Yes it is separate . You need to buy Turbo Tax Business, not to be confused with the personal Home & Business version. Home & Business is just for personal returns that need schedule C for self employment. TT Business is not available to do online or on a Mac. You can buy the Windows Desktop program here,
https://turbotax.intuit.com/small-business-taxes
You can have both a personal program and the Business program installed on the same computer at the same time.
You will get a W2 or K-1 from the business return to enter into your personal return. So you will need to do the Business return first.
Window System Requirements
https://ttlc.intuit.com/community/system-requirements/help/minimum-system-requirements-for-turbotax-...
