Estimate your disability insurance needs based on your income, monthly expenses, existing coverage, and desired benefit period. See how much coverage gap exists and what your estimated premiums might be.
Disability insurance protects your income — the most valuable financial asset most working adults have. The Social Security Administration estimates that about 1 in 4 of today's 20-year-olds will experience a disability lasting 90 days or longer before reaching retirement age. The most common causes aren't catastrophic accidents but musculoskeletal conditions, cancer, mental health issues, and pregnancy complications. Most people will face a meaningful work interruption at some point in their careers, yet disability insurance is one of the most under-purchased forms of protection.
The economic argument is straightforward: a 30-year-old earning $80,000 with 35 years of expected work has a lifetime earnings stream of about $4 million in today's dollars. That asset is uninsured for most workers — employer-provided coverage, when it exists, typically replaces only 50–60% of pre-disability income, often only for short durations, and almost never covers the high earners adequately because of monthly benefit caps. The gap is real.
This calculator estimates the coverage you need based on income, target coverage percentage, existing employer-provided coverage, monthly expenses, emergency fund, and the elimination period (the waiting period before benefits begin). The output points you toward a target individual disability policy size to fill the gap. Disability insurance is technical — products vary widely in definitions, riders, and exclusions. The calculator establishes the math; choosing the right policy requires reading the contract carefully or working with an independent agent.
Monthly income: $7,500. Target coverage: 60% = $4,500/month. Existing coverage: $0. Gap: $4,500/month. Emergency fund: 3 months ($14,000). Waiting period: 90 days. Emergency fund roughly covers the elimination period. Need ~$4,500/month long-term disability policy with 90-day elimination, benefit period to age 65. Annual premium estimate for a healthy 32-year-old non-smoker office worker: ~$1,300–$1,900/year. Significant protection at a moderate cost. Without coverage, a multi-year disability could permanently derail finances. With coverage, the worst case is manageable.
Monthly income: $35,000. Target coverage: 60% = $21,000/month. Employer coverage: $10,000/month (group LTD plan capped at the policy maximum). Gap: $11,000/month. The gap is enormous despite "having coverage." Group disability policies often cap monthly benefits at $10,000–$15,000, leaving high earners radically underinsured. Solution: an individual "own-occupation" disability policy filling the gap. For a 40-year-old surgeon, premiums for $11,000/month individual coverage can run $4,000–$8,000/year — substantial but small relative to the income being protected. Critical: physicians and dentists should buy "true own-occupation" definition (benefits pay if you can't perform your specialty, even if you can do other work). The standard group definition is usually "any occupation" and pays much less when claims happen.
Monthly income: $6,000. Target coverage: 60% = $3,600/month. Employer LTD: $2,000/month. Gap: $1,600/month. Emergency fund: 1 month ($4,200). Waiting period: 90 days. Two problems: $1,600/month coverage gap, and only 1 month of expenses against a 90-day elimination period. Action plan: (1) build emergency fund to at least 3 months ($12,600), (2) buy $1,600/month supplemental individual disability policy, ~$400–$700/year. Total monthly investment: emergency fund savings plus disability premium. Costs less than $1,000/year and covers a multi-year income loss.
Use this calculator early in your working career — ideally in your 20s or early 30s — when your premiums are lowest and your insurability is best. Health changes (back problems, anxiety, depression, weight gain, family history that triggers an exclusion) can dramatically increase premiums or cause coverage to be denied entirely once they appear on your medical record. Locking in coverage when you're healthy is materially cheaper than waiting.
It's especially important for: high earners whose employer coverage caps far below their income (physicians, attorneys, executives), self-employed and contract workers with no employer benefit, single-income households where one disability would mean total loss of household income, and anyone in a physically demanding occupation where work interruption is more likely.
Pair this with the life-insurance-calculator (disability insurance protects working-years income; life insurance protects death-of-earner income — both have a role), the emergency-fund calculator (the bridge across the elimination period), and the income-tax-estimator (since policy taxation rules depend on who pays premiums).
A key policy decision is definition of disability. "Own-occupation" pays if you can't do your specific job (the most generous and most expensive); "modified own-occupation" pays for a period then transitions to "any occupation"; "any occupation" pays only if you can't do any work at all (the most restrictive and cheapest). For specialized careers (medical, legal, technical), pay extra for true own-occupation. For general office work, modified or any-occupation may be acceptable.
Another important rider: residual or partial disability benefit. This pays a partial benefit if you can work in a reduced capacity. Without this, you get 0% if you can do any work and 100% if you can't do any — a binary cliff that doesn't reflect actual disability experience. Most claims involve partial work capacity, not complete inability to work.
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Most policies cover 50-70% of income
Employer-provided disability benefits
Elimination period before benefits start
Monthly Benefit Needed
$3,600
Annual Benefit
$43,200
Waiting Period Cost
$0
Est. Monthly Premium
$72