75 ILCS 5/3-9
For the purpose of providing money to establish and replenish a local library working cash fund authorized by Section 4-13, corporate authorities shall have the power to levy, upon all the taxable property of a city, village, incorporated town or township, a tax not to exceed .05% of the value, as equalized or assessed by the Department of Revenue for the year in which the levy is made. The tax shall be levied and collected in like manner with other general taxes of the city, village, incorporated town or township but the collection of the tax shall not be anticipated by the issuance of any warrants drawn against the tax. The tax shall be known as the local library working cash fund tax and shall be set apart in a special fund as prescribed in Section 4-13. Whenever a tax is first levied under this Section, any taxpayer in the city, village, incorporated town or township may, within 30 days after the levy is made, file with the corporate authorities a petition signed by voters of the city, village, incorporated town or township equal in number to 10% or more of the registered voters of the city, village, incorporated town or township requesting the submission of a proposition to the voters of the city, village, incorporated town or township at an election in accordance with the general election law. The corporate authority shall certify the proposition to the proper election officials, who shall submit the proposition to the voters at an election in accordance with the general election law. If a majority of the votes cast upon the proposition are in favor thereof the tax shall thereafter be authorized; if a majority of the votes cast upon the proposition are against the proposition the tax shall not be levied.
No municipality or township may levy a tax under this Section for more than four years but the four years for which any municipality or township elects to levy such tax need not be consecutive.
75 ILCS 5/3-9