Yes, a CP21E notice generally means you owe tax though you can have a refund with this notice.
No one in the Community can tell why the IRS adjusted your return from this notice because all it says is that the IRS increased your credit by $5,164.00. As the notice says, “Please see a copy of the audit report for a detailed explanation of the changes.”
You may have credit a larger child tax credit or Earned Income Tax Credit.
Call the IRS at the number listed.
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