If someone else has already claimed your child as a dependent, the fix is to file your own return claiming the child and then report the other filer to the IRS. To report someone claiming your child on their taxes, submit Form 3949-A, Information Referral, when you know or suspect who did it (an ex, a relative, a former roommate), or Form 14039, Identity Theft Affidavit, when the person is a stranger who used your child’s Social Security number without your knowledge. Filing your own return is what actually opens the dispute; the referral form tells the IRS you believe the other claim was improper.
File Your Own Return First
Nothing happens on the IRS side until your return is in the system. A rejected e-file is not a filed return, so if your e-file bounces back because your child’s SSN already appears on another return, keep going.
First, check that you typed the SSN correctly. Typos cause a surprising number of these rejections. If the number is right, you have two ways to still get the return filed:
- Obtain an Identity Protection PIN (IP PIN) for the primary taxpayer on the return. With a current-year IP PIN, you can e-file even when the dependent’s SSN was already used on another return.
- Paper-file. Print the completed return, sign it, and mail it to the IRS service center listed in the form instructions. For prior tax years, paper filing is the only option.
Do not attach documentation proving your right to claim the child. If the IRS needs records, it will ask for them later.1Internal Revenue Service. Age, Name or SSN Rejects, Errors, Correction Procedures
Which Form to Use to Report the Other Person
Filing your return signals a dispute. Reporting the other person is a separate step, and the right form depends on whether you know who they are.
Form 3949-A, Information Referral. Use this when you know or reasonably suspect who claimed your child. Form 3949-A is the IRS’s general channel for reporting suspected tax fraud, including false exemptions, false deductions, and Earned Income Credit violations. You can fill it out and submit it directly on the IRS website.2Internal Revenue Service. About Form 3949-A – Information Referral
Form 14039, Identity Theft Affidavit. Use this when a stranger used your child’s SSN and you have no idea who. Parents can file Form 14039 on behalf of a dependent child whose SSN was used without permission.3Internal Revenue Service. When to File an Identity Theft Affidavit
One exception applies to both forms: if the IRS has already contacted you with Letter 5071C, 4883C, or 5747C, follow the instructions in that letter rather than filing either form on your own.3Internal Revenue Service. When to File an Identity Theft Affidavit
Confirm You Actually Qualify to Claim the Child
Before you file and report, walk through the IRS rules. Losing a dispute you started can cost you the tax owed, interest, penalties, and a multi-year ban from certain credits.
The Four Qualifying Child Tests
A qualifying child must meet all four:
- Relationship. Your son, daughter, stepchild, adopted child, foster child, sibling, half-sibling, stepsibling, or a descendant of any of those (grandchild, niece, nephew).
- Age. Under 19 at year-end, or under 24 if a full-time student for at least five months of the year. No age limit if the child is permanently and totally disabled.
- Residency. The child lived with you for more than half the year.
- Support. The child did not provide more than half of their own financial support during the year.
The child also cannot file a joint return with a spouse, except solely to claim a refund.4Office of the Law Revision Counsel. 26 U.S.C. 152 – Dependent Defined If you are raising a grandchild or niece full-time, you can still qualify as long as the other tests are met.5Internal Revenue Service. Dependents
Tie-Breakers When Two People Both Qualify
When more than one person passes all four tests for the same child, the IRS applies these rules in order:
- A parent beats a non-parent.
- Between two parents not filing jointly, the one with whom the child lived more nights wins.
- If the nights are equal, the parent with the higher adjusted gross income wins.
- If no parent claims the child, the non-parent with the higher AGI wins.
