So when you tried the steps above, after you went to Tax Tools and chose to "Transfer last year's return from your computer", and then it told you that you couldn't clear it?
If that's the case, there are a couple of options:
If you want to use Online TurboTax and start with a clear return, you'd have to use a different account (User ID). That creates a bit of an extra burden of keeping track of 2 accounts.
Or you could use desktop software (CD/download).
I assume you haven't already paid in that account. If you have, it becomes a bit more complicated.
