Use software like Parallels Desktop or VMware Fusion to run Windows alongside macOS.
You will need to purchase a Windows license and the Windows version of TurboTax Business. ⚠️ Important 2018 Considerations TurboTax Desktop | Download Tax Software - Intuit
While TurboTax Home & Business (for self-employed individuals/Schedule C) is compatible with Mac, the TurboTax Business edition (for S-Corps, C-Corps, Partnerships, and Trusts) is strictly . 💻 How to Run TurboTax Business on a Mac
If you have an Intel-based Mac, you can use the built-in Boot Camp Assistant to install Windows on a separate partition.