How can I file someone elses taxes? While I am logged in?

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You need to sign out of your account and create a new account to file another person's tax return. Each TurboTax Online account lets you file only one federal tax return. If you use your account to file another return, you'll overwrite your information and you won't be able to access it again. Please see the FAQ below for more information.

How do I start another return in TurboTax Online? https://ttlc.intuit.com/replies/3288574