If the LLC has elected to be taxed as a C corp or S corp, it still has to file its own tax return on the appropriate form, 1120 or 1120-S, separate from your personal Form 1040 tax return. You could use TurboTax Business to file either such tax return. The mechanics of filing the business tax return are basically the same as if the LLC is treated as a partnership (except that for a C corp there is no Schedule K-1).
