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This reject error message can happen if:

• there is a transposed digit in your return
• the number is wrong at the Social Security Administration 
• another person deliberately tries to claim them
• another accidentally enters this social security number for their own child
• someone has filed a fraudulent return including this number.

To find which of your dependents is causing the error, please look at your full Reject Code. The last two digits of the Reject Code show which dependent caused the flag, based on the order they are listed in your Form 1040. 

For example, Reject Code:

• R0000-507-01 - The First Dependent listed on your Tax Return was already Claimed as a Dependent
• R0000-507-02 - The Second Dependent listed on your Tax Return was already Claimed as a Dependent
• R0000-507-03 - The Third Dependent listed on your Tax Return was already Claimed as a Dependent

If the number is accurate in your return, then you will not be able to e-file your return with that dependent entered. Even if it is accurate, it will need to be checked on a paper return. Depending on the difference it makes in the return and if you have a refund or owe taxes, you may:

• Leave the return the way it is and select to print and file by mail. There are significant delays with this method this year due to a carryover of returns not processed yet from last year.
• Delete the dependent from your return and e-file the rest of the information, then after the return is processed, if there are no adjustments from the IRS, you can amend your return and add the dependent, along with any credits which they qualify on the return. This will need to be filed by mail and thus will be delayed but it will not delay the rest of the return.

If you decide to amend, this TurboTax Help article has step-by-step directions to amend your return. Amend 2021 return