In TurboTax Online, you can prepare and e-file one federal and up to five associated state returns under the same account login (your account is your username, not your e-mail address). And you can file up to five federal returns under the same email.
You also have the option to use the TurboTax CD/Download product which allows you to e-file up to five federal returns. If you don't want to file for yourself and instead want to file your family members' returns, this is usually the best option.
For each unique federal tax return, you will be required to create a new TurboTax Online account. Each account must have a separate login, and each return should have a unique Social Security or Tax ID number. All accounts may be subject to TurboTax fees depending on the complexity of each federal return, and the number of state returns.
The IRS prohibits using the same email address to e-file more than five federal returns with an online personal tax return preparation product.
If you prepare tax returns for a living, consider ProSeries or Lacerte software, which aren't subject to this limitation.
