If you are using the TurboTax online web-based editions, only one tax return can be completed and filed for each account and User ID.
To complete and file another tax return using the online editions you would need to start a new account with a new User ID. Go to this TurboTax website and click on Sign up in the upper right to start a new account - https://turbotax.intuit.com/personal-taxes/online/file-your-own-taxes/
Using the TurboTax desktop CD/Download editions you can complete and file as many tax returns as needed after the purchase and installation of the software on a personal computer.
TurboTax desktop CD/Download editions - https://turbotax.intuit.com/personal-taxes/cd-download/
