Child tax credit SSN requirement: rules for children, parents and ITIN filers

The child tax credit SSN requirement in brief

To claim the $2,200 child tax credit or the refundable additional child tax credit on a 2026 return, both the child and the person claiming the credit must meet an identification test. The IRS states on its child tax credit page that the number must be valid for employment in the United States and issued before the due date of the return, including extensions.

The child's SSN rule is not new; it has applied since 2018. What changed with the 2025 tax law is the filer rule. Before 2025, a parent with only an ITIN could still claim the credit for a child who had an SSN. Starting with 2025 returns, that parent needs a valid SSN, or a spouse with one on a joint return, according to Publication 505.

Valid SSN for child tax credit: the rule for children

Each child counted on Schedule 8812 line 4 must have a valid SSN. An ITIN or an adoption taxpayer identification number (ATIN) does not qualify the child for the $2,200 credit, even if every other test is met. Such a child moves to line 6 and is worth $500 instead, as explained on the credit for other dependents page.

• Newborns: most parents request an SSN at the hospital as part of the birth registration. If you did not, file Form SS-5 with the Social Security Administration with proof of birth, citizenship and identity.
• Children being adopted: if the adoption is not final and you cannot get an SSN in time, Form W-7A gives an ATIN. It supports the $500 credit, not the CTC. Once the SSN arrives, the full credit applies from that year forward. See the adoption credit for 2026 for the related adoption rules.
• Child born and died in the same year: if no SSN was issued, attach a copy of the birth certificate, death certificate or hospital records showing a live birth, and you can still claim the credit.

Do parents need an SSN for the child tax credit?

Yes, for 2025 and later returns. The filer claiming the CTC or ACTC must hold an SSN that is valid for employment and was issued by the due date of the return, including extensions. This applies to original and amended returns alike, so amending a 2025 or 2026 return does not get around it.

An SSN card printed with "Not valid for employment" is issued only so a person can receive certain federal benefits, and it does not meet the employment test. If your immigration status has since changed, ask the Social Security Administration for a replacement card without that legend before you file.

Can an ITIN holder claim the child tax credit?

Not on their own. A single parent or head of household filer with only an ITIN cannot claim the CTC or the ACTC, even if every child has an SSN. That filer can generally still claim the $500 credit for other dependents for each dependent, because the ODC accepts an ITIN for both the filer and the dependent.

What if one spouse has an ITIN? The joint return exception

On a joint return, only one spouse needs a valid SSN. The other spouse must have either an SSN or an ITIN, issued on or before the due date of the return. This exception exists only for joint returns; a spouse filing separately is judged on their own number.

If a couple is eligible to file jointly and only one spouse has an SSN, filing jointly is often the only way to keep the credit. Compare the whole return first, since joint filing also affects the brackets and other credits.

When must the SSN be issued? Deadlines for 2026 returns

The SSN, and any spouse's ITIN, must be issued on or before the due date of the return, including extensions. For a 2026 return, that is April 15, 2027, or October 15, 2027 if you file Form 4868 for an extension. A number issued after that date cannot support the credit for 2026, even on an amended return.

1. Check every card now. Confirm that each number is correct and that no card carries the "Not valid for employment" legend.
2. Apply early. Use Form SS-5 for an SSN. The Social Security Administration needs original documents, so allow several weeks.
3. Extend if the number is late. If an SSN will arrive after April 15, 2027, file Form 4868 by that date so the deadline moves to October 15, 2027. Pay any tax you expect to owe with the extension.
4. File with the $500 credit if needed. A dependent who has an ITIN or ATIN by the deadline can still bring in the credit for other dependents.

Other credits with their own SSN rules

The child tax credit is not the only benefit tied to a valid SSN. From 2026, the American opportunity and lifetime learning credits also require a valid SSN issued by the return due date; see the American opportunity credit page. The new senior, tips and overtime deductions require a valid SSN as well.

The child and dependent care credit has its own identification rules for the child and the care provider, so check that page separately. For the overall eligibility tests and amounts, start with the child tax credit guide.