How does Social Security define disability for benefits? Answer in under 100 words. Cite only eCFR (www.ecfr.gov) sources.
Details / How it works
Per 20 CFR 404.1505(a), you must have a severe impairment(s) that makes you unable to do your past relevant work (see § 404.1560(b)) or any other substantial gainful work that exists in the national economy. The Social Security Administration (SSA) applies a five-step sequential evaluation process under 20 CFR 404.1520: (1) work activity/SGA; (2) medical severity; (3) whether the impairment meets or equals a listing in Appendix 1; (4) residual functional capacity (RFC) versus past relevant work; and (5) RFC plus age, education, and work experience to determine adjustment to other work. Entitlement to Title II disability insurance benefits is governed by 20 CFR 404.315, which requires disability insured status (quarters of coverage per § 404.130), a filed application (Form SSA-16 or equivalent), a disability as defined in § 404.1505, and a 5-month waiting period (waived for certain ALS cases under the ALS Disability Insurance Access Act of 2019).
Numbers & thresholds
| Element | Threshold / Value | Source |
|---|---|---|
| Duration requirement | Continuous period of not less than 12 months (or result in death) | 20 CFR 404.1505(a) |
| Number of evaluation steps | 5 sequential steps | 20 CFR 404.1520(a)(4) |
| Past relevant work lookback | 15 years | 20 CFR 404.1520(a)(4)(iv) |
| Waiting period for DIB | 5 full consecutive months (waivable in specific circumstances) | 20 CFR 404.315(a)(4) |
| Earliest waiting-period start | No earlier than 17th month before the month you apply | 20 CFR 404.315(a)(4) |
| ALS waiting-period waiver | Approved applications on or after July 23, 2020 | 20 CFR 404.315(a)(4)(ii) |
| Five-year recency rule | Previously entitled to DIB/period of disability within 5 years | 20 CFR 404.315(a)(4)(i) |
Exceptions & edge cases
- Statutory blindness: Different rules apply under §§ 404.1581–404.1587 (20 CFR 404.1505(b)).
- Pre-1991 widow(er) cases: Special rules in §§ 404.1577, 404.1578, and 404.1579 govern months prior to January 1991 (20 CFR 404.1505(b)).
- Medical-vocational profiles: Section 404.1562 contains profiles that may direct a finding of disabled based on vocational factors (age, education, work experience) without fully proceeding through the standard evaluation (20 CFR 404.1520(g)(2)).
- Expedited step-four/five process: If evidence about past relevant work is insufficient, the SSA may proceed directly to step five (20 CFR 404.1520(h)).
- ALS: No waiting period is required for applicants medically determined to have amyotrophic lateral sclerosis whose application was approved on or after July 23, 2020 (20 CFR 404.315(a)(4)(ii)).
Sources
- [1]U.S. Government Publishing Office / Social Security Administration — 20 CFR 404.1505 — Definition of disability for Social Security benefits · as of 2026-08-28
- [2]U.S. Government Publishing Office / Social Security Administration — 20 CFR 404.1520 — Five-step sequential evaluation process for disability claims · as of 2026-08-28
- [3]U.S. Government Publishing Office / Social Security Administration — 20 CFR 404.315 — Who is entitled to Social Security disability insurance benefits · as of 2026-08-28
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