The outcome usually turns on where the child slept most nights and, in a tie, on income.6Internal Revenue Service. Tie-Breaker Rule
Divorced or Separated Parents
The custodial parent (the one with more overnights) holds the default right to claim the child. That parent can release the claim to the noncustodial parent by signing Form 8332, Release/Revocation of Release of Claim to Exemption for Child by Custodial Parent, which the noncustodial parent must attach to their return every year they claim the child.7Internal Revenue Service. Form 8332 – Release/Revocation of Release of Claim to Exemption for Child by Custodial Parent
A divorce decree or custody order telling the noncustodial parent they can claim the child does not substitute for Form 8332, with a narrow exception for certain decrees executed before 2009. Without a signed Form 8332, the tie-breakers work in the custodial parent’s favor.8Internal Revenue Service. About Form 8332 – Release/Revocation of Release of Claim to Exemption for Child by Custodial Parent
Evidence to Have Ready
The IRS eventually asks one or both parties to prove the child lived with them. Residency decides most of these cases. Start gathering records the moment you learn about the other claim, because the response window on an IRS notice is short.
- School enrollment forms or report cards showing your home address
- Medical or dental records listing your address as the child’s residence
- Daycare or childcare provider statements
- A letter from a landlord, property manager, or social services agency confirming the child lived with you
- Insurance records, religious organization records, or official correspondence addressed to the child at your home
What Happens After You File
Once the IRS processes your paper return and matches your child’s SSN to another return, both filers usually receive Notice CP87A. The notice tells each person that another taxpayer claimed the same dependent. It does not name the other filer.9Internal Revenue Service. Understanding Your CP87A Notice
The notice sets a response deadline. If you are confident in your claim, you do not amend your return; you respond by the deadline with copies of your residency evidence. Ignore the deadline and the IRS may disallow your claim by default.
The IRS then reviews both parties’ evidence and decides who qualifies. This is a narrow inquiry, not a full audit, but it is slow. Paper returns can take six months or more to process in busy periods, and the dispute investigation adds time on top of that. Any refund tied to the dependent claim stays on hold until the IRS resolves the issue.10Internal Revenue Service. Identity Theft Dependents
Consequences for Whoever Loses
The person whose claim is disallowed has their return adjusted and owes back the benefits they received, including any Child Tax Credit (worth up to $2,200 per child for tax year 2025), Earned Income Tax Credit, and head-of-household filing status benefits.11Internal Revenue Service. Tax Credits for Individuals The IRS charges interest from the original due date. It can also impose an accuracy-related penalty equal to 20% of the underpaid tax when the claim resulted from negligence or disregard of the rules.12Office of the Law Revision Counsel. 26 U.S.C. 6662 – Imposition of Accuracy-Related Penalty on Underpayments
Repeat or willful misconduct adds credit bans. Reckless or intentional disregard of the rules triggers a two-year ban from the Child Tax Credit. Fraud extends the ban to ten years, and similar bans apply to the Earned Income Tax Credit. After any disallowance, the taxpayer has to provide additional documentation before claiming the credit again.13Office of the Law Revision Counsel. 26 U.S.C. 24 – Child Tax Credit
These consequences run both ways. If the IRS decides the other person had the better claim, you owe the difference plus interest, and penalties or credit bans can follow if the IRS finds your claim was reckless or fraudulent.
Block It Next Year With an IP PIN
Once the dispute is resolved, enroll your child in the IRS Identity Protection PIN program. An IP PIN is a six-digit number the IRS issues each year. Any return listing your child as a dependent must include their correct IP PIN, or the IRS rejects it. That stops unauthorized claims before they land in the system.14Internal Revenue Service. Get an Identity Protection PIN (IP PIN)
Parents can request an IP PIN on behalf of dependent children. Children under 18 cannot use the standard online enrollment. Instead, submit Form 15227 online or schedule an in-person appointment at a local Taxpayer Assistance Center, and bring two forms of ID for the child, such as a birth certificate and Social Security card.14Internal Revenue Service. Get an Identity Protection PIN (IP PIN)
If the Case Stalls
Dependent disputes can run for months, and any refund tied to the claim stays frozen the whole time. If the delay is causing financial hardship, or the IRS has missed a promised response by more than 30 days, contact the Taxpayer Advocate Service at 1-877-777-4778. TAS is an independent organization within the IRS that helps taxpayers resolve problems they cannot fix through normal channels and prioritizes cases involving economic harm, imminent adverse IRS action, or systemic processing delays.