The SSDI Adult Function Report: What It Is and Why It Matters

When you apply for Social Security Disability Insurance, the SSA isn't just looking at your diagnosis. They want to understand how your condition affects what you can actually do — day to day, hour to hour. That's where the Adult Function Report comes in.

Officially called Form SSA-787 (though claimants typically complete Form SSA-3373), the Adult Function Report is a questionnaire the Social Security Administration uses during the disability review process. It's one of the most important documents in your file, and how you complete it can significantly shape how a reviewer understands your limitations.

What the Adult Function Report Actually Asks

The form covers a wide range of daily activities and functional abilities. SSA reviewers use it to build a picture of your residual functional capacity (RFC) — meaning what you're still able to do despite your condition.

Expect questions in these general areas:

• Personal care — Can you dress yourself, bathe, prepare meals, or manage medication independently?
• Daily tasks — Do you handle household chores, shop, drive, or manage finances?
• Social functioning — How do you interact with others? Do you avoid crowds, have trouble concentrating, or experience mood episodes?
• Physical abilities — How long can you sit, stand, walk, or lift before symptoms worsen?
• Sleep and routine — Does your condition disrupt your sleep or prevent you from maintaining a regular schedule?

You may also be asked to explain how your condition has changed these abilities compared to before your illness or injury began.

Who Fills It Out — and Why That Matters

In most cases, the claimant completes the form themselves. However, the SSA may also ask a third party — a spouse, caregiver, friend, or family member — to fill out a separate version called the Adult Function Report – Third Party (SSA-787). This third-party account can corroborate (or contradict) what the claimant reports.

Both versions carry weight. Reviewers at Disability Determination Services (DDS) — the state-level agencies that make initial disability decisions — cross-reference these reports against medical records, physician notes, and other evidence in your file.

How the SSA Uses This Form 📋

The Adult Function Report feeds directly into the SSA's five-step sequential evaluation process — particularly Steps 4 and 5, where reviewers assess whether you can perform your past work or any other work that exists in the national economy.

Your answers help shape your RFC, which is essentially a ceiling on what type of work the SSA believes you can sustain. RFCs are categorized by exertional level:

Non-exertional limitations — like difficulty concentrating, handling stress, or being around others — are also documented through this form and factored into RFC decisions.

Common Mistakes That Hurt Claims

A few patterns consistently undermine Adult Function Reports:

Minimizing symptoms. Many claimants describe what they can do on a good day rather than what a typical day actually looks like. The SSA wants to understand your baseline, not your best-case scenario.

Being vague. Answers like "I have trouble walking" are less useful than "I can walk about half a block before the pain forces me to stop." Specificity helps reviewers and, later, administrative law judges (ALJs) understand your functional limits.

Inconsistency with medical records. If your doctor's notes document severe fatigue, but your function report suggests you manage a full daily routine without difficulty, that gap raises questions. The opposite is also true — if your records are sparse but your form describes extreme limitations, reviewers may weigh the medical evidence more heavily.

Forgetting fluctuation. Many conditions — mental health disorders, autoimmune conditions, chronic pain syndromes — don't follow a straight line. Describing your worst days alongside your average days gives a more accurate picture than either extreme alone.

What Happens After You Submit It 🗂️

The Adult Function Report is reviewed alongside your medical records, treatment history, and any opinions from your treating physicians. At the initial application stage, DDS examiners use it to make an initial determination. If your claim is denied and you request reconsideration, the form remains part of your file.

If your case reaches an ALJ hearing, the judge will almost certainly have reviewed your Adult Function Report. Inconsistencies between what you wrote and what you say at the hearing can become a credibility issue. ALJs are trained to look for patterns, and the function report is one of the earliest records in the file.

The Variables That Shape Individual Outcomes

No two function reports lead to the same result, because no two claimants have identical circumstances. What a reviewer concludes from your report depends on:

• The nature and severity of your condition — physical, mental, or both
• Your age — the SSA's Medical-Vocational Guidelines weigh age differently for claimants over 50
• Your work history — the skills and demands of your past jobs affect how your RFC translates to a disability finding
• The quality of your supporting medical evidence
• How thoroughly and accurately you complete the form

A claimant with well-documented medical records, a consistent treatment history, and a detailed, specific function report is in a different position than someone with sparse records and a vague submission — even if their conditions are similar on paper.

The Adult Function Report is one piece of a larger puzzle. How that piece fits depends entirely on what the rest of your file looks like and how your specific limitations map onto SSA's evaluation criteria.