Each year is separate. You have to use a separate program for each year. Online is only good for the current year. 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 if you buy the Desktop CD/Download program you can do unlimited returns for one year. And efile 5 current year returns. You can print and mail any more.
To do prior year returns you have to buy theDesktop programs here. They only sell the last 3 years. You have to mail prior year returns.
https://turbotax.intuit.com/personal-taxes/past-years-products/
You will need a full Windows or Mac to install it on.
