The Council shall provide by ordinance, a tax payment schedule and the amount of collection charges and interest to be added to taxes, charges, and assessments on the city tax roll. When so added, such collection charges and interest shall be treated in all respects as an item of taxes and collected as such. If delinquent city taxes are collected by returning the same to the County Treasurer, then all charges and assessments on the tax roll, and any collection charges and interest thereon, which remain unpaid at the time the delinquent tax roll is returned to the County Treasurer shall be treated in all respects as an item of taxes and shall be included with the city taxes spread upon such roll and shall be collected by the County Treasurer in like manner as delinquent taxes are collected on delinquent tax rolls returned to County Treasurers under the general property tax act.