Amendment SA15-SSA1-SB44

SB44-SSA1-SA15,6,5 71.04 (8) (c) The net business income of railroads, sleeping car companies, car line companies, pipeline companies, financial organizations, air carriers, and public utilities requiring apportionment shall be apportioned pursuant to rules of the department of revenue, but the income taxed is limited to the income derived from business transacted and property located within the state.

SB44-SSA1-SA15, s. 1580ep Section 1580ep. 71.04 (10) of the statutes is amended to read:

SB44-SSA1-SA15,6,17 71.04 (10) Department may waive factor. Where, in the case of any nonresident individual or nonresident estate or trust engaged in business within in and without the outside of this state of Wisconsin and required to apportion its income as provided in this section, it shall be shown to the satisfaction of the department of revenue that the use of any one of the 3 factors provided under sub. (4) gives an unreasonable or inequitable final average ratio because of the fact that such nonresident individual or nonresident estate or trust does not employ, to any appreciable extent in its trade or business in producing the income taxed, the factors made use of in obtaining such ratio, this factor may, with the approval of the department of revenue, be omitted in obtaining the final average ratio which is to be applied to the remaining net income. This subsection does not apply to taxable years beginning after December 31, 2005.".

SB44-SSA1-SA15,6,18 2. Page 633, line 4: after that line insert:

SB44-SSA1-SA15,6,20 " Section 1582dpb. 71.25 (6) of the statutes is renumbered 71.25 (6) (intro.) and amended to read:

SB44-SSA1-SA15,7,16 71.25 (6) Allocation and separate accounting and apportionment formula. (intro.) Corporations engaged in business within and without the state shall be taxed only on such income as is derived from business transacted and property located within the state. The amount of such income attributable to Wisconsin may be determined by an allocation and separate accounting thereof, when the business of such corporation within the state is not an integral part of a unitary business, but the department of revenue may permit an allocation and separate accounting in any case in which it is satisfied that the use of such method will properly reflect the income taxable by this state. In all cases in which allocation and separate accounting is not permissible, the determination shall be made in the following manner: for all businesses except air carriers, financial organizations, pipeline companies, public utilities, railroads, sleeping car companies, car line companies and corporations or associations that are subject to a tax on unrelated business income under s. 71.26 (1) (a) there shall first be deducted from the total net income of the taxpayer the part thereof (less related expenses, if any) that follows the situs of the property or the residence of the recipient. The remaining net income shall be apportioned to Wisconsin this state by use of an apportionment fraction composed of a sales factor under sub. (9) representing 50% of the fraction, a property factor under sub. (7) representing 25% of the fraction and a payroll factor under sub. (8) representing 25% of the fraction. the following:

SB44-SSA1-SA15, s. 1582dpc Section 1582dpc. 71.25 (6) (a) of the statutes is created to read:

SB44-SSA1-SA15,7,21 71.25 (6) (a) For taxable years beginning before January 1, 2004, an apportionment fraction composed of a sales factor under sub. (9) representing 50% of the fraction, a property factor under sub. (7) representing 25% of the fraction, and a payroll factor under sub. (8) representing 25% of the fraction.

SB44-SSA1-SA15, s. 1582dpd Section 1582dpd. 71.25 (6) (b) of the statutes is created to read:

SB44-SSA1-SA15,8,2 71.25 (6) (b) For taxable years beginning after December 31, 2003, and before January 1, 2005, an apportionment fraction composed of a sales factor under sub. (9) representing 60% of the fraction, a property factor under sub. (7) representing 20% of the fraction, and a payroll factor under sub. (8) representing 20% of the fraction.

SB44-SSA1-SA15, s. 1582dpe Section 1582dpe. 71.25 (6) (c) of the statutes is created to read:

SB44-SSA1-SA15,8,7 71.25 (6) (c) For taxable years beginning after December 31, 2004, and before January 1, 2006, an apportionment fraction composed of a sales factor under sub. (9) representing 80% of the fraction, a property factor under sub. (7) representing 10% of the fraction, and a payroll factor under sub. (8) representing 10% of the fraction.

