The IRS has not yet completed the final processing of all the 2020 tax return forms and schedules that can be included in a federal tax return. The tax codes change from year to year and the IRS must update all the forms and schedules for the current tax year. And has to create new forms and schedules based on any tax code changes.
In the Review section you are shown a list of forms and/or schedules that are included in your federal tax return but not yet finalized.
Go to this TurboTax website for IRS forms availability - https://care-cdn.prodsupportsite.a.intuit.com/forms-availability/turbotax_fed_online_individual.html
