Child Tax Credit

The child tax credit is $2,200 per qualifying child under 17 for 2026, with up to $1,700 of it refundable, meaning it pays out even when the tax bill is smaller. The credit phases out above $400,000 of modified income for joint filers and $200,000 for single filers, losing $50 for every $1,000 above the line. A $500 credit for other dependents covers older children and adult dependents.

The qualification test is the fine print. The child must be under 17 at the end of the year, a US citizen or resident with a Social Security number, and live with the taxpayer for more than half the year. The credit is not a deduction; it subtracts from the tax bill dollar for dollar, and the refundable portion pays out in cash when the bill runs out. The earned income test governs the refundable portion, phasing in at 15% of earned income above $2,500.

The arithmetic is per child, against the tax bill. Two children under 17 is $4,400 subtracted from the federal tax owed, after the standard deduction and the brackets have computed it. The phase-out is the cliff: at $410,000 joint, the credit drops to $3,900, and it runs out entirely near $444,000 for two children. The $500 other-dependent credit fills the gap for the 17-year-old.

The refundable mechanics run on earned income. The nonrefundable portion zeroes the bill first; when the bill is smaller than the credit, the refundable $1,700 pays out, phased in at 15% of earned income above $2,500, so a family needs roughly $13,833 of earned income to draw the full refundable amount. The schedule matches most working households, which is the design. The credit is claimed on Form 1040 with the child's Social Security number, and the IRS matching checks the birth dates and the residency.

The interaction with the dependent care FSA is the double-claim trap: the same childcare expenses cannot fund both the FSA and the child and dependent care credit, though the child tax credit itself is separate from both. The phase-out thresholds are not indexed under current law beyond the 2025 reset, which is the slow trap: salaries rise, the lines stay. The credit was $1,000 in 2017, $2,000 from 2018, and $2,200 from 2025.

The credit is the largest per-child line on the family return, and it is the difference between owing and refunding for most young households. The phase-out is the number high earners need to check, and the refundable portion is the number low earners need to know. The qualification test is the fine print the IRS matching actually reads.

I watched a colleague named Brent (yes, that Brent) file his return in February with his son's Social Security number still at the hospital office, and the IRS matching held the credit for weeks. The credit was $2,200; the delay was the refund he had budgeted for March. The qualification test is the paperwork, and the paperwork is the refund date.

The highest-leverage thing most American families can do is file the Social Security numbers on time and check the phase-out before planning the refund. Run the full-year picture with the income tax calculator, see the filing-status side with the marriage tax calculator, and check the childcare discount in the dependent care FSA entry.