Can I use my TurboTax account to file my son's tax return? Or must I create a different online account for him?

[SteamTrain]

You must create an entirely separate Online tax account for his tax return.

Only the Desktop software allows you to create multiple separate tax returns for your family members.  (still has a separate state e-file fee though  20-$25 except for NY state)

[xmasbaby0]

When you use Online TurboTax, you get one return per fee.  Each return needs its own account and user ID.   If you use the same account and user ID for a second return, you overwrite the first one and lose it forever.

When you use Desktop TurboTax, which you install from a CD or download to your own hard drive, you can prepare and e-file multiple returns for the cost of the software.  You can e-file up to 5 Federal returns—more if you mail the additional ones.  If you have multiple returns to prepare for family members, Desktop is more cost effective.

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