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35 ILCS 5/202.5

    (35 ILCS 5/202.5)
    Sec. 202.5. Net income attributable to the period beginning prior to January 1 of any year and ending after December 31 of the preceding year.
    (a) In general. With respect to the taxable year of a taxpayer beginning prior to January 1 of any year and ending after December 31 of the preceding year, net income for the period after December 31 of the preceding year, is that amount that bears the same ratio to the taxpayer's net income for the entire taxable year as the number of days in that taxable year after December 31 bears to the total number of days in that taxable year, and the net income for the period prior to January 1 is that amount that bears the same ratio to the taxpayer's net income for the entire taxable year as the number of days in that taxable year prior to January 1 bears to the total number of days in that taxable year.
    (b) Election to attribute income and deduction items specifically to the respective portions of a taxable year prior to January 1 of any year and after December 31 of the preceding year. In the case of a taxpayer with a taxable year beginning prior to January 1 of any year and ending after December 31 of the preceding year, the taxpayer may elect, instead of the procedure established in subsection (a) of this Section, to determine net income on a specific accounting basis for the 2 portions of the taxable year:
        (1) from the beginning of the taxable year through
    
December 31; and
        (2) from January 1 through the end of the taxable
    
year.
    The election provided by this subsection must be made in form and manner that the Department requires by rule, and must be made no later than the due date (including any extensions thereof) for the filing of the return for the taxable year, and is irrevocable.
    (c) If the taxpayer elects specific accounting under subsection (b):
        (1) there shall be taken into account in computing
    
base income for each of the 2 portions of the taxable year only those items earned, received, paid, incurred or accrued in each such period;
        (2) for purposes of apportioning business income of
    
the taxpayer, the provisions in Article 3 shall be applied on the basis of the taxpayer's full taxable year, without regard to this Section;
        (3) the net loss carryforward deduction for the
    
taxable year under Section 207 may not exceed combined net income of both portions of the taxable year, and shall be used against the net income of the portion of the taxable year from the beginning of the taxable year through December 31 before any remaining amount is used against the net income of the latter portion of the taxable year.
(Source: P.A. 96-1496, eff. 1-13-11.)