Can I use one turbo tax account for filing two tax returns?
No, not in TurboTax Online. You will
need to create a new user id when starting a new return as using the same
account will overwrite the return already filed or started. Please
see the following TurboTax FAQ on how to start another return in TurboTax
Online:
You have clicked a link to a site outside of the TurboTax Community. By clicking "Continue", you will leave the Community and be taken to that site instead.