(1) DEFINITIONS. In this section: (a) “Combined group” means the group of all persons whose income and apportionment factors are required to be taken into account under sub. (2) to determine a member’s share of the net business income or loss apportionable to this state that is attributable to a unitary business. (b) “Combined report” means a report in the form and manner prescribed by the department that specifies a combined group’s income from the unitary business, apportionment factors attributable to the unitary business, and any other tax return information prescribed by the department. (c) “Commonly controlled group” means any of the following: 1. A parent corporation and any one or more corporations or chains of corporations that are connected to the parent corporation by direct or indirect ownership by the parent corporation, if the parent corporation owns stock representing more than 50 percent of the voting power of at least one of the connected corporations or if the parent corporation or any of the connected corporations owns stock that cumulatively represents more than 50 percent of the voting power of each of the connected corporations. 2. Any 2 or more corporations if a common owner, regardless of whether the owner is a corporate entity, directly or indirectly owns stock representing more than 50 percent of the voting power of the corporations or connected corporations. 3. Any 2 or more corporations if stock representing more than 50 percent of the voting power in each corporation are interests that cannot be separately transferred. 4. Any 2 or more corporations if stock representing more than 50 percent of the voting power in each corporation is directly owned by, or for the benefit of, family members. In this subdivision, “family member” means an individual related by blood, marriage, or adoption within the 3rd degree of kinship, as computed under s. 990.001 (16), or the spouse of such individual. (d) “Consolidated foreign operating corporation” means a corporation that, for the taxable year, satisfies all of the following conditions: 1. It is a member of a unitary business. 2. It is included in the same federal consolidated return as at least one other corporation in that unitary business. 3. It has active foreign business income, as defined in section 861 (c) (1) B of the Internal Revenue Code, in an amount that is 80 percent or more of the corporation’s worldwide income. (e) “Corporation” means any corporation, as defined in s. 71.22 (1k), wherever located, which if it were doing business in this state would be subject to this chapter. “Corporation” does not include a tax-option corporation. (f) “Department” means the department of revenue. (g) “Doing business in this state” has the meaning given in s. 71.22 (1r). (h) “Domestic” means incorporated, organized, or created in the United States or under the laws of the United States or any state. (i) “File” has the meaning given in s. 71.22 (2m). (j) “Foreign” means not incorporated, organized, or created in the United States or under the laws of the United States or any state. (k) “Intangible expenses” has the meaning given in s. 71.22 (3g) for corporations taxable under this subchapter and the meaning given in s. 71.42 (1sg) for corporations taxable under subch. VII. (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. (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. (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 sepa- rate 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. (2) CORPORATIONS REQUIRED TO USE COMBINED REPORTING. (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). (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. (c) 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. 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. 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. (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: 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. 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. 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. 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. 5. The apportionment factor or factors attributable to the income described in subds. 1. to 4. (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. (f) 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. 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. 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. (2m) ELECTION TO INCLUDE EVERY MEMBER OF COMMONLY CONTROLLED GROUP. (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. (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. (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. (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. (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: (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. (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. (c) Its income from a business conducted wholly by the member entirely within the state. If a combined group consists only of corporations that are conducting business entirely within this state, sub. (4) (f) to (j) applies to those corporations. (d) Its income sourced to this state from the sale or exchange of capital assets, and from involuntary conversions, as determined under sub. (4) (i). (e) Its nonbusiness income or loss allocable to this state. (f) Its income that is realized from the purchase and subsequent sale or redemption of lottery prizes, if the winning tickets were originally bought in this state. (g) Its income or loss allocated or apportioned in an earlier year, required to be taken into account as state source income or loss during the taxable year, other than a net business loss carryforward. (h) Its net business loss carry-forward, as determined under sub. (6). (4) BUSINESS INCOME OF THE COMBINED GROUP. (a) The business income of a combined group is the sum of the income of each member of the combined group as determined under the Internal Revenue Code, as modified under s. 71.26 or 71.45, and except as provided under pars. (b) to (j). If a unitary business includes income from a pass-through entity, the pass-through entity income to be included in the total