get Form 1040-X from IRS website and mail it in with your 2023 Form 5329 which you can also get in editable PDF.
Do not include your old 1040 nor your revised 1040 because the Form 1040-X reflects any changes there and becomes your new tax return.
Note: When you are not changing any dollar amounts on your amended tax return, you can leave all the lines 1-23 EMPTY.
Assuming your allowed contribution is at least as great as the excess, no dollar amounts will be changing.
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