Short-term vs long-term disability: where the real risk lives
Short-term disability gets attention because it triggers more often — childbirth recovery, knee surgery, a hospitalization. It is also relatively easy to self-insure if you have 3–6 months of emergency savings. The financial damage from a 3-month leave is unpleasant but rarely structural.
Long-term disability is the opposite. The probability of needing it in any given year is low, but the consequences are catastrophic. According to the Social Security Administration, a 20-year-old worker has roughly a 25% chance of experiencing a disability lasting 90 days or longer before retirement. Among disabilities that cross the 90-day mark, the median duration is over two years. A two-year income gap at typical professional salaries is a six-figure event that can wipe out a decade of savings and force the sale of a home.
This calculator focuses on long-term coverage because the math demands it. Self-insuring a 6-month gap is feasible with a healthy emergency fund. Self-insuring a 3-year gap is feasible for almost no one outside the very wealthy. The job of disability insurance is to take that low-probability, high-severity risk off your personal balance sheet and put it on an insurer's.
Own-occupation vs any-occupation: read the contract
The single most important variable in a disability policy is not the benefit amount or the elimination period — it is the definition of disability itself. Two policies with identical monthly benefits and elimination periods can behave completely differently when you file a claim, based entirely on how "disabled" is defined.
True own-occupation is the strongest definition. It pays benefits when you can no longer perform the material and substantial duties of your specific occupation, even if you take work in a different field. A pediatric dentist who develops a hand tremor can collect full benefits and teach at a dental school — earning a salary there — without any offset. This definition is the default in policies sold to physicians, dentists, attorneys, and other specialized professionals.
Modified own-occupation pays benefits if you cannot perform your own occupation and are not working in another. If you do take other work, your benefit is reduced or eliminated. Any-occupation, the strictest, requires that you cannot perform any occupation for which you are reasonably suited by training, education, or experience. Most group LTD policies start as own-occupation for the first 24 months of a claim, then automatically convert to any-occupation — at which point many claims that were paying suddenly stop.
When you compare quotes, ask the agent for the exact contract language defining disability, recovery, and partial/residual benefits. A 10% premium difference between two policies is meaningless if one of them is far less likely to pay during a real claim.
Elimination period: where your emergency fund and policy meet
The elimination period is essentially a deductible measured in days. The shorter it is, the sooner benefits start — and the higher your premium. A typical premium curve shows that moving from a 30-day to a 90-day elimination period drops your premium by 20–30%; moving from 90 to 180 days drops it another 10–15%.
The smart move is to align the elimination period with the size of your emergency fund. If you have 3 months of essential expenses saved, a 90-day elimination period is the natural pairing. If you have 6 months, you can stretch to 180 days and use the premium savings to buy more benefit, a longer benefit period, or a richer definition of disability.
A common mistake is buying a 30-day elimination period because it "starts paying sooner" — without realizing the premium increase often outweighs the bridge value, especially if you already have any savings cushion. The calculator above shows how many months your current savings can cover, so you can right-size the elimination period rather than defaulting to whatever the agent quotes first.
Taxation of benefits: the asymmetry nobody mentions
How your premiums are paid determines how your benefits are taxed — and the difference is large enough to change how much coverage you need to buy. The federal rule is simple: if you pay the premium with after-tax dollars on an individually owned policy, benefits are received tax-free. If your employer pays the premium (or you pay it pre-tax through a Section 125 cafeteria plan), benefits are taxable as ordinary income.
Take a $100,000-earner with employer LTD that pays 60%. Gross benefit: $5,000/month. After federal, state, and FICA-equivalent taxes during a disability, the actual cash that lands in the bank account is often $3,500–4,000 — closer to 40–48% of pre-disability gross income, not 60%. The same person who buys a $3,000/month individual policy with after-tax premiums receives the full $3,000 tax-free, and now has $6,500–7,000 of actual spending power.
This asymmetry is why insurance planners often recommend "topping up" an employer LTD with an individual policy even when the percentages look adequate on paper. The after-tax math, not the gross percentage, is what determines whether you can pay the mortgage.
A separate trap: some employers let you choose whether to pay LTD premium yourself with after-tax dollars (so benefits are tax-free) or have the employer pay it (so benefits are taxable). Almost always, paying it yourself is correct unless your top marginal rate is genuinely tiny — the small premium dollar cost converts a taxable benefit into a tax-free one at exactly the moment you need the cash flow.
Social Security Disability: a backstop, not a plan
It is tempting to look at SSDI and assume it covers the gap. In practice, it covers very little for most middle- and high-income earners, for three reasons.
First, the eligibility bar is strict. The SSA uses a definition of disability that requires you to be unable to engage in any substantial gainful activity for at least 12 months (or a condition expected to result in death). Approximately 65% of initial SSDI applications are denied. Most successful claims are won at the reconsideration or hearing stage, after a 12- to 24-month process during which no benefits are paid.
Second, the average benefit is small relative to professional income. The average SSDI payment in 2025 was around $1,540/month. The maximum for a high earner is roughly $4,000/month — but reaching the max requires decades of high earnings credited to your record. For someone earning $150,000 with a family, SSDI alone replaces a fraction of needs.
Third, group LTD policies almost always offset SSDI dollar-for-dollar. If your group LTD pays $5,000 and you eventually collect $1,800 of SSDI, your group LTD drops to $3,200. The total income stays the same. This is another reason individual LTD coverage — which generally does not offset SSDI — is so valuable: you keep both checks.
Treat SSDI as a possible backstop that may eventually arrive after a contested process. Build your real disability plan around employer LTD plus an individual policy, with an emergency fund bridging the elimination period. If SSDI eventually pays out on top, that is upside. Do not plan as if it will.
Social Security Disability: a backstop, not a plan
It is tempting to look at SSDI and assume it covers the gap. In practice, it covers very little for most middle- and high-income earners, for three reasons.
First, the eligibility bar is strict. The SSA uses a definition of disability that requires you to be unable to engage in any substantial gainful activity for at least 12 months (or a condition expected to result in death). Approximately 65% of initial SSDI applications are denied. Most successful claims are won at the reconsideration or hearing stage, after a 12- to 24-month process during which no benefits are paid.
Second, the average benefit is small relative to professional income. The average SSDI payment in 2025 was around $1,540/month. The maximum for a high earner is roughly $4,000/month — but reaching the max requires decades of high earnings credited to your record. For someone earning $150,000 with a family, SSDI alone replaces a fraction of needs.
Third, group LTD policies almost always offset SSDI dollar-for-dollar. If your group LTD pays $5,000 and you eventually collect $1,800 of SSDI, your group LTD drops to $3,200. The total income stays the same. This is another reason individual LTD coverage — which generally does not offset SSDI — is so valuable: you keep both checks.
Treat SSDI as a possible backstop that may eventually arrive after a contested process. Build your real disability plan around employer LTD plus an individual policy, with an emergency fund bridging the elimination period. If SSDI eventually pays out on top, that is upside. Do not plan as if it will.