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71.25
(6) Allocation and separate accounting and apportionment formula. 6Corporations engaged in business within and without the state shall be taxed only
7on such income as is derived from business transacted and property located within
8the state. The amount of such income attributable to Wisconsin may be determined
9by an allocation and separate accounting thereof, when the business of such
10corporation within the state is not an integral part of a unitary business, but the
11department of revenue may permit an allocation and separate accounting in any case
12in which it is satisfied that the use of such method will properly reflect the income
13taxable by this state. In all cases in which allocation and separate accounting is not
1permissible, the determination shall be made in the following manner: for all
2businesses except financial organizations, public utilities, railroads, sleeping car
3companies, car line companies and corporations or associations that are subject to
4a tax on unrelated business income under s. 71.26 (1) (a) there shall first be deducted
5from the total net income of the taxpayer the part thereof (less related expenses, if
6any) that follows the situs of the property or the residence of the recipient. The
7remaining net income shall be apportioned to Wisconsin by use of an apportionment
8fraction composed of
a the sales factor under sub. (9)
representing 50% of the fraction,
9a property factor under sub. (7) representing 25% of the fraction and a payroll factor
10under sub. (8) representing 25% of the fraction.
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(9) (d) Sales, other than sales of tangible personal property, are in this
14state if the income-producing activity is performed in this state. If the
15income-producing activity is performed both in and outside this state the sales shall
16be divided between those states having jurisdiction to tax such business in
17proportion to the direct costs of performance incurred in each such state in rendering
18this service. Services performed in states which do not have jurisdiction to tax the
19business shall be deemed to have been performed in the state to which compensation
20is would be allocated by sub. (8)
, 1995 stats.".