Do I have to provide my Social Security Number?
Section 6039E of the Internal Revenue Code (26 U.S.C. 6039E) requires you to provide your Social Security Number (SSN), if you have one, when you apply for a U.S. passport or renewal of a U.S. passport. If you have not been issued a SSN, enter zeros in box 5 of the passport application form you are completing. Contact the Social Security Administration to request a Number. If you are residing abroad, you must also provide the name of the foreign country in which you are residing. The U.S. Department of State must provide your SSN and foreign residence information to the Department of Treasury. If you fail to provide the information, you are subject to a $500 penalty enforced by the IRS. All questions on this matter should be directed to the nearest IRS office.