I want to do a new 2016 tax return - separate from the 2016 tax return I have already done. One return is for myself and the other is for my sister.

[joboxer1202]

I want to use the same account log-in.

[Heather14 · Accepted solution]

To file an additional return using TurboTax Online, you will need to create a new account.  Please see the following TurboTax FAQ for instructions on how to start another return using TurboTax Online.  https://ttlc.intuit.com/replies/3288574

[Sargeant]

You would have to create a new account for your sister. You can use the same email address but different username if you like: https://ttlc.intuit.com/replies/3288574