delivered the opinion of the court:
Thе substantive issue in this case is whether a corporation with losses for Federal income tax purposes, but positive income from sources subject to the State but not the Federal tax, may offset those losses on its Illinois income tax return against the positive State income. For the reason explained below, we do not decide that issue.
Section 201(a) of the Illinois Income Tax Act (Ill. Rev. Stat. 1973, ch. 120, par. 2-201(a)) imposes a tax on “net income.” “Net income” is defined in section 202(a) (Ill. Rev. Stat. 1973, ch. 120, par. 2-202(a)) as “that portion of [taxpayer’s] base income for [the] year which is allocable to this State [rather than to other states],” minus a standard exemption which is defined in section 204 (Ill. Rev. Stat. 1973, ch. 120, par. 2-204). “Base income,” in turn, is defined for corporations by section 203(b) (Ill. Rev. Stat. 1973, ch. 120, pаr. 2-203(b)) as the taxpayer’s “taxable income for the taxable year” plus several items, including “interest * * * to the extent excluded from *** the computation of taxable income” (Ill. Rev. Stat. 1973, ch. 120, par. 2-203(b)(2)(A)), minus several other items including “[a]n amount equal to all amounts included in [taxable income] *** which are exempt from taxation by this State either by reason of its Constitution or by reason of the Constitution, treaties or statutes of the United States” (Ill. Rev. Stat. 1973, ch. 120, par. 2-203(b)(2)(F)). “Taxable income” is definеd by the Illinois Income Tax Act as “the amount of *** taxable income properly reportable for federal income tax purposes for the taxable year under the provisions of the Internal Revenue Code.” (Ill. Rev. Stat. 1973, ch. 120, par. 2-203(d)(1).) Thus for purposes of the Illinois income tax, “taxable income” does not mean income taxable by the State at all, but rather income taxable under the Federal income tax. It is in terms of this concept that “net income,” thе income on which Illinois levies its tax, is in part defined.
Specifically, the issue in this case is whether the taxpayer, Madison Park Bank, which in 1974 had a large overall lоss in terms of Federal taxable income but an even larger gain from municipal bonds, taxable only under the Illinois income tax, can enter a negative number аs its “taxable income” or whether the figure it must enter is “zero.” The taxpayer argues that a net loss for Federal income tax purposes should be enterеd as such for State income tax purposes in the year it is incurred. The Department of Revenue argues that the proper way to recognize such losses for State income tax purposes is to carry the loss back or forward on one’s Federal income tax return to another year, as contemplated by the Internal Revenue Code (26 U.S.C. sec. 172 (1976)), and then amend one’s State income tax return for that other year to reflect the smaller “taxable income” amount on the Federal return. The Department of Revenue also argued successfully in the appellate court that the taxpayer in this case had already done this and that the loss was therefore being used twice to reduce the taxpayer’s debt in violation of section 203(f) of the Illinois Incomе Tax Act, which prohibits double deductions of the same loss (Ill. Rev. Stat. 1973, ch. 120, par. 2-203(f)).
The hearing officer in the administrative proceeding ruled for the Department of Revenue and ordered the bank to list its 1974 Federal taxable income as “zero.” On administrative review, the circuit court of Peoria County summarily reversed the hеaring officer, and the Department of Revenue appealed. The appellate court held that the Illinois tax laws did not permit the same item оf loss to be deducted twice, but remanded the cause to the hearing officer with instructions to permit the bank to amend its 1974 return so as to allow recognition of the loss to the extent it had not already been carried back. (
The bank calls our attention to the fact that having previously carried back its entire 1974 loss to an earlier year, it has no current negative income to quarrel over in view of the appellate court’s ruling that the same deduction cannot be taken twice. The bank did not challenge that ruling and paid the entire amount in сontroversy ($6,268) without dispute shortly after the appellate court decision; it therefore urges that we dismiss this case as moot. We recognize that the issue urgеd upon us by the Department of Revenue for review is a disputed question which will determine the rights of the bank if in future tax years it sustains a Federal loss it cannot carry back to offset earlier years’ gains. However, we fail to find any present controversy between the litigants here. The Department of Revenue would have no greater present rights against the bank were it to receive the ruling it requests than if we were to dismiss without opinion and allow the appellate court ruling to stand. The bank has paid all the money it was ever alleged to have owed. Any judgment we could render would be “ ‘wholly ineffectual for want of a subject matter on which it could operate’ ” (La Salle National Bank v. City of Chicago (1954),
This court will not review cases merely to establish a precedent or guide future litigation. (In re Marriage of Wright (1982),
It is true that Illinois courts have occasionally found exceptions to the mootness doctrine. (People ex rel. Wallace v. Labrenz (1952),
The fact that this case became moot before we granted leave to appeal should not deter us from dismissing the case nоw. The United States Supreme Court in Brownlow v. Schwartz (1923),
We therefore dismiss this case. However, this disposition would leave standing the determination of the appellate court that taxpayers may offset Federal losses against current Illinois gains were we to do nothing more. We thus vacate the judgments of the appellate and circuit courts on this issue without comment as to the merits. See People ex rel. Newdelman v. Weaver (1972),
Judgments vacated; cause dismissed.
