71.255(7)(b)6.6. 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.

71.255(7)(b)7.7. 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.

71.255(8)(a)(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).

71.255(8)(b)(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:

71.255(8)(c)(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.

71.255(9)(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.

71.255(10)(10) Transition. The department shall deem timely paid the estimated tax payments attributable to income includable in the combined report for installments that become due during the period beginning on January 1, 2009, and ending on March 6, 2009, provided that such estimated tax payments are paid by the next installment due date that follows in sequence following March 6, 2009. However, if the next installment due date that follows in sequence following March 6, 2009, is less than 45 days after March 6, 2009, such estimated tax payments, in addition to the payment due less than 45 days after March 6, 2009, shall be deemed timely paid if paid by the next subsequent installment due date.

71.255(11)(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.

71.26(1)(a)(a) Certain corporations. Income of corporations organized under ch. 185, except income of a cooperative health care association organized under s. 185.981, or of a service insurance corporation organized under ch. 613, that is derived from a health maintenance organization as defined in s. 609.01 (2) or a limited service health organization as defined in s. 609.01 (3), or operating under subch. I of ch. 616 which are bona fide cooperatives operated without pecuniary profit to any shareholder or member, or operated on a cooperative plan pursuant to which they determine and distribute their proceeds in substantial compliance with s. 185.45, and the income, except the unrelated business taxable income as defined in section 512 of the internal revenue code and except income that is derived from a health maintenance organization as defined in s. 609.01 (2) or a limited service health organization as defined in s. 609.01 (3), of all religious, scientific, educational, benevolent or other corporations or associations of individuals not organized or conducted for pecuniary profit. This paragraph does not apply to the income of savings banks, mutual loan corporations or savings and loan associations. This paragraph does not apply to income that is realized from the sale of or purchase and subsequent sale or redemption of lottery prizes if the winning tickets were originally bought in this state. This paragraph applies to the income of credit unions except to the income of any credit union that is derived from public deposits for any taxable year in which the credit union is approved as a public depository under ch. 34 and acts as a depository of state or local funds under s. 186.113 (20). For purposes of this paragraph, the income of a credit union that is derived from public deposits is the product of the credit union’s gross annual income for the taxable year multiplied by a fraction, the numerator of which is the average monthly balance of public deposits in the credit union during the taxable year, and the denominator of which is the average monthly balance of all deposits in the credit union during the taxable year.