You can use the same account to prepare and file your son's return, but you can also choose a different version of TurboTax Do-It-Yourself to file his return in the same account.
I also suggest making a new account for him and filing his returns there. This way, if you ever want to file his return separately, you won't be able to import information from a previous year because you used a different account. By giving him his own sign-in now, he will have a clean, continuous tax history that he can take over when he is ready to file his own taxes.
Thank you for choosing TurboTax.
