Schedule A will not be finalized until 01/17/2019. The IRS has not yet finalized the instructions for Schedule A. Until the IRS finalizes the federal forms, schedules, instructions and calculations, TurboTax cannot finalize the forms and schedules included in the software.
The IRS has not yet even published a date when they will be accepting any type of 2018 tax return. It is estimated to be sometime in either late January or early February.
With all the tax code changes and changes to the tax forms it would be wise to wait until mid to late February or even early March before anyone should file their 2018 tax return to make sure that most if not all the bugs have been fixed in the IRS systems due to the changes.
