To delete interest erroneously entered in TurboTax Premier follow these steps.
With TurboTax open click view on the top menu and select forms.
Scroll down the list of forms on the left side of your screen.
Select Form 1099-INT from the Payer you want to edit you will now see Form 1099-INT Worksheet.
If you wish to delete the 1099-INT for this Payer click Delete Form on the bottom of your screen.
To edit the amount click on the amount in box 1 and then click the "+"
A worksheet will be displayed where you can delete the interest erroneously entered.