You won't be able to if you already filed your tax return and it has been accepted by the IRS.
If you have not already e-filed or mailed your tax return you can change the bank account information by going to the "File" section to make the change:
- Login to TurboTax and go into your tax timeline, select the File tab.
- There are three steps listed. Click on Start/Revisit next to Step 2.
- You'll have the choice for in my bank for direct deposit or paper check to receive in the mail, make sure the I want my refund deposited into this account box is unchecked.
- Select direct deposit, correct the information and then click continue at the bottom.
Please see this TurboTax FAQ for more information if you have already filed your tax return this year with TurboTax.