall submit the question at an election in accordance with the general election law. If a majority of electors voting upon the question voted in favor of the levy and collection of the tax provided for, such county shall be authorized and empowered to levy and collect such tax annually, but if a majority of the electors voting upon the question are not in favor thereof, the resolution shall not take effect.
Such tax rate may be increased to not to exceed .20% of the value, as equalized or assessed by the Department of Revenue, if the voters in such county shall so determine by a majority of those voting upon the proposition at any regular election. The proposition shall be in substantially the following form:
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Shall the annual tax rate for county library purposes in ...... County be increased from not to YES exceed (insert present maximum ------------------------------------------------- rate) to not to exceed .20% of NO the assessed value of all taxable property within the county?
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Any such tax authorized by the voters shall not be included within any constitutional or statutory limitation for county purposes, but shall be excluded therefrom and be in addition thereto and in excess thereof. The foregoing limitations upon tax rates may be increased or decreased under the referendum provisions of the General Revenue Law of Illinois.
55 ILCS 5/5-38008