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What you did is classified as math error, not filing or reporting error. You don't file amendment to fix math error. It will be automatically fixed by IRS during processing and you will receive a bill with the additional balance due or a letter asking what do you want to do with overpayment.
Read here number 2: https://www.irs.gov/uac/Newsroom/Make-a-Mistake-Amend-Your-Tax-Return
If you owe, you can make additional payment to IRS or just wait for the bill. You should hear from IRS soon.
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