You must provide your Social Security number, if you have been issued one, on your application for a U.S. passport.
If you do not have a Social Security number, you must submit a statement, signed and dated, that includes the phrase, “I declare under penalty of perjury under the laws of the United States of America that the following is true and correct: I have never been issued a Social Security number by the Social Security Administration.”
Your passport application may be delayed or denied if you do not provide a Social Security number or a statement declaring that a Social Security number has not been issued to you. If you are in the Bosnia and Herzegovina, you should follow the directions on our Social Security Administration page to contact the Federal Benefits Unit in Athens about obtaining a Social Security number and card.
If have an emergency need to travel, but you cannot locate your Social Security number, we may be able to issue you a limited passport for direct return to the United States only.
If you fail to provide the information, you will also be subject to a $500 penalty enforced by the IRS pursuant to Section 6039E of the Internal Revenue Code (26 U.S.C. 6039E). All questions on this matter should be directed to the nearest IRS office.