SB44-SSA1-SA15, s. 1582dpf Section 1582dpf. 71.25 (6) (d) of the statutes is created to read:

SB44-SSA1-SA15,8,10 71.25 (6) (d) For taxable years beginning after December 31, 2005, an apportionment fraction composed of the sales factor under sub. (9).

SB44-SSA1-SA15, s. 1582dpg Section 1582dpg. 71.25 (6) (e) of the statutes is created to read:

SB44-SSA1-SA15,8,18 71.25 (6) (e) For taxable years beginning after December 31, 2003, and before January 1, 2006, the apportionment fraction for the remaining net income of a financial organization shall include a sales factor that represents more than 50% of the apportionment fraction, as determined by rule by the department. For taxable years beginning after December 31, 2005, the apportionment fraction for the remaining net income of a financial organization is composed of a sales factor, as determined by rule by the department.

SB44-SSA1-SA15, s. 1582dph Section 1582dph. 71.25 (6m) of the statutes is created to read:

SB44-SSA1-SA15,8,24 71.25 (6m) Apportionment formula computation. (a) 1. For taxable years beginning before January 1, 2006, if both the numerator and the denominator of the sales factor under sub. (9) related to a taxpayer's remaining net income are zero, the sales factor under sub. (9) is eliminated from the apportionment formula to determine the taxpayer's remaining net income under sub. (6).

SB44-SSA1-SA15,9,4 2. For taxable years beginning after December 31, 2005, if both the numerator and the denominator of the sales factor under sub. (9) related to a taxpayer's remaining net income are zero, none of the taxpayer's remaining net income is apportioned to this state.

SB44-SSA1-SA15,9,9 (b) 1. For taxable years beginning before January 1, 2006, if the numerator of the sales factor under sub. (9) related to a taxpayer's remaining net income is a negative number and the denominator of the sales factor under sub. (9) related to a taxpayer's remaining net income is a positive number, a negative number, or zero, the sales factor under sub. (9) is zero.

SB44-SSA1-SA15,9,14 2. For taxable years beginning after December 31, 2005, if the numerator of the sales factor under sub. (9) related to a taxpayer's remaining net income is a negative number and the denominator of the sales factor under sub. (9) related to a taxpayer's remaining net income is a positive number, a negative number, or zero, none of the taxpayer's remaining net income is apportioned to this state.

SB44-SSA1-SA15,9,19 (c) 1. For taxable years beginning before January 1, 2006, if the numerator of the sales factor under sub. (9) related to a taxpayer's remaining net income is a positive number and the denominator of the sales factor under sub. (9) related to a taxpayer's remaining net income is zero or a negative number, the sales factor under sub. (9) is one.

SB44-SSA1-SA15,9,24 2. For taxable years beginning after December 31, 2005, if the numerator of the sales factor under sub. (9) related to a taxpayer's remaining net income is a positive number and the denominator of the sales factor under sub. (9) related to a taxpayer's remaining net income is zero or a negative number, all of the taxpayer's remaining net income is apportioned to this state.

SB44-SSA1-SA15, s. 1582dpi Section 1582dpi. 71.25 (7) (intro.) of the statutes is amended to read:

SB44-SSA1-SA15,10,2 71.25 (7) Property factor. (intro.) For purposes of sub. (5) (6) and for taxable years beginning before January 1, 2006:

SB44-SSA1-SA15, s. 1582dpj Section 1582dpj. 71.25 (8) (intro.) of the statutes is amended to read:

SB44-SSA1-SA15,10,5 71.25 (8) Payroll factor. (intro.) For purposes of sub. (5) (6) and for taxable years beginning before January 1, 2006:

SB44-SSA1-SA15, s. 1582dpjm Section 1582dpjm. 71.25 (9) (a) of the statutes is amended to read:

SB44-SSA1-SA15,10,17 71.25 (9) (a) The sales factor is a fraction, the numerator of which is the total sales of the taxpayer in this state during the tax period, and the denominator of which is the total sales of the taxpayer everywhere during the tax period. For sales of tangible personal property, the numerator of the sales factor is the sales of the taxpayer during the tax period under par. (b) 1. and 2. plus 50% of the sales of the taxpayer during the tax period under pars. (b) 2m. and 3. and (c). For purposes of determining the numerator of the sales factor for a member of a combined reporting group under s. 71.255 (7), "taxpayer" means the member of a combined reporting group, as defined in s. 71.255 (1) (c), that transferred title to tangible personal property or, for sales other than sales of tangible personal property, that made the sale.