income of the combined group shall be the member of the combined group’s direct and indirect distributive share of the pass-through entity’s unitary business income. (b) 1. Subtract any apportionable income of a distinct business activity conducted within and outside the state wholly by the member, income from a business conducted wholly by the member entirely within this state, the member’s nonbusiness income, the member’s income realized from the purchase and subsequent sale or redemption of lottery prizes if the winning tickets were originally bought in this state, and its income allocated or apportioned in an earlier year required to be taken into account as state source income during the taxable year. 2. Add any apportionable expense or loss of a distinct business activity conducted within and outside the state wholly by the member, expense or loss from a business conducted wholly by the member entirely within this state, the member’s nonbusiness expense or loss, its loss allocated or apportioned in an earlier year required to be taken into account as state source loss during the taxable year, and its net business loss carry-forward. (c) For combined group members that are consolidated foreign operating corporations, include only the income described in sub. (2) (d) 2. to 4. A combined group may deduct expenses properly attributable to a consolidated foreign operating corporation’s income described in sub. (2) (d) 2. to 4., subject to ss. 71.30 (2) and (2m) and 71.80 (1) (b) and (1m). (d) The modifications provided under ss. 71.26 (2) (a) 7., 8., and 9. and 71.45 (2) (a) 16., 17., and 18. shall not apply with respect to interest expenses or intangible expenses paid, accrued, or incurred by a combined group member to or for the benefit of a consolidated foreign operating corporation. (f) Except as provided in sub. (2) (d) 3. and except if the modification under s. 71.26 (3) (j) applies, dividends paid by one combined group member to another shall be, to the extent that the dividends are paid out of the earnings and profits of the unitary business included in the combined report, whether in the current taxable year or in a prior taxable year, subtracted from the income of the recipient. This paragraph does not apply to dividends received from members of the unitary business that were not part of the combined group at the time that the dividends were paid. (g) Except as otherwise provided by rule, business income or loss from an intercompany transaction between members of the same combined group shall be deferred as provided under U.S. Treasury Regulation 1.1502-13. Upon the occurrence of any of the following events, deferred business income or loss resulting from an intercompany transaction between members of a combined group shall be included in the income of the seller and shall be apportioned as business income or loss recognized immediately before the event: 1. The object of the deferred intercompany transaction is resold by the buyer to an entity that is not a member of the combined group. 2. The object of the deferred intercompany transaction is resold by the buyer to an entity that is a member of the combined group for use outside the unitary business in which the buyer and seller are engaged. 3. The object of the deferred intercompany transaction is converted by the buyer or is otherwise transferred to a use outside the unitary business in which the buyer and seller are engaged. 4. The buyer and seller are no longer members of the same combined group, regardless of whether the members are in the same unitary business. (h) Limitations that apply to charitable contribution deductions shall be applied as provided under section 170 of the Internal Revenue Code in the manner prescribed by the department by rule, as provided under sub. (11). (i) Gain or loss from the sale or exchange of capital assets, property described by section 1231 (a) (3) of the Internal Revenue Code, and property subject to an involuntary conversion shall be determined as provided under sections 1211, 1222, and 1231 of the Internal Revenue Code in the manner prescribed by the department by rule, as provided under sub. (11). (j) Any expense of one member of the combined group that is directly or indirectly attributable to the nonbusiness or exempt income of another member of the unitary business shall be allocated to that other member of the unitary business as corresponding nonbusiness or exempt expense, as appropriate. (5) MEMBER’S SHARE OF BUSINESS INCOME OF THE COMBINED GROUP. (a) For purposes of this subsection, each member of a combined group is doing business in this state if any member of the combined group is doing business in this state and that business relates to the combined group’s unitary business. Except as provided in par. (b), a taxpayer’s share of the business income apportionable to this state of each combined group of which it is a member shall be the product of the business income of the combined group as determined under sub. (4) and the taxpayer’s modified sales factor from the combined group, determined as follows: 1. For a member that is subject to apportionment under s. 71.25 (9), the numerator of the modified sales factor includes the member’s sales associated with the combined group’s unitary business in this state. Sales under s. 71.25 (9) (b) 2m. and 3. and (c) shall be included in the numerator of the modified sales factor if no member of the combined group is within the jurisdiction of the destination state for income or franchise tax purposes. 2. For a member that is subject to apportionment using a receipts factor under the department’s rules pursuant to s. 71.25 (10), the numerator of the modified sales factor includes the member’s Wisconsin receipts associated with the combined group’s unitary business in this state, as provided by such rules. 3. For a member that is subject to apportionment under s. 71.45 (3), the numerator of the modified sales factor includes the member’s premiums that are associated with the combined group’s unitary business in this state. 