To file an additional return with TurboTax Online you would have to start a new account, with a new user id and password, and you would have to pay separately for each one.
If you have several returns to file, the TurboTax Desktop version may be better because you can prepare as many returns as you would like and can e-file up to five for free. Any additional returns would have to be mailed.
You can also get one free state program with the TurboTax Desktop version, but will be charged to e-file every state return.
