This is quite possible.
The child tax credit begins to phase out at modified AGIs of $400,000 on joint returns and $200,000 on single or head-of-household returns. The amount of the credit is reduced by $50 for each $1,000 (or fraction thereof) of modified AGI over the applicable threshold amount.
So if the $19 addition to your MAGI makes it go over the next tranche of $1,000 even by a dollar, your child tax credit is reduced by $50.
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