IRS Notice CP12A – Changes to Your Form 1040

The IRS sends CP12A to notify you that your return had a math error in the earned income tax credit calculation resulting in a refund or a larger refund amount.

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Type of Notice: Return accuracy

Most common tax problem area: IRS return and account problems

Why you received IRS Notice CP12A

  1. You filed a tax return claiming the Earned Income Tax Credit.
  2. When processing your return, the IRS discovered a miscalculation.
  3. The IRS corrected the error and made an adjustment to your return.
  4. CP12A was sent to notify you that the adjustment resulted in a refund or an increase in your refund. The IRS will issue the refund in four to six weeks.

Your options to address IRS Notice CP12A

No response required

Notice deadline: 60 days

If you miss the deadline: If you do not dispute the changes on a CP12A within 60 days, the IRS will not reverse the adjustment and you will lose your right to appeal the IRS decision.

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