Disability criteria depend on which system you’re applying through, but most people searching this question want to know about Social Security disability benefits. The core requirement: you must have a physical or mental condition that prevents you from working and that has lasted, or is expected to last, at least 12 consecutive months or result in death. Beyond that medical standard, your age, income, work history, and assets all factor into whether you qualify.
The Social Security Definition of Disability
Social Security uses a strict, all-or-nothing definition. Unlike some programs that recognize partial disability, Social Security considers you disabled only if you cannot engage in “substantial gainful activity” because of a medically determinable condition. In 2025, substantial gainful activity means earning more than $1,620 per month (or $2,700 if you’re legally blind). If you’re currently earning above that threshold, your claim will be denied regardless of how severe your condition is.
Your condition must also meet the duration requirement. It needs to have lasted or be expected to last for at least 12 consecutive months. A broken leg that heals in six months won’t qualify, even if it completely prevents work during that time. A condition expected to result in death meets the duration requirement automatically.
SSDI vs. SSI: Two Programs, Different Rules
Social Security runs two separate disability programs with the same medical criteria but different financial requirements. Social Security Disability Insurance (SSDI) is based on your work history. You earn eligibility by paying into the system through payroll taxes over the years. If you’ve worked long enough and recently enough, SSDI is available regardless of your savings or other household income.
Supplemental Security Income (SSI) is a needs-based program for people with limited income and resources. To qualify, your countable assets can’t exceed $2,000 as an individual or $3,000 as a couple. This includes bank accounts, stocks, and most property, though your primary home and one vehicle are typically excluded. Many applicants apply for both programs simultaneously.
How Social Security Evaluates Your Claim
Social Security follows a five-step process to decide if you’re disabled. First, they check whether you’re working above the earnings limit. Second, they assess whether your condition is “severe,” meaning it significantly limits basic work activities like lifting, standing, walking, sitting, or remembering. Third, they compare your condition against their official list of qualifying impairments.
That list, known as the Blue Book, covers 14 categories of conditions organized by body system:
- Musculoskeletal disorders (back injuries, joint problems, amputations)
- Neurological disorders (epilepsy, multiple sclerosis, Parkinson’s)
- Mental disorders (depression, anxiety, schizophrenia, autism)
- Cancer
- Cardiovascular conditions (heart failure, coronary artery disease)
- Respiratory disorders (COPD, asthma, cystic fibrosis)
- Immune system disorders (lupus, HIV, inflammatory arthritis)
- Digestive, endocrine, skin, blood, kidney, vision, hearing, and speech disorders
- Congenital disorders affecting multiple body systems
If your condition matches a Blue Book listing with the required severity and test results, you’re approved at step three. Most claims don’t match a listing exactly, though, which pushes the evaluation to steps four and five.
What Happens When You Don’t Match a Listing
At step four, Social Security assesses your “residual functional capacity,” which is essentially a detailed profile of what you can still do despite your condition. This covers physical abilities like how long you can sit, stand, or walk, how much you can lift, and whether you can reach, bend, or crouch. It also covers mental abilities: whether you can understand and follow instructions, maintain focus throughout a workday, and handle interactions with supervisors and coworkers. Sensory limitations and environmental restrictions (such as needing to avoid temperature extremes or fumes) are evaluated too.
If your residual capacity allows you to perform any of your past jobs, your claim is denied. If it doesn’t, the evaluation moves to step five, where Social Security asks whether any other jobs exist in the national economy that you could do given your limitations.
How Age Affects Your Chances
Age plays a surprisingly large role in disability decisions. Social Security uses a set of guidelines that combine your medical limitations with your age, education level, and work experience. These guidelines become significantly more favorable as you get older.
If you’re 55 or older with no transferable skills and can no longer do your past work, the guidelines generally direct a finding of disabled, even if you could technically perform some sedentary tasks. For people between 50 and 54 with no relevant work skills, a disability finding is also the usual outcome when past work is no longer possible. Below 50, the burden is much heavier. You essentially need to prove that no job in the entire national economy could accommodate your limitations.
What Medical Evidence You Need
Social Security requires objective medical evidence from an acceptable medical source, meaning a licensed physician, psychologist, or other qualified provider. Self-reported symptoms alone won’t establish a disability. The evidence needs to document the nature and severity of your condition, how long you’ve had it, and specifically what work-related activities you can and cannot perform.
Strong claims typically include diagnostic imaging, lab results, treatment records showing ongoing care, and detailed statements from your doctors about your functional limitations. If your medical records are insufficient, Social Security may send you to one of their own doctors for a consultative examination. That exam will assess your chief complaints, relevant test results, a diagnosis, and a detailed statement about what you can still physically and mentally do in a work setting.
VA Disability Uses a Different System
If you’re a veteran, the Department of Veterans Affairs uses an entirely separate framework. VA disability is rated on a scale from 0% to 100% in increments of 10, and the rating reflects the average loss in earning capacity caused by conditions connected to your military service. You can receive partial compensation at lower ratings, unlike Social Security’s all-or-nothing approach.
A 100% VA rating means your condition makes it impossible for an average person to maintain gainful employment. But you can also receive a total disability rating at less than 100% on the schedule if you have one service-connected condition rated at 60% or more, or multiple conditions with at least one rated at 40% and a combined rating of 70% or more, and you’re unable to work because of those conditions. One key difference from Social Security: the VA cannot consider your age when rating service-connected disabilities.
The ADA Defines Disability Differently
The Americans with Disabilities Act uses a broader definition that protects people from discrimination, rather than determining benefit eligibility. Under the ADA, you have a disability if you have a physical or mental impairment that substantially limits one or more major life activities, you have a history of such an impairment, or others regard you as having one. This means someone with a well-managed condition, or even someone wrongly perceived as disabled, can still receive legal protections against workplace discrimination. Qualifying under the ADA does not automatically qualify you for Social Security benefits, and vice versa.