71.255(1)(L) (L) “Interest expenses" has the meaning given in s. 71.22 (3m) for corporations taxable under this subchapter and the meaning given in s. 71.42 (1t) for corporations taxable under subch. VII.

71.255(1)(m) (m) “Pass-through entity" means a general or limited partnership, an organization of any kind treated as a partnership for tax purposes under this chapter, a tax-option corporation, a real estate investment trust, a regulated investment company, a real estate mortgage investment conduit, a financial asset securitization investment trust, a trust, or an estate.

71.255(1)(n) (n) “Unitary business" means a single economic enterprise that is made up either of separate parts of a single business entity, of multiple business entities that are related under section 267 or 1563 of the Internal Revenue Code, or of a commonly controlled group of business entities that are sufficiently interdependent, integrated, and interrelated through their activities so as to provide a synergy and mutual benefit that produces a sharing or exchange of value among them and a significant flow of value to the separate parts. Two or more business entities are presumed to be a unitary business if the businesses have unity of ownership, operation, and use as indicated by a centralized management or a centralized executive force; centralized purchasing, advertising, or accounting; intercorporate sales or leases; intercorporate services, including administrative, employee benefits, human resources, legal, financial, and cash management services; intercorporate debts; intercorporate use of proprietary materials; interlocking directorates; or interlocking corporate officers. In no event and under no circumstances shall the preceding sentence be construed as exclusive of any and all other factors indicative of a unitary business. For purposes of this section, the term “unitary business" shall be broadly construed, to the extent permitted by the U.S. Constitution. The members of a combined group shall be jointly and severally liable for costs, penalties, interests, and taxes associated with the combined report. Any business conducted by a pass-through entity that is owned directly or indirectly by a corporation shall be treated as conducted by the corporation, to the extent of the corporation's distributive share of the pass-through entity's income, regardless of the percentage of the corporation's ownership interest. A business conducted directly or indirectly by one corporation is unitary with that portion of a business conducted by another corporation through its direct or indirect interest in a pass-through entity if there is a synergy and exchange and flow of value between the 2 parts of the business and the 2 corporations are members of the same commonly controlled group.

71.255(2) (2) Corporations required to use combined reporting.

71.255(2)(a) (a) A corporation, not including a corporation of which all its income is exempt from taxation under s. 71.26 (1) or 71.45 (1), engaged in a unitary business with one or more other corporations in the same commonly controlled group shall report its share of income from that unitary business in the amount determined by a combined report filed by a designated agent of the unitary business, as determined under sub. (7). The combined report shall include the income, determined under sub. (3), and apportionment factor or factors determined under sub. (5), of every corporation in the commonly controlled group that is engaged in the unitary business, except as provided in pars. (b) to (f).

71.255(2)(b) (b) A foreign corporation that is a combined group member shall include in the combined report income that is derived only from sources within the United States as provided in sections 861 to 865 of the Internal Revenue Code. The foreign corporation shall include in the combined report its apportionment factor or factors related only to that income.

71.255(2)(c) (c)

71.255(2)(c)1. 1. Except as provided in par. (d), if 80 percent or more of a corporation's worldwide income is active foreign business income, the income and apportionment factor or factors of the corporation shall not be included in the combined report, but the corporation shall compute and allocate or apportion its income from the unitary business separately.

71.255(2)(c)2. 2. For purposes of subd. 1., “active foreign business income” means gross income derived from sources outside the United States, as determined in subchapter N of the Internal Revenue Code, including income of a subsidiary corporation, and attributable to the active conduct of a trade or business in a foreign country or in a U.S. possession.

71.255(2)(c)3. 3. For purposes of subd. 2., a corporation is considered a subsidiary if the parent corporation owns, directly or indirectly, stock with at least 50 percent of the total voting power of the corporation and the stock has a value equal to at least 50 percent of the total value of the stock of the corporation.

71.255(2)(d) (d) The combined report of the unitary business of which a consolidated foreign operating corporation is a member shall include, and the separate return filed by the consolidated foreign operating corporation shall exclude, the following amounts, to the extent that they are attributable to the unitary business:

71.255(2)(d)1. 1. An income amount equal to the interest expenses and intangible expenses that are paid, accrued, or incurred by any combined group member to or for the benefit of the consolidated foreign operating corporation, except to the extent such amounts constitute income to the consolidated foreign operating corporation from sources outside the United States under sections 861 to 865 of the Internal Revenue Code.

