For the Ohio School District income tax form SD 100, you start with the Ohio Adjusted Gross Income (AGI), not the federal AGI. The Ohio AGI is found on line 3 of the Ohio IT 1040. TurboTax (TT) automatically does that (put the IT1040 line 3 amount on line 1 of form SD100.
The Ohio AGI is the federal AGI plus Ohio Schedule A additions and minus Ohio Schedule A deductions.
