A county auditor, after receiving statements of the rates and sums to be levied for the current year from the department and from other officers and authorities legally empowered to determine the rate or amount of taxes to be levied for the various purposes authorized by law, shall immediately proceed to determine the sums to be levied upon each tract and lot of real property and upon the amount of personal property, monies, and credits listed in his county in the name of each person. The assessment must be made equally on all real and personal property subject to the taxes and entered in one or more columns in the manner and form as the department shall prescribe. The department or the county auditor shall place a minimum assessment of at least twenty dollars on all personal property that generates a tax bill, unless a higher minimum assessment is otherwise required by law.