Documents the Social Security Administration may ask for include:
Your Social Security card or a record of your number.
Your original birth certificate, a copy certified by the issuing agency, or other proof of your age. The SSA must see the original document(s), or copies certified by the agency that issued them. The SSA cannot accept photocopies or notarized copies.
If you were not born in the U.S., proof of U.S. citizenship or lawful alien status. The SSA must see the original document(s), or copies certified by the agency that issued them. The SSA cannot accept documents if they have expired. The SSA cannot accept photocopies or notarized copies.
A copy of your U.S. military service paper(s) if you served before 1968. A photocopy is acceptable.
A copy of your W-2 form(s) and/or self-employment tax return for last year. A photocopy is acceptable.