Question

I need to change from premier to deluxe

I've already entered all of my tax information and am ready to file so prefer not to have to start over.

Hi, in order to downgrade you would have to clear and start over. If you choose to clear and start over here are the steps to follow:

Sign in to TurboTax Online and open your return by clicking the orange Take me to my return button
With your screen maximized, click My Account (at the top of your screen toward the right) and select Clear & Start Over.
Answer Yes to Are you sure you want to clear your return?
After your entries have been cleared out, we'll prompt you to select a TurboTax product so you can start over from the very beginning.