Calculate disability insurance coverage needed based on income and time until retirement

Why disability insurance gets overlooked

Disability insurance replaces a portion of income if you become unable to work due to injury or illness. It is one of the most commonly-overlooked personal insurances despite covering the most probable catastrophic event for working-age adults — the odds of becoming disabled during a working career are significantly higher than the odds of dying during the same period. Yet most households carry life insurance and no individual disability coverage beyond whatever their employer provides.

How the math works

Target monthly coverage = monthly income × replacement percentage (typically 60-70%). Gap = target coverage − existing coverage from employer short-term and long-term disability policies and any statutory coverage. The gap is the amount typically covered by a private policy. For present-value of the coverage over the working career: total protected income = monthly gap × 12 × years until retirement. This is a rough cap on the meaningful coverage amount — insurance that exceeds expected earnings is typically not purchaseable anyway.

Short-term vs long-term disability

Short-term disability typically covers 3-6 months after a brief elimination period, often funded by employers as a benefit. It handles common issues like surgery recovery, difficult pregnancies, and short-term injuries. Most employed workers have reasonable STD coverage.

Long-term disability is where the real exposure sits. LTD policies typically kick in after STD runs out (3-6 months) and cover up to retirement age for qualifying disabilities. This is where most households find the coverage gap — employer LTD is often capped at 40-60% of base salary, doesn't cover bonuses or commissions, and may not be portable if you leave the job.

What counts as "disabled" matters enormously

Two definitions dominate: "own-occupation" (can't do your specific job) and "any-occupation" (can't do any job you're reasonably qualified for). Own-occupation is broader — a surgeon with hand tremors can't surgery but could do something else; an own-occupation policy still pays. Any-occupation policies stop paying if you can do any work at all. Individual policies often offer own-occupation in the first 2 years then switch to any-occupation; true long-term own-occupation coverage is the gold standard but expensive.

Replacement rate considerations

Private disability policies typically cap at 60-70% of gross income because benefits are often tax-free (premiums paid with after-tax dollars), making the effective replacement close to pre-disability net take-home. Aiming for 80-100% net replacement is usually the right target. Going higher is typically not purchaseable because insurers don't want to remove the incentive to return to work.

What the calculator does not model

Specific policy features the tool does not adjust for: elimination period (longer waits reduce premium but delay benefit), benefit period (to retirement vs 5-10 years), cost-of-living riders, future-insurability options, residual benefits for partial disability. These significantly affect premium cost but not the core coverage gap calculation. For actual policy shopping, work with a disability insurance specialist who can walk through rider choices with specific carrier quotes.