If it changes your tax balance due, or refund, then there is really no limit....and we can't predict that.
1) FIRST...you wait for your refund (or pay the balance due) from that original tax return that you filed.....there is nothing you can do now if your original e-file has been accepted. (OF course, if it was filed recently and is rejected, you can just edit in that new 1099-DIV before correcting the other error, and re-e-file).
2) assuming the original e-file was Accepted, you should not touch your tax file to amend it before 1 March...because who knows what other forms or corrected forms may show up...(my brokerage is saying mid-Feb for my forms).
Here's a link to the Amend directions, with some additional procedural links at the bottom:
https://ttlc.intuit.com/replies/3288565
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
