Disability insurance, explained simply
Disability insurance replaces part of your income if an illness or injury keeps you from working. Here's how short-term and long-term coverage differ, the waiting periods involved, and what "disability" actually means in a policy.
1. The problem it solves
Most people insure their car and their home, but their ability to earn an income — the thing that pays for everything else — often goes unprotected. A serious illness or injury can stop a paycheck for months or years while bills continue. Disability insurance exists to replace a portion of that lost income, not all of it, while you're unable to work.
2. Short-term vs. long-term coverage
| Short-term disability (STD) | Long-term disability (LTD) | |
|---|---|---|
| Elimination period | ~7–30 days | ~90–180 days (often starts when STD ends) |
| Benefit period | ~3–6 months (13–52 weeks) | Several years, or until retirement age |
| Typical income replacement | ~40%–70% of base pay | ~50%–80% of base pay |
The two are often designed to work together: STD covers the earlier weeks of a disability, and LTD's elimination period is timed to begin right as STD benefits run out, creating continuous (though partial) income replacement.
3. How "disability" is actually defined
Whether a policy pays out depends heavily on its definition of disability — a detail easy to overlook until it matters.
Own-occupation
- Pays out if you can't perform the specific duties of your own occupation
- Generally more expensive, but broader — a surgeon who loses fine motor control could still qualify even if able to do other work
Any-occupation
- Only pays out if you can't perform any occupation reasonably suited to your training and experience
- Generally less expensive, but stricter — the same surgeon might not qualify if capable of other paid work
4. Average costs
Figures below come from aggregated 2026 industry analyses (Guardian, Policygenius, Aflac). These are averages only — occupation, health, age, and the definition of disability chosen all move the number.
| Coverage | Approximate cost |
|---|---|
| Long-term disability | ~1%–3% of gross annual income (often ~$25–$75/month for a healthy adult in their 30s) |
| Short-term disability | ~1%–3% of gross annual income |
| Employer-sponsored group coverage | Often just a few dollars per paycheck, since employers commonly cover part or all of the premium |
A detail worth knowing: if an employer pays the premium for group coverage, the disability benefit is generally taxable income; if you pay the premium yourself with after-tax dollars, the benefit is generally received tax-free.
5. Factors that affect cost
6. Myth vs. fact
“Disability insurance is mainly for physically dangerous jobs.” ▼
Myth. Disabling conditions are commonly associated with workplace accidents.
Fact: Most long-term disability claims stem from illness — back injuries, cancer, and other health conditions — not workplace accidents, which affects office workers as well as physically demanding occupations.
“Workers' comp covers me if I become disabled.” ▼
Myth. These two coverages are frequently confused.
Fact: Workers' compensation only applies to injuries or illnesses that happen on the job. Disability insurance applies regardless of where or how the disabling condition occurred.
7. Glossary terms used on this page
Elimination Period
The waiting period between a disabling event and when benefits begin.
Benefit Period
How long disability benefits are paid once they start.
Own-Occupation Definition
Pays out if you can't perform your specific occupation's duties.