Your next action depends on the reason your return was rejected. You should receive an explanation of why the return was rejected. If a mistake was made when entering a social security number, omitting a form or a name is misspelled, the errors can be corrected and the return can be sent again to the IRS. There are other errors that will cause you to have to file using a paper return. If you have further questions, you can call our Customer Service number at 1-800-829-1040. For general information about e-file, refer to Electronic Services

Unfortunately, you will need to file a paper return this year. Do not send any documents that are not required with your tax return. Whether the cause of this rejection is the result of a typo on another return or an attempt by another party to claim your dependent, the IRS has security measures in place to ensure the accuracy of returns submitted. In such cases, the IRS will question the dependency exemptions claimed by any other party using the wrong social security number.

References:

• Social Security Administration
• Electronic Services