Notice code 628 (1040A) — We changed the amount claimed as Child Tax Credit and/or Additional Child Tax Credit on your Form 10…

We changed the amount claimed as Child Tax Credit and/or Additional Child Tax Credit on your Form 1040A because there was an error on Schedule 8812, Child Tax Credit. The error was in the:  computation of the credit on Schedule 8812  transfer of the amount of Child Tax Credit to line 35 and/or Additional Child Tax Credit line 43 of your Form 1040A and/or  Schedule 8812 was missing or incomplet…

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What the IRS language says

We changed the amount claimed as Child Tax Credit and/or Additional Child Tax Credit on your Form 1040A because there was an error on Schedule 8812, Child Tax Credit. The error was in the:  computation of the credit on Schedule 8812  transfer of the amount of Child Tax Credit to line 35 and/or Additional Child Tax Credit line 43 of your Form 1040A and/or  Schedule 8812 was missing or incomplete.