In the Iowa state section of TurboTax, you will see "Tell Us Your County and School District". TurboTax will add the information to the Line 19of your Iowa return.
The applicable school district is the one in which you resided on the last day of the tax year (12/31/2024 for calendar-year filers), not necessarily the district where your children attend school. Taxpayers without children, or without children in public school, are still subject to this tax.
Counties may impose a countywide Emergency Medical Services (EMS) income surtax. At this time, Appanoose, Pocahontas, Shelby, and Winnebago are the only counties that have an EMS surtax. The EMS surtax is included in the school district surtax table.