Hello and thank you for using Just Answer,You may receive a letter from the IRS and/or state amount the difference in the reporting. If you do at that time you could send in the correct amounts or you can go ahead and submit the change. There is no set amount that requires a 1040X be filed.
If you wait it could be anywhere form 1 to 3 years before you hear form the IRS about the corrected 1099DIV. They will then require the information. It is generally easier to amend while the information is fresh and documents are in hand.
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