SB44-SSA1-SA15, s. 1582dpk Section 1582dpk. 71.25 (9) (d) of the statutes is amended to read:

SB44-SSA1-SA15,11,2 71.25 (9) (d) Sales, other than sales of tangible personal property, are in this state if the income-producing activity is performed in this state. If the income-producing activity is performed both in and outside this state the sales shall be divided between those states having jurisdiction to tax such business in proportion to the direct costs of performance incurred in each such state in rendering this service. Services performed in states which do not have jurisdiction to tax the business shall be deemed to have been performed in the state to which compensation is allocated by sub. s. 71.25 (8) , 2001 stats.

SB44-SSA1-SA15, s. 1582dpL Section 1582dpL. 71.25 (10) (b) of the statutes is renumbered 71.25 (10) (b) 1. and amended to read:

SB44-SSA1-SA15,11,11 71.25 (10) (b) 1. In this section, for taxable years beginning before January 1, 2004, "public utility" means any business entity described under subd. 2. and any business entity which owns or operates any plant, equipment, property, franchise, or license for the transmission of communications or the production, transmission, sale, delivery, or furnishing of electricity, water or steam the rates of charges for goods or services of which have been established or approved by a federal, state or local government or governmental agency. "Public

SB44-SSA1-SA15,11,17 2. In this section, for taxable years beginning after December 31, 2003, "public utility" also means any business entity providing service to the public and engaged in the transportation of goods and persons for hire, as defined in s. 194.01 (4), regardless of whether or not the entity's rates or charges for services have been established or approved by a federal, state or local government or governmental agency.

SB44-SSA1-SA15, s. 1582dpm Section 1582dpm. 71.25 (10) (c) of the statutes is amended to read:

SB44-SSA1-SA15,11,23 71.25 (10) (c) The net business income of railroads, sleeping car companies, car line companies, pipeline companies, financial organizations, air carriers, and public utilities requiring apportionment shall be apportioned pursuant to rules of the department of revenue, but the income taxed is limited to the income derived from business transacted and property located within the state.

SB44-SSA1-SA15, s. 1582dpn Section 1582dpn. 71.25 (11) of the statutes is amended to read:

SB44-SSA1-SA15,12,11 71.25 (11) Department may waive factor. Where, in the case of any corporation engaged in business within in and without the outside of this state of Wisconsin and required to apportion its income as provided in sub. (6), it shall be shown to the satisfaction of the department of revenue that the use of any one of the 3 factors provided in sub. (6) gives an unreasonable or inequitable final average ratio because of the fact that such corporation does not employ, to any appreciable extent in its trade or business in producing the income taxed, the factors made use of in obtaining such ratio, this factor may, with the approval of the department of revenue, be omitted in obtaining the final average ratio which is to be applied to the remaining net income. This subsection does not apply to taxable years beginning after December 31, 2005.

SB44-SSA1-SA15, s. 1582dpo Section 1582dpo. 71.255 of the statutes is created to read:

SB44-SSA1-SA15,12,13 71.255 Combined reporting. (1) Definitions. In this section:

SB44-SSA1-SA15,12,17 (a) "Brother-sister parent corporation" means a parent corporation that is a member of a commonly controlled group, if any members of the commonly controlled group are not connected to the parent corporation by stock ownership or interest ownership as described in par. (d).

SB44-SSA1-SA15,12,20 (b) "Combined report" means a form prescribed by the department that specifies the income of each taxpayer member of a commonly controlled group operating as a unitary business.

