how do a start a new tax return for an adult child?

[bwebb1]

Says one can file up to 5 federal returns. How do I set up a new taxpayer?

[xmasbaby0]

Your question is posting from online TurboTax, from which you do not get five e-files.

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/

[MinhT1]

If you are using TurboTax Online, you cannot prepare and file a tax return for another person using an existing TurboTax account. You'll need to create a new account, distinct from the account you used to file the first return.

If you are using TurboTax Desktop, you can start a new return by clicking on Start a new return on the Welcome page of TurboTax.

Please read this TurboTax Help topic on how to start a new tax return for another person.

[xmasbaby0]

If you are actually using desktop download software, you open the TurboTax program from your own hard drive then go up to the top of your screen to File.  Click File, then click New Tax Return to start a return for different person.