Once TurboTax is installed, when you open the program, you are asked to Register your account by filling out a form.
So each person using the program registers and Efiles separately. This would apply even if several people are using the program on the same computer, as each person 'starts a new return' and has a separate registration.
You don't need a User ID and Password to prepare/efile a return in TurboTax Desktop. Your TurboTax Account is not being accessed.
Here's more info about Installing TurboTax on more than one computer.
@psltax145
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