If you have not already filed your tax return, follow these steps to change your bank information:
To edit your bank account for direct deposit of your refund in TurboTax Online before you E-file:
To edit your bank account for direct deposit of your refund in TurboTax Desktop before you E-file:
If you transferred in information from your 2015 tax return, you may be shown the same bank information that was used last year to have your refund direct deposited. Here’s a Workaround:
https://ttlc.intuit.com/replies/5619072
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NOTE: If you have already filed and your tax return shows Pending, you will need to wait until the IRS either Accepts or Rejects the tax return. If your return is Rejected, then you will be able to change the information, just follow the steps above.
If the IRS is unable to deposit your refund in your account, they will mail you a refund check.
Here is a great FAQ that explains this further:
https://ttlc.intuit.com/replies/3302459