Since you have not yet filed, as long as your brokerage firm updated your online information too, you would be able to delete everything then import the new information.
You would need to delete every form that has the original information, however, if you start by deleting the 1099-DIV, it should remove the rest of the forms. You would need to look for your Schedule D to see if your schedule D is also deleted. If it is not, then you would need to delete the worksheets.
Sometimes deleting can be tricky, and forms seem to pop back up because something is feeding it. So, double check to be sure everything is gone prior to importing the corrected numbers.
If you are using TurboTax Online, you can view your form by selecting Tax Tools>.Tools>> View Tax Summary>>Preview My 1040. From there, you can look to see if the income is gone from your return on line 3 of your 1040.
If you are using the desktop version, just click on Forms mode and look at line 3 to be sure it is gone. You would also delete the forms in forms mode.
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