You can e-file up to five federal returns with TurboTax Home & Business and TurboTax Business (which is the limit set by the IRS) and print and file essentially an unlimited number of returns. Note, however, that TurboTax is not for use by paid income tax return preparers.

https://turbotax.intuit.com/personal-taxes/cd-download/home-and-business.jsp

https://turbotax.intuit.com/small-business-taxes/