Turbotax used my adoption tax credit first to reduce my tax liability to zero. Then it added the additional child tax credit. IRS says this calculation is incorrect.

[Hal_Al · Accepted solution]

Your income is too high. The Child Tax Credit (CTC) is phased out at higher incomes starting at $110,000 for joint filers  ($75K single). You lose $50 for each $1000 (rounding up) your income is over that threshold.

OR

Your income is too low.  The child tax credit  (CTC) is also limited to your tax liability. The CTC is a non-refundable credit and can only reduce your income tax to 0, It can not help you beyond eliminating your tax liability. But, if you have more than $3000 of earned income, some or all of it is usually given back to you thru the "Additional Child tax credit". That is, part of the CTC may be on line 43 of form 1040A instead of line 35 (lines 67 & 52 of form 1040).    In the on-line version of TT,  the  main Form 1040, 1040A or 1040EZ can be seen through Tools, View Tax Summary, Preview My 1040 or  go to Print Center and then choose to Preview. The ACTC is calculated on form 8812; that form is not viewable in the online version of TT until you have paid for your return. But, the ACTC is basically 15% of your earned income over $3000.