To prepare multiple
returns using TurboTax Online, you will need to set up different accounts. TurboTax Online is set up to
be one tax return per account, however you can have up to 5 accounts per email
address.
See the TurboTax FAQ
below for instructions on how to set up another account to prepare another
return.
https://ttlc.intuit.com/replies/3288574
