The Child Tax Credit requires you to claim a child as a dependent on your tax return, and the IRS verifies four things: that you are the child's parent or legal guardian, that the child lived with you for more than half the year, that you paid more than half their living costs, and that the child is a U.S. citizen, national, or resident alien under age 17 at the end of the tax year.

The credit itself is worth up to $2,000 per child, but you only receive it if your income is below a threshold that changes each year. The IRS does not send you a form to fill out asking whether you meet these conditions — instead, you report the information on your tax return (Form 1040, Schedule 8812 if you have other credits), and the IRS cross-checks it against Social Security records, immigration databases, and other returns they have on file.

If you do not file a tax return, you cannot claim the credit. If you file but do not report the child, you do not receive it. The credit is not something you request separately; it flows from the information you provide when you file.

Key Takeaways

  • You must claim the child as a dependent on your tax return using their Social Security number, and the IRS verifies this number against Social Security Administration records.
  • The child must have lived with you for more than half the tax year (more than 183 days), and you must have paid more than half their total living expenses for that year.
  • Your income must fall below a threshold — $400,000 for married filing jointly, $200,000 for single filers — or the credit phases out and may disappear entirely.
  • If you have no tax liability (you owe zero federal income tax), you may still receive part of the credit as a refund through the Additional Child Tax Credit, but only if your earned income exceeds $2,500.

The Four Conditions the IRS Checks

The first condition is relationship. You must be the child's parent, stepparent, foster parent, or legal guardian. Aunts, uncles, grandparents, and other relatives can claim a child only if they have legal guardianship or if the child's parents are deceased or incarcerated. The IRS does not ask for a guardianship document on the return itself, but if you claim a child who is not your biological or legally adopted child, you should be prepared to show proof if the IRS contacts you.

The second condition is residence. The child must have lived with you for more than half the tax year. "Lived with you" means the same household; temporary absences for school, medical care, military service, or vacation do not break the requirement. If a child was born partway through the year, they only need to have lived with you for the rest of that year. If a child turned 17 during the year, you can still claim them for that year.

The third condition is support. You must have paid more than half the child's total living costs for the year. This includes food, lodging, utilities, clothing, medical care, education, and transportation. It does not include the child's own income (from a job or investments). If a child received a scholarship for school, that counts toward their own support, not yours. If you and another person (such as a former spouse) both contributed to the child's support, you must have paid more than 50 percent of the total.

The fourth condition is citizenship. The child must be a U.S. citizen, national, or resident alien on December 31 of the tax year. A resident alien is someone with a green card or who meets the substantial presence test (generally, being in the U.S. for at least 31 days in the current year and 183 days over a three-year period). The IRS checks this against immigration records using the child's Social Security number.

Income Limits and How the Credit Phases Out

The Child Tax Credit is not available to everyone, regardless of how many children they have. It begins to shrink once your modified adjusted gross income (MAGI) exceeds a threshold. For the 2023 tax year, the threshold is $400,000 for married couples filing jointly, $200,000 for single filers, and $200,000 for heads of household. These thresholds do not change year to year; Congress set them in 2017 and has not updated them since.

Once your income exceeds the threshold, the credit reduces by $50 for every $1,000 (or fraction thereof) over the limit. If your income is $400,050 and you are married filing jointly, you lose $50 of the credit. If your income is $401,000, you lose $100. This means that at high enough income, the credit disappears entirely. A single filer with income of $240,000 or more receives no credit.

MAGI for this purpose is usually your adjusted gross income (AGI) from your tax return, but it can be higher if you have certain types of income. If you are unsure whether you are over the threshold, calculate your AGI first, then check the IRS instructions for Form 1040 to see if any adjustments explore to you.

How to Report the Child on Your Tax Return

You report the child on Form 1040 in the section labeled "Dependents." You must provide the child's full legal name, Social Security number, date of birth, and relationship to you. The Social Security number is critical — if you provide an incorrect number, the IRS will not match it to the child in their records, and the credit will be denied or delayed.

If the child does not have a Social Security number, you can explore for one through the Social Security Administration. You will need the child's birth certificate, proof of citizenship or legal residency, and proof of your identity. The process takes about two weeks. You cannot claim the credit without a valid Social Security number for the child.

