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IRS Notice CP12 – Changes to Your Form 1040

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The IRS sends CP12 when it changes your original return due to an error, resulting in a refund or a refund amount different than you expected.

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Type of Notice: Return accuracy

Most common tax problem area: IRS return and account problems

Why you received IRS Notice CP12

  1. You filed a tax return with the IRS.
  2. When processing your return, the IRS discovered a miscalculation.
  3. The IRS corrected the error and made an adjustment to your return.
  4. CP12 was sent to notify you that the adjustment resulted in a refund or a different refund amount. The IRS will issue the refund in four to six weeks.


Notice deadline: 60 days

If you miss the deadline: If you do not dispute the changes on a CP12 within 60 days, the IRS will not reverse the adjustment without substantiation and you will lose your right to appeal the IRS decision.

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