This error code means that the IRS rejected your return because a dependent listed has filed their own return without indicating they would be claimed as a dependent.
A dependent's Social Security number (SSN) cannot be used on two separate tax returns.
If you are claiming more than one dependent, review and look for a number in brackets to indicate which dependent is causing the issue. For example: "[2]" will refer to the second dependent from the top.
Verify all dependent information is accurate and correct any misspellings, omissions, or transpositions. Make sure their SSN is correct. If all of these are correct and you want to file this return electronically, you cannot claim them on this return.
To keep the dependent on this return, you need to print and file your return by mail.
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