If there is not a single municipal corporation in which the employee spent the "greatest number of days in a calendar year" performing services for or on behalf of the employer, but instead there are two or more municipal corporations in which the employee spent an identical number of days that is greater than the number of days the employee spent in any other municipal corporation, the employer shall allocate any of the employee's qualifying wages subject to division (B)(1)(a) of this section among those two or more municipal corporations. The allocation shall be made using any fair and reasonable method, including, but not limited to, an equal allocation among such municipal corporations or an allocation based upon the time spent or sales made by the employee in each such municipal corporation. A municipal corporation to which qualifying wages are allocated under this division shall be the employee's "principal place of work" with respect to those qualifying wages for the purposes of this section.
For the purposes of this division, the location at which an employee spends a particular day shall be determined in accordance with division (B)(2) of this section, except that "location" shall be substituted for "municipal corporation" wherever "municipal corporation" appears in that division.
To determine whether an employer qualifies as a small employer for a taxable year, a tax administrator may require the employer to provide the tax administrator with the employer's federal income tax return for the preceding taxable year.
Notwithstanding division (D) of this section, if, during a calendar year, the number of days an individual performs personal services at a petroleum refinery exceeds twelve, the employer shall withhold tax for the municipal corporation for the first twelve days for which the employer paid qualifying wages to the individual and for all subsequent days in the calendar year on which the individual performed services at the refinery.
R.C. § 718.011