Once you have reported the child as a dependent, the credit appears on Schedule 8812 (Credits for may have access to Children and Other Dependents) if you are also claiming other credits, or it may be calculated directly on Form 1040 depending on your situation. You do not need to fill out a separate form just for the Child Tax Credit; it is part of your regular tax return filing.

What Happens If You Have No Tax Liability

If your income is low enough that you owe no federal income tax, you might still receive money from the Child Tax Credit through the Additional Child Tax Credit (also called the refundable portion). This is reported on Schedule 1040-C. However, you can only claim the refundable portion if your earned income for the year is at least $2,500. Earned income means wages from a job, self-employment income, or other work-related earnings; it does not include investment income, Social Security, or unemployment benefits.

The refundable portion is limited to 15 percent of your earned income above $2,500, up to a maximum of $1,700 per child (as of 2023). This means if you earned $10,000 and have one child, your refundable credit is 15 percent of $7,500, which is $1,125. If you earned $15,000, your refundable credit is 15 percent of $12,500, which is $1,700 (the maximum). The exact maximum changes each year with inflation.

If you have no earned income, you cannot claim the refundable portion, even if you have children. You can still claim the non-refundable portion (up to the amount of tax you owe), but you will not receive a refund.

Common Reasons the IRS Denies or Delays the Credit

The most common reason for denial is a mismatched or missing Social Security number. If you provide a number that does not match the child's name in Social Security records, or if you leave the number blank, the IRS will reject the credit. Always double-check the number before you file.

The second common reason is that the child does not meet the age requirement. The child must be under 17 at the end of the tax year. If the child turned 17 on December 31, they do not may have access to for that year. If they turn 17 on January 1 of the following year, they do may have access to.

A third reason is that someone else has already claimed the child. If a child's parents are divorced or separated, only one parent can claim the child in a given year. If both parents file claiming the same child, the IRS will contact both of you and may deny the credit to both until you provide documentation of custody or a court order showing who has the right to claim the child.

Income over the threshold is another reason. If your income exceeds the limit for your filing status, the credit will be reduced or eliminated. There is no exception for families with many children or high expenses.

If the IRS Questions Your Claim

If the IRS sends you a notice saying the credit was denied or reduced, the letter will explain the reason. Common reasons are a mismatched Social Security number, income over the limit, or a duplicate claim (another person claimed the same child). You have the right to respond to the notice within 30 days.

If the issue is a Social Security number mismatch, contact the Social Security Administration to verify the number is correct in their records. If the issue is a duplicate claim, you may need to provide documentation (such as a custody order or birth certificate) showing you are the correct person to claim the child. If the issue is income, you can provide documentation of your actual income for that year.

You do not need to hire a tax professional to respond, but if the notice is confusing or you are unsure how to reply, the IRS Taxpayer Advocate Service offers free help. You can contact them through the IRS website or by calling 1-877-777-4778.

Frequently Asked Questions

Can I claim the credit if the child's other parent also files a tax return?

No. Only one parent can claim a child in a given year. If you are divorced or separated, the parent with custody usually has the right to claim the child, but the other parent can claim the child if the custodial parent signs Form 8332 releasing the right. If both parents file claiming the same child without this form, the IRS will deny the credit to both and ask for proof of who should claim the child.

What if the child lived with me for only part of the year?

The child must have lived with you for more than half the year (more than 183 days). If the child was born during the year, count only the days after birth. If the child moved out partway through the year, count the days they were present. Temporary absences for school or medical care do not break the requirement.

Do I lose the credit if my income goes up during the year?

The credit is based on your income for the entire tax year, not your income at the time you file. If your income for the year exceeds the threshold, the credit is reduced or eliminated, even if you earned most of that income late in the year. You cannot claim the full credit and then repay part of it if your income rises.

Can I claim the credit if the child is not a U.S. citizen?

Only if the child is a resident alien (has a green card or meets the substantial presence test). A child who is a citizen of another country and does not have a green card or resident alien status does not may have access to. The child must have a valid Social Security number, which is only issued to citizens, nationals, and resident aliens.

What if I cannot find the child's Social Security number?

Contact the Social Security Administration at 1-800-772-1213 or visit your local Social Security office. You will need the child's birth certificate and proof of citizenship or legal residency. If the child does not have a number, you must explore for one before you can claim the credit. The process takes about two weeks.