If you are using the Online product, this can be hazardous, because you can have only one set of tax data for an account. If you make changes to the numbers in your "real" tax return, unless you are extremely careful, TurboTax will end up remembering your made-up numbers next year.
In this case, it would be safer to create a second Online TurboTax account and reproduce the numbers there - that way, it won't matter if you lose track of what you are doing, because your original tax data will still be there.
If you use the desktop software, on the other hand, you can have up to 5 tax returns at a time (saved under different names on your PC). This is the easy and safer way to do tax planning (of course, this means that you would have to buy the desktop software).
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