Perhaps your return requires a tax form that will not be available from the taxing authority until that date? For state forms availability dates, see https://ttlc.intuit.com/community/forms/help/state-forms-availability-table-for-turbotax-individual-...
For federal see https://ttlc.intuit.com/community/forms/help/irs-forms-availability-table-for-turbotax-individual-pe...
