What the SSDI disability forms are and why you need them

The main form you complete when you explore for Social Security Disability Insurance (SSDI) is called the process for Disability Insurance Benefits, officially Form SSA-16. This is the document that tells Social Security you are requesting disability benefits and provides your basic information — name, date of birth, work history, and the date your disability began. You cannot start the SSDI process without submitting this form, either in person at your local Social Security office, by mail, or online through your Social Security account.

Social Security will also ask you to complete a second form called the Function Report — Adult, officially Form SSA-3373-BK. This form is where you describe how your condition affects your daily life — what you can and cannot do, how far you can walk, whether you can lift things, how you manage household tasks, and whether you work or have tried to work. Social Security uses this form to understand the real-world impact of your disability, not just the medical diagnosis itself.

Depending on your situation, you may also need to complete a Work History Report, which lists your jobs from the past 15 years, what you did in each job, and how long you worked. Social Security uses this to determine whether your past work was substantial and gainful, which affects how they evaluate your case.

Key Takeaways

  • Form SSA-16 (process for Disability Insurance Benefits) is the main form that starts your SSDI case and must be submitted before Social Security will review your claim.
  • Form SSA-3373-BK (Function Report — Adult) asks you to describe how your disability affects your ability to work and manage daily tasks, and Social Security uses it to evaluate your functional limitations.
  • You will likely need to provide a detailed work history covering the past 15 years, including job titles, duties, and dates of employment.
  • Social Security may request additional forms or clarifications after you submit your initial process, and you should respond within the important date they provide.

Where to get the forms and how to submit them

You can obtain SSDI forms directly from Social Security in three ways. The first is to visit ssa.gov and read the forms as PDF files — you can print them, fill them out by hand, and mail them to your local Social Security office. The second is to call Social Security's national helpline at 1-800-772-1213 (TTY 1-800-325-0778) and request that forms be mailed to you. The third is to walk into your local Social Security office in person and ask a representative to give you the forms or help you fill them out on the spot.

The easiest route for most people is to create a my Social Security account at ssa.gov and explore online. When you explore online, Social Security fills in some information automatically (like your name and Social Security number from their records), and you answer questions about your work history, medical condition, and daily functioning. You do not have to print or mail anything. The online process also shows you which fields are required before you can submit.

If you explore in person or by mail, Social Security will send you Form SSA-3373-BK (the Function Report) separately, usually within a few weeks of receiving your initial process. They will include a important date — typically 10 days — for you to return it. If you explore online, you may be able to complete the Function Report as part of the same session, or Social Security may send it to you later depending on your case.

What information you need to gather before you start

Before you sit down to fill out the forms, collect your work history. You will need the names and addresses of your employers, the dates you worked at each job (month and year), your job titles, and a brief description of what you did. If you worked more than 15 years ago, Social Security only requires the past 15 years, but having a complete history can help if there are gaps.

You will also need your medical records and the names and addresses of the doctors, therapists, or other medical providers who have treated you for your disability. Social Security will request these records directly from the providers, but having the contact information ready speeds up the process. If you have already been denied for benefits before, gather those denial letters as well — they contain information Social Security will need to understand your case history.

Have your Social Security number, date of birth, and driver's license or other ID ready. If you are explore online, you will need to verify your identity, which usually means answering security questions or receiving a code by text or email. If you are explore by mail or in person, bring your ID with you.

How the forms connect to the medical evidence Social Security collects

The forms you complete are not the same as your medical evidence, but they trigger Social Security to request it. When you submit Form SSA-16, you list the doctors and hospitals that have treated you. Social Security then sends a request to each of those providers asking for your medical records, test results, imaging, and treatment notes. This process can take several weeks because providers are not required to respond quickly.

The Function Report (Form SSA-3373-BK) is important because it gives Social Security a picture of how your condition affects you in real life. A doctor's note might say "patient reports difficulty walking," but the Function Report lets you explain that you can only walk a few blocks before needing to rest, or that you cannot stand long enough to cook a meal. Social Security uses both the medical records and your description of your limitations to decide whether you meet their definition of disability.

If Social Security needs more information after reviewing your forms and medical records, they may send you to a doctor they choose and pay for — called a consultative examination. This is not a sign that your case is weak; it is a standard step when Social Security needs clarification on a specific issue.

Common mistakes people make when filling out the forms

The most common mistake is downplaying your limitations because you do not want to seem like you are exaggerating. On the Function Report, be specific and honest about what you cannot do. If you cannot work because of pain, fatigue, or cognitive problems, describe that clearly. Social Security is trained to read these forms and will not penalize you for being truthful about your condition.

A second mistake is leaving gaps in your work history or being vague about what you did in past jobs. Social Security needs to know whether your past work was substantial and gainful (meaning you earned enough money and worked consistently). If you list a job but cannot remember the exact dates, write down what you do remember and note that the dates are approximate. Social Security can verify employment through your Social Security earnings record.

A third mistake is not returning the Function Report by the important date. If Social Security sends you Form SSA-3373-BK and you do not return it within the important date they provide, they may close your case. If you cannot meet the important date, call Social Security and ask for an extension — they will usually grant one if you ask.

What happens after you submit the forms

After you submit your initial process (Form SSA-16), Social Security will send you a notice acknowledging receipt. This notice includes a case number and the name of the person assigned to your case. Keep this notice in a safe place; you will need the case number if you call Social Security with questions.

Social Security will then request your medical records from the providers you listed. While they are waiting for those records, they may send you the Function Report if you have not already completed it. Once they receive your medical records, a disability examiner will review your forms, the medical evidence, and your work history to decide whether you meet Social Security's definition of disability.

The entire process typically takes 3 to 6 months, though it can be faster or slower depending on how quickly your medical providers respond and how complex your case is. You will receive a written decision in the mail. If you are approved, the notice will tell you when your benefits begin and how much you will receive each month. If you are denied, the notice will explain why and tell you how to request reconsideration or appeal.

Frequently Asked Questions

Can I fill out the forms online, or do I have to print and mail them?

You can do either. The online process through your my Social Security account is usually faster and easier because it saves your progress and shows you which fields are required. If you prefer to print and mail the forms, you can read them from ssa.gov or request them by phone. Both methods are accepted.

What if I do not remember all my employers from the past 15 years?

Write down what you do remember — the company names, approximate dates, and job titles. Social Security can verify employment through your Social Security earnings record, which shows every employer who reported your wages. If there are gaps, note them and explain if you can (for example, "unemployed" or "self-employed").

Do I need to have all my medical records before I submit the forms?

No. You only need to list the names and addresses of the doctors and hospitals that have treated you. Social Security will request the records directly from those providers after you submit your process. Having the contact information ready speeds up the process, but you do not need to collect the records yourself.

What if I make a mistake on the forms after I submit them?

Call your local Social Security office or the national helpline at 1-800-772-1213 and tell them about the error. They can correct it in your file. Do not submit a second process; that will create confusion. A straightforward phone call to clarify or correct information is the fastest way to fix it.

Can someone else fill out the forms for me?

Yes. A family member, friend, attorney, or advocate can help you complete the forms or fill them out on your behalf. If someone other than you signs the forms, they should write their relationship to you and their contact information. Social Security may contact you directly to verify information, so make sure whoever helps you has your permission to discuss your case.