You can use the same email
address if you choose however, you would need to create a new login for the
second tax return. We ask that you create a new login because if
you start another return under your login it would overwrite everything in
the return you just filed. This would replace your information and you would be
unable to retrieve the original return later if needed.
Please follow the steps in
the FAQ for instructions on starting another return
in TurboTax
Online:
https://ttlc.intuit.com/replies/3288574
