The Additional Child tax Credit is an extension of the Child Tax Credit.
When the Child Tax Credit is applied, it lowers your tax liability.
If your tax is lowered to zero, but the amount of the child tax credit was not totally used up, the remaining (up to 1,600) is applied and called the "Additional Child Tax Credit" which now can increase your refund.
Last year the Child Tax Credit must have been applied in full, so the additional child tax credit was not required to use the full amount as a credit.
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