71.255(2)(d)2. 2. To the extent that the amounts were not included under subd. 1., interest income and income generated from intangible property received or accrued by the consolidated foreign operating corporation, except to the extent such amounts constitute income from sources outside the United States under sections 861 to 865 of the Internal Revenue Code. For purposes of this subdivision, income generated from intangible property includes income related to the direct or indirect acquisition, use, maintenance, management, ownership, sale, exchange, or any other disposition of intangible property; income from factoring transactions or discounting transactions; royalty, patent, technical, and copyright fees; licensing fees; and other similar income.

71.255(2)(d)3. 3. Dividends paid or accrued by a real estate investment trust to the consolidated foreign operating corporation, if the real estate investment trust is not a qualified real estate investment trust as defined in s. 71.22 (9ad) and the dividend income is from sources within the United States under sections 861 to 865 of the Internal Revenue Code.

71.255(2)(d)4. 4. Income of the consolidated foreign operating corporation that is equal to gains derived from the sale of real or personal property located in the United States.

71.255(2)(d)5. 5. The apportionment factor or factors attributable to the income described in subds. 1. to 4.

71.255(2)(e) (e) Except for the amounts in par. (d), a consolidated foreign operating corporation shall compute and allocate or apportion its income from the unitary business separately.

71.255(2)(f) (f)

71.255(2)(f)1. 1. The department may require that a combined report include the income and associated apportionment factor or factors of any person who is not otherwise included in a combined group under this subsection, but who is a member of a unitary business, in order to reflect proper apportionment of income of the entire unitary business. The department may require that a combined report include the income and associated apportionment factor or factors of persons that are not corporations.

71.255(2)(f)2. 2. If the department determines that the reported income or loss of a member of a combined group engaged in a unitary business with any person not otherwise included in the combined group under this subsection represents an avoidance or evasion of tax by the person or the combined group member, the department may require all or any part of the income or loss and associated apportionment factor or factors of the person be included in or excluded from the combined report for the unitary business or may require the use of a different apportionment factor or factors. The department may require that a combined report include or exclude the income or loss and associated apportionment factor or factors of persons that are not corporations.

71.255(2)(f)3. 3. The authority granted under this paragraph is in addition to, and not a limitation of or dependent on, the provisions in this chapter enacted to prevent tax avoidance or evasion or to clearly reflect the income of any person. Any determination by the department under this paragraph is presumed correct and the person challenging the determination has the burden of proving by clear and convincing evidence that the determination is incorrect.

71.255(2m) (2m) Election to include every member of commonly controlled group.

71.255(2m)(a) (a) The designated agent as provided in sub. (7) may elect, without first obtaining written approval from the department, to include in its combined group every corporation in its commonly controlled group, regardless of whether such corporations are engaged in the same unitary business as the designated agent. Corporations included in the combined group by operation of this election are required to use combined reporting only to the extent described in sub. (2). The commonly controlled group shall calculate its Wisconsin income and apportionment factors as provided under subs. (3), (4), and (5), and all income of all members of the commonly controlled group, whether or not such income would otherwise be subject to apportionment or allocable to a particular state in the absence of an election under this subsection, shall be treated as apportionable income for purposes of the combined report.

71.255(2m)(b) (b) The election under this subsection shall be executed by the designated agent on an original, timely filed combined report. Any corporation that becomes includable in the commonly controlled group subsequent to the year of election shall have waived any objection to its inclusion in the combined report.

71.255(2m)(c) (c) An election under this subsection shall be binding for and applicable to the taxable year for which it is made and for the next 9 taxable years. An election may be renewed for another 10 taxable years, without prior written approval from the department after it has been in effect for 10 taxable years. The renewal shall be made on an original, timely filed return for the first taxable year after the completion of a 10-year period for which an election under this subsection was in place. An election that is not renewed shall be revoked. In the case of a revocation, a new election under this subsection shall not be permitted in any of the immediately following 3 taxable years.

71.255(2m)(d) (d) The department may not disregard the tax effect of an election under this subsection, or disallow the election, with respect to any controlled group member or members for any year of the election period.

71.255(3) (3) Components of income subject to tax. Each member is responsible for tax based on its taxable income or loss apportioned or allocated to this state, including:

71.255(3)(a) (a) Its share of any business income apportionable to this state of each of the combined groups of which it is a member, as determined under subs. (4) and (5). For financial organizations, as defined in ss. 71.04 (8) (a) and 71.25 (10) (a), business income includes interest, dividends, and receipts from investments of any kind. For purposes of this section, a financial organization shall treat the expenses associated with an investment as business expenses.

71.255(3)(b) (b) Its share of any business income apportionable to this state of a distinct business activity conducted within and outside the state wholly by the member, as determined under s. 71.25 or 71.45.