Someone used my child's Social Security number on a tax return. What do I do?

What does it mean if my child's SSN was already used?

It means the SSN appears on another accepted federal tax return for the same tax year. The child may have been listed as a dependent, or the SSN may have been used in another role on a return.

This can result from:

• another parent or relative claiming the child,
• the child filing their own return,
• a typing error on another return, or
• possible identity theft.

What should I check first?

1. Compare the SSN on your return with the child's Social Security card.
2. Confirm the child's name and date of birth are correct.
3. Ask whether another parent, relative or the child filed a return.
4. Review whether anyone else is legally entitled to claim the child.

What does IND-507-01 mean?

IND-507-01 means the dependent's SSN was already used on another accepted return for the same tax year.

The IRS says to verify the dependent's SSN first. If the SSN is correct, a valid IP PIN is required to e-file the second return.

Read the IND-507-01 guide →

Can I still file my return?

Yes. For tax year 2024 and later, the IRS allows certain duplicate-dependent returns to be e-filed if the primary taxpayer on the second return includes a valid current-year IP PIN.

If you do not obtain or use an IP PIN, a paper return may be required depending on the year and situation.

Does my child need an IP PIN?

Not solely because the child's SSN was already used. But if the IRS previously issued an IP PIN to the child, that dependent IP PIN must be included where required on the e-filed return.

Can the IRS tell me who used my child's SSN?

Generally, no. The IRS says federal privacy law prevents it from telling you who claimed a dependent when the child is listed only as a dependent on the other return.

The IRS also says a parent generally cannot request a copy of a fraudulent return that merely lists the child as a dependent, because the child is not the primary or secondary taxpayer on that return.

When should I suspect identity theft?

If you verified the SSN, no one else should be entitled to claim the child, and you do not recognize anyone who could have used the SSN, the IRS says the dependent may be a victim of identity theft.

Review the IRS dependent identity-theft guidance and any instructions in the rejection or notice you received.

What if I get Notice CP87A?

CP87A means the IRS received another tax return claiming the same dependent or qualifying child SSN.

The IRS says to:

• compare the SSN on the notice with the Social Security card,
• review whether you are entitled to claim the dependent, and
• do nothing if you correctly claimed the child.

If you determine you were not entitled to claim the child, the IRS says to correct your return with Form 1040-X.

Do I send proof with my return?

No. The IRS specifically says not to attach extra documents to the return just to prove that you can claim the dependent. If proof is needed, the IRS will contact you later.

What happens if the IRS investigates?

The IRS may later ask both taxpayers to reconsider the dependency claim. If neither taxpayer corrects the return, the IRS can audit the issue and ask for documents showing who is entitled to claim the dependent.

Keep records such as school, medical, daycare or social-service documents showing the child's address and relationship to you.

Step-by-step before resubmitting

1. Save the complete rejection message.
2. Verify the child's SSN against the Social Security card.
3. Confirm whether anyone else could legitimately claim the child.
4. If you are entitled to claim the child, review the current IP PIN e-file option.
5. If you suspect identity theft, follow the IRS dependent identity-theft guidance.
6. Do not attach proof documents unless the IRS later requests them.
7. Keep records supporting your dependent claim.

Common questions

Does an SSN already used rejection automatically mean identity theft?

No. It can also happen because another parent or relative claimed the child, the child filed their own return, or another return contains a typo.

Can I get a copy of the other return?

Generally not when your child is listed only as a dependent. The IRS says privacy law limits disclosure of another taxpayer's return information.

Can RefundIQ help me file if my child's SSN was already used?

Yes. RefundIQ can review the rejection and current filing options, prepare or correct the return, and help get it transmitted using the appropriate method.

Go to the RefundIQ Dependent Rejection Help Center →

Someone already claimed my dependent →

SSN already used guide →

Related next steps: review the conditional Form 14039 guide before reporting; the current form excludes tax-filing misuse by a parent or guardian. For filing protection, see how to get an IP PIN for a child and whose IP PIN a dependent return needs.