Contributions shall be paid on the wages defined in division (G) of section 4141.01 of the Revised Code, whenever liability in this or any other state has been established, and shall not be prorated over the entire calendar year or any part thereof. The limit on taxable wages set forth in division (G) of section 4141.01 of the Revised Code applies only to the remuneration paid by each employer to each individual. The limit is an exemption earned by each contributory employer, and the individual's other such employers cannot share in the exemption. In case it is determined that there has been a successorship within the calendar year, the wages of any employee upon which the predecessor has paid contributions shall be included in computing the taxable wages.