The IRS has to finalize the tax forms and schedules for tax year 2017. Then the IRS has to approve the tax forms and schedules included in the 2017 TurboTax tax preparation software before a 2017 tax return can be filed.
Click on Review and there will be a list of forms and schedules included in your tax return that need to be finalized and the dates when they will be available (subject to change).
