The one-sentence version
Everywhere else in your case, only the last four digits of your SSN appear. Form 121 is the single document where your full number lives — and it's filed under seal so the trustee can verify your identity without exposing it to the world.
What's on the form
One page. It lists:
- Your full nine-digit Social Security number (or your ITIN, if you have one instead of an SSN).
- Any other SSNs you have used within the last 8 years. This matters for people who were issued a number, then assigned a different one due to identity-theft remediation, or who have used a temporary number in the past.
- Your name and signature.
How "filed under seal" actually works
When the court receives Form 121:
- It is not uploaded to the public CM/ECF docket where the rest of your case lives.
- The trustee gets a copy so they can verify your identity at the 341 meeting against a government ID.
- The U.S. Trustee program gets a copy for system matching.
- After the 341 meeting, most courts destroy or restrict access to the paper original; many districts now accept it electronically through a separate sealed channel.
At the 341 meeting, the trustee will ask to see your photo ID and your Social Security card (or a tax document, W-2, or other government-issued SSN proof). They compare what's on the card to Form 121. That's the entire purpose of the form — proof your identifying number is real and yours.
Good to know: If you don't have your Social Security card, acceptable substitutes typically include a W-2, a 1099 with your full SSN, an SSA letter, a tax return transcript, or a Medicare card. The exact list varies slightly by trustee — check the trustee's website after your case is assigned.
What if you have an ITIN instead of an SSN?
Non-citizens who file U.S. tax returns but aren't eligible for an SSN have an Individual Taxpayer Identification Number. Form 121 has a box for that — you check "ITIN" and enter the number. Verification at the 341 meeting uses your ITIN assignment letter plus a passport or other government photo ID.
What if you've never had an SSN at all?
Rare but possible — check the box that says "I do not have a Social Security number or an ITIN" and explain in the space provided. The trustee will then use other identifying documents at the meeting. This sometimes applies to certain religious-objector filers and to non-resident individuals who have never worked or filed taxes in the U.S.
Common mistakes
- Putting your full SSN on the petition (Form 101) or schedules. Only the last four go there. The full number goes here, on 121, only.
- Forgetting prior SSNs. If you were issued a replacement number after identity theft, both numbers go on this form.
- Bringing the wrong ID to the 341 meeting. A driver's license alone is not enough — you need photo ID and SSN proof. Showing up with only one will reschedule the meeting.
- Mailing 121 with the rest of the package in a way that lands it on the public docket. Some pro se filers staple it to the petition; check your court's local rules — most require it to be filed separately and clearly marked.
Watch out: Federal Rule of Bankruptcy Procedure 9037 redacts SSNs from the public record. If your full SSN accidentally appears on any other filed document, you (or the clerk) need to file a motion to redact it as soon as it's discovered.
Related forms
Form 121 is paired with the Voluntary Petition (Form 101) and is verified against you in person at the 341 meeting along with photo ID. See the complete forms index.