Form IT-558, Adjustments due to Decoupling from the IRC for New York state shows as being available -
https://care-cdn.prodsupportsite.a.intuit.com/forms-availability/turbotax_ny_online_individual.html
Have you updated your TurboTax software? Click on Online at the top of the desktop program screen. Click on Check for Updates.
Click on Forms. When in Forms mode click on Open Form in the upper left of the screen. Type in IT-558