SB44-SSA1-SA15,12,22 (c) "Combined reporting group" means the members of a commonly controlled group that are included in a combined report under sub. (2).

SB44-SSA1-SA15,12,24 (d) "Commonly controlled group" means any of the following, but does not include an insurer that is exempt from taxation under s. 71.45 (1):

SB44-SSA1-SA15,13,6 1. A parent corporation and any corporation or chain 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% 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% of the voting power of each of the connected corporations.

SB44-SSA1-SA15,13,9 2. Any 2 or more corporations if a common owner directly or indirectly owns stock representing more than 50% of the voting power of the corporations or the connected corporations.

SB44-SSA1-SA15,13,13 3. A partnership or limited liability company if a parent corporation or any corporation connected to the parent corporation by common ownership directly or indirectly owns more than a 50% interest in the capital and profits of the partnership or limited liability company.

SB44-SSA1-SA15,13,15 4. Any 2 or more corporations if stock representing more than 50% of the voting power in each corporation are interests that cannot be separately transferred.

SB44-SSA1-SA15,13,20 5. Any 2 or more corporations if stock representing more than 50% of the voting power in each corporation is directly owned by, or for the benefit of, family members. In this subdivision, "family members" means an individual related by blood, marriage, or adoption within the 2nd degree of kinship as computed under s. 852.03 (2), 1995 stats., or the spouse of such an individual.

SB44-SSA1-SA15,13,25 6. A corporation, partnership, or limited liability company if a parent corporation or any corporation connected to the parent corporation by common ownership does not hold more than a 50% ownership interest in the corporation, partnership, or limited liability company but effectively controls the corporation, partnership, or limited liability company.

SB44-SSA1-SA15,14,1 (e) "Corporation" has the meaning given in s. 71.22 (1) or 71.42 (1).

SB44-SSA1-SA15,14,2 (f) "Department" means the department of revenue.

SB44-SSA1-SA15,14,5 (g) "Designated agent" means the taxpayer member of a commonly controlled group who files a group return on behalf of the taxpayer members of a combined reporting group.

SB44-SSA1-SA15,14,7 (h) "Group return" means a tax return filed on behalf of the taxpayer members of a combined reporting group.

SB44-SSA1-SA15,14,10 (i) "Intercompany transaction" means a transaction between corporations, partnerships, or limited liability companies that become members of the same combined reporting group immediately after the transaction.

SB44-SSA1-SA15,14,12 (im) "Partnership" means any entity considered a partnership under section 7701 of the Internal Revenue Code.

SB44-SSA1-SA15,14,15 (j) "Separate return" means a return filed by a corporation, regardless of whether the corporation is a member of a combined reporting group or is required to file a tax return under s. 71.24 or 71.44.

SB44-SSA1-SA15,14,18 (k) "Taxpayer member" means a corporation that is subject to tax under s. 71.23 (1) or (2) or 71.43, that is a member of a combined reporting group, and that files a combined report under this section.

SB44-SSA1-SA15,14,24 (L) "Top tier corporation" means a member of a commonly controlled group that is not connected with a parent corporation by stock ownership or interest ownership as described in par. (d), is a parent corporation, or is a brother-sister parent corporation, regardless of whether it is doing business in this state or deriving income from sources in this state, and regardless of whether its income and apportionment factors are excluded from a combined report filed under this section.

SB44-SSA1-SA15,15,9 (m) "Unitary business" includes the business activities or operations of an entity that are of mutual benefit to, integrated with, or dependent upon or that contribute to activities of at least one other entity, including transactions that serve an operational function, as determined by the department. Two or more businesses are presumed to be a unitary business if the businesses have unity of ownership, operation, and use as indicated by centralized management or a centralized executive force; centralized purchasing, advertising, or accounting; intercorporate sales or leases; intercorporate services; intercorporate debts; intercorporate use of proprietary materials; interlocking directorates; or interlocking corporate officers.

