Is it possible to use TurboTax to estimate your taxes for the coming year, combining last year's tax data, and manually making changes. This would help me plan.

I have the same question and would appreciate a response!

You would need to re-enter all the information from last year into a new return and then go from there—so long as you do not go to the review section of the return, you won't need to pay.

Thank  you for choosing TurboTax.