I just finished my return and now want to prepare my son's return. How do I start a new return?

[xmasbaby0]

When you use online TurboTax software you get one return per fee.

Each return needs its own email, account and user ID.   If you use the same account and user ID for a second return, the second one overwrites the first return and it is lost forever.  

https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-start-another-return-in-turbotax-onli...

https://turbotax.intuit.com/personal-taxes/online/file-your-own-taxes/

[NicolleR1]

Even you can use the same email to create your son’s return, you must create a separate account.

To do this:

• Sign out of your current TurboTax account to avoid overwriting your previous return.
• On the sign in page select New to TurboTax? Then create the account for your son.
  • Enter your email address, password, phone number and create the Intuit Account.