(805 ILCS 5/15.75) (from Ch. 32, par. 15.75)
    Sec. 15.75. Rate of franchise taxes payable by foreign corporations.
    (a) The annual franchise tax payable by each foreign corporation shall be computed at the rate of 1/12 of 1/10 of 1% for each calendar month or fraction thereof for the period commencing on the first day of July 1983 to the first day of the anniversary month in 1984, but in no event shall the amount of the annual franchise tax be less than $2.083333 per month based on a minimum of $25 per annum or more than $83,333.333333 per month; commencing on January 1, 1984 to the first day of the anniversary month in 2004, the annual franchise tax payable by each foreign corporation shall be computed at the rate of 1/10 of 1% for the 12-months' period commencing on the first day of the anniversary month or, in the case of a corporation that has established an extended filing month, the extended filing month of the corporation, but in no event shall the amount of the annual franchise tax be less than $25 nor more than $1,000,000 per annum; commencing on January 1, 2004, the annual franchise tax payable by each foreign corporation shall be computed at the rate of 1/10 of 1% for the 12-month period commencing on the first day of the anniversary month or, in the case of a corporation that has established an extended filing month, the extended filing month of the corporation, but in no event shall the amount of the annual franchise tax be less than $25 nor more than $2,000,000 per annum.
    (b) The annual franchise tax payable by each foreign corporation at the time of filing a statement of election and interim annual report in connection with an anniversary month prior to January, 2004 shall be computed at the rate of 1/10 of 1% for the 12 month period commencing on the first day of the anniversary month of the corporation next following the filing, but in no event shall the amount of the annual franchise tax be less than $25 nor more than $1,000,000 per annum; commencing with the first anniversary month that occurs after December, 2003, the annual franchise tax payable by each foreign corporation at the time of filing a statement of election and interim annual report shall be computed at the rate of 1/10 of 1% for the 12-month period commencing on the first day of the anniversary month of the corporation next following such filing, but in no event shall the amount of the annual franchise tax be less than $25 nor more than $2,000,000 per annum.
    (c) The annual franchise tax payable at the time of filing the final transition annual report in connection with an anniversary month prior to January, 2004 shall be an amount equal to (i) 1/12 of 1/10 of 1% per month of the proportion of paid-in capital represented in this State as shown in the final transition annual report multiplied by (ii) the number of months commencing with the anniversary month next following the filing of the statement of election until, but excluding, the second extended filing month, less the annual franchise tax theretofore paid at the time of filing the statement of election, but in no event shall the amount of the annual franchise tax be less than $2.083333 per month based on a minimum of $25 per annum or more than $83,333.333333 per month; commencing with the first anniversary month that occurs after December, 2003, the annual franchise tax payable at the time of filing the final transition annual report shall be an amount equal to (i) 1/12 of 1/10 of 1% per month of the proportion of paid-in capital represented in this State as shown in the final transition annual report multiplied by (ii) the number of months commencing with the anniversary month next following the filing of the statement of election until, but excluding, the second extended filing month, less the annual franchise tax theretofore paid at the time of filing the statement of election, but in no event shall the amount of the annual franchise tax be less than $2.083333 per month based on a minimum of $25 per annum or more than $166,666.666666 per month.
    (d) The initial franchise tax payable after January 1, 1983, but prior to January 1, 1991, by each foreign corporation shall be computed at the rate of 1/10 of 1% for the 12 months' period commencing on the first day of the anniversary month in which the application for authority is filed by the corporation under Section 13.15 of this Act, but in no event shall the franchise tax be less than $25 nor more than $1,000,000 per annum. Except in the case of a foreign corporation that has begun transacting business in Illinois prior to January 1, 1991, the initial franchise tax payable on or after January 1, 1991, by each foreign corporation, shall be computed at the rate of 15/100 of 1% for the 12-month period commencing on the first day of the anniversary month in which the application for authority is filed by the corporation under Section 13.15 of this Act, but in no event shall the franchise tax for a taxable year commencing prior to January 1, 2004 be less than $25 nor more than $1,000,000 per annum plus 1/20 of 1% of the basis therefor and in no event shall the franchise tax for a taxable year commencing on or after January 1, 2004 be less than $25 or more than $2,000,000 per annum plus 1/20 of 1% of the basis therefor.
    (e) Whenever the application for authority indicates that the corporation commenced transacting business:
        (1) prior to January 1, 1991, the initial franchise
    
tax shall be computed at the rate of 1/12 of 1/10 of 1% for each calendar month; or
        (2) after December 31, 1990, the initial franchise
    
tax shall be computed at the rate of 1/12 of 15/100 of 1% for each calendar month.
    (f) Each additional franchise tax payable by each foreign corporation for the period beginning January 1, 1983 through December 31, 1983 shall be computed at the rate of 1/12 of 1/10 of 1% for each calendar month or fraction thereof between the date of each respective increase in its paid-in capital and its anniversary month in 1984; thereafter until the last day of the month that is both after December 31, 1990 and the third month immediately preceding the anniversary month in 1991, each additional franchise tax payable by each foreign corporation shall be computed at the rate of 1/12 of 1/10 of 1% for each calendar month, or fraction thereof, between the date of each respective increase in its paid-in capital and its next anniversary month; however, if the increase occurs within the 2 month period immediately preceding the anniversary month, the tax shall be computed to the anniversary month of the next succeeding calendar year. Commencing with increases in paid-in capital that occur subsequent to both December 31, 1990 and the last day of the third month immediately preceding the anniversary month in 1991, the additional franchise tax payable by a foreign corporation shall be computed at the rate of 15/100 of 1%.
(Source: P.A. 98-756, eff. 7-16-14.)