SB44-SSA1-SA15,15,18 (2) Corporations required to use combined reporting. (a) Except as provided in par. (b), and subject to sub. (6), a corporation that is subject to the tax imposed under s. 71.23 (1) or (2) or 71.43, that is a member of a commonly controlled group, and that is engaged, in whole or in part, in a unitary business with one or more members of the commonly controlled group shall compute the corporation's income attributable to this state by using the income computation under s. 71.26 or 71.45, the apportionment formula under s. 71.25 (6) or 71.45, and the tax credits under s. 71.28 or 71.47 of all of the following that are members of the commonly controlled group:

SB44-SSA1-SA15,15,23 1. Any corporation organized or incorporated under the laws of the United States, any state of the United States, the District of Columbia, the Commonwealth of Puerto Rico, any possession of the United States, or any political subdivision of the United States, including corporations under sections 931 to 936 of the Internal Revenue Code.

SB44-SSA1-SA15,15,25 2. Any domestic international sales corporation under sections 991 to 994 of the Internal Revenue Code.

SB44-SSA1-SA15,16,2 3. Any foreign sales corporation under sections 921 to 927 of the Internal Revenue Code.

SB44-SSA1-SA15,16,4 4. Any export trade corporation under sections 970 and 971 of the Internal Revenue Code.

SB44-SSA1-SA15,16,9 5. Any corporation regardless of its place of incorporation if the average of its property factor under s. 71.25 (7) and its payroll factor under s. 71.25 (8), for property and payroll within the United States and computed on an annual basis, is at least 20% during any part of the taxable year that a corporation is a member of the commonly controlled group.

SB44-SSA1-SA15,16,13 6. Any corporation not described in subds. 1. to 5. to the extent of the corporation's income within the United States and the corporation's property factor under s. 71.25 (7) and payroll factor under s. 71.25 (8) assignable to a location within the United States.

SB44-SSA1-SA15,16,24 (b) A corporation that is subject to the tax imposed under s. 71.23 (1) or (2) or 71.43, that is a member of a commonly controlled group, and that is engaged, in whole or in part, in a unitary business with one or more members of the commonly controlled group may, subject to sub. (6), compute the corporation's income attributable to this state by using the income computation under s. 71.26 or 71.45, the apportionment formula under s. 71.25 (6) or 71.45, and the tax credits under s. 71.28 or 71.47 of all the members of the commonly controlled group, regardless of the country in which any member of the commonly controlled group is organized or incorporated or conducts business, if all top tier corporations that are members of the commonly controlled group elect under sub. (3) to compute the corporation's income as provided under this paragraph.

SB44-SSA1-SA15,17,8 (3) Computation election. (a) A top tier corporation that is a member of a commonly controlled group may elect on the commonly controlled group's behalf, and in the manner prescribed by the department, to compute the income of each corporation that is a member of the commonly controlled group under sub. (2) (b). If more than one member of the commonly controlled group is a top tier corporation, an election under this subsection is not effective unless all top tier corporations elect on the commonly controlled group's behalf, and in the manner prescribed by the department, to compute income under sub. (2) (b).

SB44-SSA1-SA15,17,16 (b) A top tier corporation shall file an election made under par. (a) with the department before the last day of the taxable year. The top tier corporation shall designate a taxable year that corresponds with the taxable year of any taxpayer member that is subject to the tax imposed under s. 71.23 (1) or (2) or 71.43. If the top tier corporation fails to file the election before the last day of the taxable year designated under this paragraph, all members of the commonly controlled group to which the top tier corporation belongs, including the top tier corporation, shall compute income under sub. (2) (a).

SB44-SSA1-SA15,18,2 (c) Except as provided under par. (d), the members of the commonly controlled group subject to an election under this subsection shall compute their income under sub. (2) (b) for 7 taxable years, beginning with the taxable year designated under par. (b). Thereafter, the members of the commonly controlled group shall compute their income under sub. (2) (b) for periods of 7 taxable years and until any top tier corporation that is a member of the commonly controlled group notifies the department, in a manner prescribed by the department, before the last day of the last taxable year in any period of 7 taxable years that the top tier corporation is terminating the election under this subsection. A termination under this paragraph takes effect on the first day of the first taxable year beginning after the top tier corporation notifies the department under this paragraph.

