According to my software (2021 download Deluxe), SD100 was available in the 2021 software.
TurboTax (TT) does not automatically prepare a School District return (form SD100), you must initiate it.
At the screen, in the Ohio program, titled "A few things before we wrap up your state taxes"
scroll down to School District taxes.
Or later at the screen "Your 2021 Ohio Taxes are ready for us to check"
-Click Other situations
-Scroll down to School District taxes.