4. The denominator of the modified sales factor shall include the denominator of the sales factor for each combined group member described in subd. 1., the denominator of the receipts factor for each combined group member described in subd. 2., and the denominator of the premiums factor for each combined group member described in subd. 3. 5. For a member that is required under the department’s rules to use an apportionment factor or factors other than the sales factor, receipts factor, or premiums factor, the numerator of the modified sales factor for such member is its Wisconsin apportionment percentage on a separate entity basis based on the rules prescribed by the department, multiplied by the member’s total sales, as defined in s. 71.25 (9) (e) and (f). The denominator of the modified sales factor for such member is the member’s total sales as defined in s. 71.25 (9) (e) and (f). 6. The numerator and denominator, described in subds. 1. to 5., shall include the sales, receipts, or premiums of pass-through entities that are owned directly or indirectly by a corporation in proportion to a ratio the numerator of which is the amount of the corporation’s distributive share of the pass-through entity’s unitary business income included in the income of the combined group under sub. (4) and the denominator of which is the amount of the pass-through entity’s total unitary business income. 7. The modified sales factor shall exclude transactions between members of the same combined group. 8. For purposes of determining the numerator of the modified sales factor or any apportionment factor or factors determined under par. (b), a taxpayer is considered to be within the jurisdiction for income or franchise tax purposes of any state in which any member of its combined group is within the jurisdiction for income or franchise tax purposes. (b) If 2 or more members of a combined group would in the absence of this section be required to use differing apportionment formulas from one another, and if the business income of the combined group derived from business transacted in this state of that combined group cannot be ascertained with reasonable certainty by use of the modified sales factor as provided in par. (a), the combined group may petition the department to use a different apportionment computation for the combined report. This paragraph does not apply if less than 30 percent of the business income of the combined group would in the absence of this section be required to be apportioned using a factor or factors other than a single sales factor, a single receipts factor, or a single premiums factor. The department shall deny the petition if the taxpayer cannot show, by clear and convincing evidence, that the apportionment methods described in this subsection do not clearly reflect the income of the unitary business attributable to this state. (6) CREDITS, NET BUSINESS LOSSES, AND POST-APPORTIONMENT DEDUCTIONS. (a) Except as provided in pars. (b), (bm), and (c) no tax credit, Wisconsin net business loss carry-forward, or other post-apportionment deduction earned by one member of the combined group, but not fully used by or allowed to that member, may be used in whole or in part by another member of the combined group or applied in whole or in part against the total income of the combined group. A member of a combined group may use a carry-forward of a credit, Wisconsin net business loss carry-forward, or other post-apportionment deduction otherwise allowable under s. 71.26 or 71.45, that was incurred by that same member in a taxable year beginning before January 1, 2009. (b) 1. Subject to the limitations provided under s. 71.26 (3) (n), for each taxable year that a corporation has a net business loss carry-forward, as provided under s. 71.26 (4) or 71.45 (4), that was computed on a combined report for a combined group’s unitary business for a taxable year beginning on or after January 1, 2009, the corporation may, after using such net business loss carry-forward to offset its own income for the taxable year, use any remaining net business loss carry-forward to offset the income of all other members of the combined group on a proportionate basis, to the extent such income is attributable to that same unitary business. 2. Unless otherwise provided by the department by rule, if the corporation may no longer be included in the combined group, as determined under this section, the corporation’s net business loss carry-forward shall be available only to that corporation. (bm) 1. In this paragraph, “pre-2009 net business loss carryforward” means a corporation’s total net Wisconsin business loss carry-forward computed under s. 71.26 (4) or 71.45 (4) as of the beginning of its first taxable year that begins after December 31, 2008, but not used by the corporation in any taxable year beginning before January 1, 2012. 2. Starting with the first taxable year beginning after December 31, 2011, and for each of the 19 subsequent taxable years, and subject to the limitations provided under s. 71.26 (3) (n), for each taxable year that a corporation that is a member of a combined group has pre-2009 net business loss carry-forward, the corporation may, after using the pre-2009 net business loss carry-forward to offset its own income for the taxable year, and after using shareable losses to offset its own income for the taxable year, as provided under par. (b) 1., use up to 5 percent of the pre-2009 net business loss carry-forward, until used or expired, to offset the Wisconsin income of all other members of the combined group on a proportionate basis, to the extent such income is attributable to the unitary business. If the full 5 percent of such pre-2009 net business loss carry-forward cannot be fully used to offset the Wisconsin income of all other members of the combined group, the remainder may be added to the portion that may offset the Wisconsin income of all other members of the combined group in a subsequent year, until it is completely used or expired, except that unused pre-2009 net business loss carry-forwards may not be used in any taxable year that begins after December 31, 2031. 3. Unless otherwise provided by the department by rule, if the corporation may no longer be included in the combined group, as determined under this section, the corporation’s pre2009 net business loss carry-forward shall be available only to that corporation. 