You mean The small business program (TT Business) is for 1120 Corporation, 1120S Corp, 1065 Partnership or 1041 Estate/Trust returns? It is a separate program from the Desktop Home & Business program or the Online Self Employed version.
Sorry but Turbo Tax Business is not available to do online or on a Mac. You can probably run the Windows Business program on a Mac using a Windows Emulator like Parallels. But you would have to buy a copy of Windows to install in it. Google Windows on Mac to get articles on the various options
