The Child Tax Credit is one of the more valuable and widely claimed credits on the federal return, worth $2,200 per qualifying child for 2026 and made permanent under the OBBBA. But "$2,200 per child" is the headline, not the whole story — refundability limits, an income phase-out with an unusually wide gap between filing statuses, and a specific SSN requirement all shape how much of it a given family actually gets.
The credit vs. what's refundable
A tax credit reduces your tax bill dollar for dollar — a much stronger benefit than a deduction, which only reduces taxable income. But of the $2,200 credit, only up to $1,700 per child is refundable, through what's formally called the Additional Child Tax Credit. That $1,700 portion you can receive even if it exceeds your total tax liability, effectively as a payment. The remaining $500 is nonrefundable: it can only offset tax you actually owe, and if your liability is already $0 before applying the credit, that $500 portion simply goes unused rather than becoming a check.
The income phase-out (with an unusual gap)
The credit starts phasing out at $200,000 MAGI for single filers, head of household, and married filing separately — and at $400,000 for married filing jointly. That $400,000 threshold is exactly double the single threshold, which is actually unusual: most tax provisions set the married-filing-jointly threshold at exactly double the single amount as a matter of routine, but a few (like the Child Tax Credit, historically) deliberately widen the gap to favor married filers. The credit shrinks by $50 for every $1,000 (or part of $1,000) your MAGI exceeds the threshold, so a family with one child and $210,000 MAGI (single) is $10,000 over — 10 full increments, cutting the credit by $500, from $2,200 down to $1,700.
The SSN requirement, easy to overlook
The qualifying child needs a valid Social Security Number, issued on or before the due date of the return (including any extension you file). This tripped up a meaningful number of families after a 2017 law change first introduced the requirement — an ITIN, which some family members without SSN eligibility do have, is not sufficient for the CHILD specifically, even though the parent claiming the credit can file with an SSN or an ITIN of their own.
Common mistakes
The most common error is assuming the entire $2,200 is refundable — only the $1,700 Additional Child Tax Credit portion is. The second is missing the age cutoff: the child must be under 17 at year-end, so a 16-year-old who turns 17 in November no longer qualifies for that same tax year, a detail that catches families off guard every single year. The third is forgetting the SSN timing requirement when a child was born or received their SSN late in the year, or close to the filing deadline.