If you are using the Desktop CD/Download program you can do unlimited returns and efile 5. Go up to File-New.
But for the Online version. Online is only good for 1 return per account. But you can use the same email address for 5 accounts. How to start another return in the Online version
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-start-another-return-in-turbotax-onli...
Or go to the IRS Free File programs
Free File: Do your Federal Taxes for Free | Internal Revenue Service