SB44-SSA1-SA15,18,7 (d) The department may grant a request by a top tier corporation to terminate an election under this subsection before the first period of 7 taxable years under par. (c) expires, if the top tier corporation shows good cause for granting the request, as determined by the department and consistent with section 1502 of the Internal Revenue Code.

SB44-SSA1-SA15,18,12 (e) Except as provided in par. (f), if an election by a top tier corporation on behalf of the members of a commonly controlled group under this subsection is terminated, no top tier corporation may make an election on behalf of the members of the same commonly controlled group until 7 taxable years have elapsed from the day that the termination of the original election took effect.

SB44-SSA1-SA15,18,17 (f) The department may grant a request by a top tier corporation to make an election under this subsection before the period of 7 taxable years under par. (e) have elapsed, if the top tier corporation shows good cause for granting the request, as determined by the department and consistent with section 1502 of the Internal Revenue Code.

SB44-SSA1-SA15,19,4 (4) Accounting period. For purposes of this section, the income under ss. 71.26 and 71.45, the apportionment factors under ss. 71.25 and 71.45 and the tax credits under ss. 71.28 and 71.47 of all corporations that are members of a combined reporting group shall be determined by using the same accounting period. If the combined reporting group has a common parent corporation, the accounting period of the common parent corporation shall be used to determine the income, the apportionment factors, and the tax credits of all the corporations that are members of the combined reporting group. If the combined reporting group has no common parent corporation, the income, the apportionment factors, and the tax credits of the combined reporting group shall be determined using the accounting period of the member of the combined reporting group that has the most significant operations on a recurring basis in this state, as determined by the department.

SB44-SSA1-SA15,19,13 (5) Filing returns. (a) Corporations with the same accounting period. Corporations that must file a combined report under this section and that have the same accounting period may file a group return, as prescribed by the department, that reports the aggregate state franchise or state income tax liability of all of the members of the combined reporting group. Corporations that are required to file a combined report under this section may file separate returns reporting the respective apportionment of the corporation's state franchise or state income tax liability as determined under sub. (2), if each corporation filing a separate return pays its own apportionment of its state franchise or state income tax liability.

SB44-SSA1-SA15,20,2 (b) Corporations with different accounting periods. Corporations that are required to file a combined report and that have different accounting periods shall file separate returns and shall use the actual figures from the corporations' financial records to determine the proper income and income-related computations to convert to a common accounting period. Corporations that are required to file a combined report may use a proportional method to convert income to a common accounting period if the results of the proportional method do not materially misrepresent the income apportioned to this state. The apportionment factors under ss. 71.25 and 71.45 and the tax credits under ss. 71.28 and 71.47 shall be computed according to the same method used to determine the income under ss. 71.26 and 71.45 for the common accounting period. If a corporation performs an interim closing of its financial records to determine the income attributable to the common accounting period, the actual figures from the interim closing shall be used to convert the apportionment factors and tax credits to the common accounting period.

SB44-SSA1-SA15,20,19 (c) Designated agent. 1. For corporations that are subject to this section and that file a group return under par. (a), the parent corporation of the combined reporting group is the sole designated agent for each member of the combined reporting group including the parent corporation, if the parent corporation is a taxpayer member of the combined reporting group and income of the parent corporation is included on the group return. If the parent corporation is not a taxpayer member or if the parent corporation's income is not included on the group return, the taxpayer members may appoint a taxpayer member to be the designated agent. If the parent corporation of the combined reporting group is not eligible to be the designated agent and no taxpayer member is appointed to be the designated agent, the designated agent is the taxpayer member that has the most significant operations in this state on a recurring basis, as determined by the department. The designated agent, as determined under this subdivision, remains the designated agent until the designated agent is no longer a taxpayer member or until the taxpayer members appoint a different designated agent. If the designated agent changes, the combined reporting group shall notify the department of such a change, in a manner prescribed by the department.

