Disability Insurance Needs Calculator

Most people buy life insurance without a second thought—yet statistically, a 25-year-old worker is more likely to be disabled for 90+ days before retirement than to die. Disabilities cause nearly half of all foreclosures, more than death or divorce. Despite this, only about a third of private-sector workers have long-term disability coverage. If you depend on your income and aren't financially independent, disability insurance is arguably the most important coverage you'll ever buy.

The income-gap formula

Disability insurance replaces the gap between what your household needs and what other sources would provide. The calculation is straightforward:

Monthly need = your after-tax income − spouse income − investment income − other disability income
Recommended benefit = monthly need × 0.85

Why the 0.85 factor?

Insurance companies don't replace 100% of your income—and they shouldn't. Three reasons reduce the actual benefit you need below your full take-home pay:

• Work-related expenses disappear. Commuting, professional clothing, licensing fees, continuing education, and meals-out often total 10–15% of take-home pay. A disabled person doesn't incur them.
• Benefits are often tax-free. If you pay the disability premium with after-tax dollars (the standard for individual policies), benefits arrive tax-free. A $5,000/month tax-free benefit replaces roughly $6,000/month of taxed wages at a 22% bracket.
• Tax brackets drop. With less income, your marginal rate usually falls, so each dollar of benefit replaces more than a dollar of pre-disability take-home.

Insurers typically cap benefits at 60–80% of gross income, which after the tax adjustment roughly equals 85% of take-home. We apply the 0.85 factor to your after-tax income gap as the standard planning target.

Choosing the elimination period

The elimination (waiting) period is the time between becoming disabled and when benefits begin—typically 30, 60, 90, or 180 days. Longer waiting periods mean lower premiums because the insurer's risk window shrinks. The right choice depends on your emergency fund: if you have 3 months of expenses saved, a 90-day elimination period costs you nothing in lifestyle disruption but saves 20–30% on premiums versus 60-day. If your emergency fund covers 6 months, consider 180 days for even bigger savings.

Own-occupation vs any-occupation

This is the most important policy definition and the biggest premium driver. Own-occupation coverage pays if you can't perform the specific duties of your profession—even if you could work at another job. A surgeon who loses hand dexterity can't operate but could teach; own-occ pays, any-occ doesn't. Any-occupation coverage pays only if you can't perform any job suited to your education and experience—much harder to qualify for and far less valuable for skilled professionals. Own-occ is essential for doctors, lawyers, engineers, dentists, and other high-income specialists whose earning power is tied to specific skills. Expect to pay 30–60% more for own-occ, but it's worth every dollar for the right buyer.

Individual vs group coverage

Employer group LTD is a good start but usually insufficient—benefits are often capped at $5,000–$10,000/month, use any-occupation definitions after 24 months, end if you change jobs, and are taxable if the employer pays the premium. An individual non-cancelable, guaranteed-renewable policy with own-occupation coverage is the gold standard: you own it, the insurer can't raise rates or change terms, and it follows you across jobs.