4. The department shall promulgate rules to administer this paragraph. (c) 1. Subject to the limitations provided under s. 71.26 (3) (n), for each taxable year that a corporation that is a member of a combined group has an unused credit or credit carry-forward under s. 71.28 (4) or (5) or 71.47 (4) or (5), the corporation may, after using that credit or credit carry-forward to offset its own tax liability for the taxable year, use that credit or credit carry-forward to offset the tax liability of all other members of the combined group on a proportionate basis, to the extent such tax liability is attributable to the unitary business. 1. Subject to the limitations provided under s. 71.26 (3) (n), for each taxable year that a corporation that is a member of a combined group has an unused credit or credit carry-forward under s. 71.28 (4) or 71.47 (4), the corporation may, after using that credit or credit carry-forward to offset its own tax liability for the taxable year, use that credit or credit carry-forward to offset the tax liability of all other members of the combined group on a proportionate basis, to the extent such tax liability is attributable to the unitary business. 2. Unless otherwise provided by the department by rule, if the corporation may no longer be included in the combined group, as determined by this section, the corporation’s unused credits shall be available only to that corporation. (7) DESIGNATED AGENT. (a) Each combined group shall have one designated agent. Except as prescribed by the department by rule, the designated agent is the parent corporation of the combined group. If there is no such parent corporation, the designated agent may be appointed in the manner prescribed by the department. (b) Except as prescribed by the department, only the designated agent may act on behalf of the members of the combined group for matters relating to the combined report. The designated agent’s responsibilities include: 1. Filing a combined report under sub. (2) (a). 2. Filing any extension under s. 71.24 or 71.44. 3. Filing any amended combined reports or claims for refunds or credits. 4. Sending and receiving all correspondence with the department regarding the combined report. 5. Remitting all taxes, including estimated taxes, to the department. For purposes of computing interest on late payments, all payments remitted are deemed to be made on a pro rata basis by all members of the combined group, unless otherwise specified by the designated agent. 6. Participating on behalf of the combined group members in any investigation or hearing requested by the department regarding a combined report, producing all information requested by the department regarding the combined report, and filing any appeal related to the combined report, investigation, or hearing. Any appeal filed by the designated agent shall be considered to be filed by all members of the combined group. 7. Executing waivers, closing agreements, powers of attorney, and other documents as necessary or required regarding the combined report filed under sub. (2) (a). Any waiver, agreement, power of attorney, or document executed by the designated agent relating to a combined report shall be considered as executed by all members of the combined group, including any corporation not included in the combined report that the department asserts is a member of the combined group. 8. Receiving notices regarding the combined report. Any such notice the designated agent receives is considered received by all members of the combined group. 9. Receiving refunds relating to the combined report. Any such refund shall be paid to and in the name of the designated agent and shall discharge any liability of the state to any member of the combined group regarding the refund. 10. Other responsibilities as determined by rule by the department. (8) TAXABLE YEAR OF COMBINED GROUP. The combined group’s taxable year is determined as follows: (a) If 2 or more members of a combined group file a federal consolidated return, the combined group’s taxable year is the taxable year of the federal consolidated group. In all other cases, the taxable year is the taxable year of the designated agent under sub. (7). (b) If a taxable year of a member of a combined group differs from the taxable year of the combined group, the designated agent shall elect to determine the portion of that member’s income to be included in one of the following ways: 1. A separate income statement prepared from the books and records for the months included in the combined group’s taxable year. 2. Including all of the income for the year that ends during the combined group’s taxable year. (c) For corporations that are subject to an election under par. (b), the same election shall be made for each member of the combined group subject to the election, the same election shall be made in each succeeding year, and the election is irrevocable except upon written approval by the department. (9) PART-YEAR MEMBERS OF A COMBINED GROUP. If a corporation becomes a member of a combined group or ceases to be a member of a combined group after the beginning of the taxable year of the combined group, the corporation’s income shall be determined as provided under subs. (3), (4), and (5) for the portion of the year in which the corporation was a member of the combined group and that income shall be included in the combined report. The income for the remaining short period shall be reported on a separate return or separate combined report. (11) CONFORMITY WITH FEDERAL CONSOLIDATED RETURN REGULATIONS. The department may promulgate any rules necessary to create uniformity between the treatment of transactions entered into by members of a federal consolidated group under federal regulations, including any income, expense, gain, or loss limitations applicable to such transactions, and treatment of transactions entered into by members of a combined group under this section, including any income, expense, gain, or loss limitations applicable to such transactions.
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