SB44-SSA1-SA15,21,17 2. The designated agent shall file the group return under par. (a), shall file for any extensions under s. 71.24 (7) or 71.44 (3), shall file amended reports and claims for refund or credit, and shall send and receive all correspondence with the department regarding a group return. Any notice the department sends to the designated agent is considered a notice sent to all members of the combined reporting group. Any refund with respect to a group return shall be paid to and in the name of the designated agent and shall discharge any liability of the state to any member of a combined reporting group regarding the refund. The combined reporting group filing a group return under par. (a) shall pay all taxes, including estimated taxes, in the designated agent's name. The designated agent shall participate on behalf of the members of the combined reporting group in any investigation or hearing requested by the department regarding a group return and shall produce all information requested by the department regarding a group return. The designated agent may execute a power of attorney on behalf of the members of the combined reporting group. The designated agent shall execute waivers, closing agreements, and other documents regarding a group return filed under par. (a) and any waiver, agreement, or document executed by the designated agent shall be considered as executed by all members of the combined reporting group. If the department acts in good faith with a combined reporting group member that represents itself as the designated agent for the combined reporting group but that combined reporting group member is not the designated agent, any action taken by the department with that combined reporting group member has the same effect as if that combined reporting group member were the actual designated agent for the combined reporting group.

SB44-SSA1-SA15,21,21 (d) Part-year members. If a corporation becomes a member of a combined reporting group or ceases to be a member of a combined reporting group after the beginning of a common accounting period, the corporation's income shall be apportioned to this state as follows:

SB44-SSA1-SA15,22,5 1. If the corporation is required to file 2 or more short period federal returns for the common accounting period, the income for the short period that the corporation was a member of a combined reporting group shall be determined as provided under sub. (2), the corporation shall join in filing a combined report for that short period, and the corporation may join in filing a group return for that short period. The income for the remaining short period shall be reported on a separate return under s. 71.26 or 71.45. If the corporation becomes a member of another combined reporting group in the remaining short period, the corporation's income shall be determined for the remaining short period as provided under sub. (2).

SB44-SSA1-SA15,22,7 2. If the corporation is not required to file federal short period returns, the corporation shall file a separate return. Income shall be determined as follows:

SB44-SSA1-SA15,22,9 a. As provided under sub. (2) for any period that the corporation was a member of a combined reporting group.

SB44-SSA1-SA15,22,11 b. As a separate entity under s. 71.26 or 71.45 for any period that the corporation was not a member of a combined reporting group.

SB44-SSA1-SA15,22,15 (e) Amended group return. The election to file a group return under this section applies to an amended group return that includes the same corporations that joined in the filing of the original group return. Under this section, an amended group return shall be filed as follows:

SB44-SSA1-SA15,22,24 1. If an election to file a group return that is in effect for a taxable year is revoked for the taxable year because the combined reporting group that filed the group return is not subject to sub. (2), as determined by the department, the designated agent for the combined reporting group may not file an amended group return. The designated agent and each corporation that joined in filing the group return shall file a separate amended return. To compute the tax due on a separate amended return, a corporation that files a separate amended return shall consider all of the payments, credits, or other amounts, including refunds, that the designated agent allocated to the corporation.

SB44-SSA1-SA15,23,5 2. If a change in tax liability under this section is the result of the removal of a corporation from a combined reporting group because the corporation was not eligible to be a member of the combined reporting group for the taxable year, as determined by the department, the designated agent shall file an amended group return and the ineligible corporation shall file a separate amended return.

SB44-SSA1-SA15,23,11 3. If a corporation erroneously fails to join in the filing of a group return, the designated agent shall file an amended group return that includes the corporation. If a corporation that erroneously fails to join in the filing of a group return has filed a separate return, the corporation shall file an amended separate return that shows no net income, overpayment, or underpayment, and shows that the corporation has joined in the filing of a group return.

SB44-SSA1-SA15,23,13 (6) Income computation under combined reporting. For the purposes of sub. (2), income attributable to this state shall be determined as follows: