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IRS Notice CP21B – Changes to Your Form 1040

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The IRS sent CP21B to notify you that data processing made a change to your return, and a refund is now due to you.

View notice image

Type of Notice: Return accuracy

Most common tax problem area: IRS return and account problems

Why you received IRS Notice CP21B

  1. After you filed your tax return you discovered an error.
  2. You either contacted the IRS to correct the error or filed an amended return.
  3. The IRS corrected the error and made an adjustment to your return.
  4. CP21B 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 two to three weeks.


Notice deadline: N/A

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