County income or employment taxes are any form of tax for which, under a county ordinance, (1) collection is provided by imposing on employers generally the duty of withholding sums from the pay of employees and making returns of the sums to a designated county officer, department, or instrumentality; and (2) the duty to withhold generally is imposed on the payment of compensation earned within the jurisdiction of the county in the case of employees whose regular place of employment is within such jurisdiction. Whether the tax is described as an income, wage, payroll, earnings, occupational license, or otherwise is immaterial.