Do you need disability insurance? The number most often cited in US personal finance writing is a 25% lifetime probability of becoming disabled before age 67 for a 20-year-old. The figure comes from a Social Security Administration actuarial note, and it is a real published estimate. But it measures something different from what a salaried worker needs to know, which is how much of their income an employer plan would replace, for how long, and what it would cost them to fill the gap.
This article separates three quantities that are often blended together: how likely a disability is over a working life, what share of pay a plan replaces, and how long benefits last. It then sets out what employer benefits, individual disability income cover and critical illness cover each pay, and where each one stops. The available sources are almost entirely US commercial or advisory pages, so the analysis does not carry over to UK or Indian rules.
Where the 25% figure comes from and what it covers
The estimate is in Social Security Administration actuarial note 2022.6 (AN2022-6). It gives a 25% probability that an insured US worker aged 20 in 2022 becomes disabled before normal retirement age of 67, under the 2022 Trustees intermediate assumptions. The SSA note is the primary document, and any citation should point to it rather than to secondary pages that repeat the number. LIMRA's 2024 Disability Insurance Awareness Month page repeats the roughly one-in-four figure, and the research does not show whether that page reproduces the 2022 note's exact wording or cites an older SSA publication.
Older and later numbers exist, and they should not be mixed with the 2022 value. An eMoney Advisor education page gives '3 in 10' for a 20-year-old, citing a 2012 SSA publication, so it reflects an earlier set of assumptions. A Wikipedia entry cites a later SSA note for 'just under one in four'. The research did not confirm that later note, so the 2022 cohort figure is the only SSA value this article relies on. The 25% figure should be read as a 2022 cohort estimate that has since been superseded by later SSA work, not as the current SSA estimate.
Three numbers that answer different questions
A salaried reader gets a gap only when three separate quantities line up badly, and the headline figure speaks to just one of them.
Incidence is the lifetime chance of becoming disabled. The SSA figure addresses this, for a population of insured workers. It is the reason disability is not a rare event across a career. It says nothing about the size of the loss for any one person, and it is not a personal forecast.
Replacement is the share of pay a benefit covers. Here the sources give ranges, not norms. Guardian says workplace short-term plans usually reimburse about 40% to 60% of pre-disability salary. Unum describes group cover as up to 60% of monthly income, and separately recommends about 60% of after-tax income as a planning level. Justworks gives long-term cover of about 50% to 60% of base wages. HRGet recommends 70% to 80% of gross income, and Facet gives 45% to 65%. The HRGet and Facet figures are adviser and vendor framing, and a vendor that sells cover has a reason to recommend a higher replacement level.
Duration is how long benefits continue. Short-term and long-term plans differ sharply here. Justworks lists short-term payouts of nine to 52 weeks after a seven-to-14-day wait. A worker with a six-month short-term benefit and a long-term plan that starts later has a different gap from one with a single long-term policy that begins on day 90. The replacement percentage means little without the period over which it is paid.
Put together, a salaried worker with a 60% long-term benefit, a short-term benefit ending at 26 weeks and no individual policy has a gap that the 25% figure cannot size. The lifetime incidence says the risk is real. The replacement and duration terms say where the money stops.
Why the coverage-gap statistics conflict
Several secondary sites give figures on how many workers lack cover. Student Loan Planner says at least 51 million US working adults lack coverage beyond basic Social Security disability, and that about 65% of the private sector has no long-term disability insurance. Simpledecider says about 48% of US workers have any long-term disability insurance. These cannot all be read the same way. The 65% figure is about the private sector and long-term cover, while the 48% figure covers any long-term cover across all workers, and the two are not reconciled in the research. Neither is tied to a primary survey in the supplied material, so the figures should be treated as attributed and unverified. The Council for Disability Awareness is cited by Student Loan Planner as a source for related statistics, which the research does not confirm directly.
Commercial incentives matter here. Pages that sell cover, or that send readers to advisers, have reason to stress the gap and the recommended replacement level. Pages that sell alternatives have reason to question disability cover. Neither pattern makes a figure false, but it is a reason to trust the primary SSA note more than the framing built on top of it.
State programmes and workers' compensation
Two assumptions are common. The first is that the government will cover the gap. US federal Social Security disability insurance (SSDI) pays only under a strict definition of disability, which an eMoney Advisor page and an advisory firm both describe. The research does not cover state programmes, so nothing here applies to them. The second is that workers' compensation protects against disability. OnPay says workers' compensation covers work-related incidents, so it does nothing for a non-work illness or injury.
Employer cover, individual cover and changing jobs
Employer plans in the sources usually replace part of pay, not all of it. The ranges are in the replacement section above, and they vary by plan and by provider. The tax treatment is the detail most readers miss. Guardian notes that an employer-paid benefit may be taxable when received. OnPay says individual US benefits are generally tax-exempt when premiums come from after-tax income. That OnPay point is not confirmed against IRS guidance in the research, so it should be checked before anyone relies on it.
Job changes are where cover quietly lapses. Unum's group disability page describes group cover as only sometimes portable. Guardian's individual disability page says individual policies generally stay with the holder when they change jobs. Those two statements together suggest a practical check: an individual policy bought alongside an employer plan is the one most likely to survive a move, but the policy wording and the insurer confirm that.
Critical illness cover: a different risk
Critical illness cover pays a one-time lump sum after diagnosis of a listed condition, such as heart attack, stroke or cancer. The payout does not depend on being unable to work, so it covers a different risk from income replacement and cannot substitute for it. Principal says it places no restrictions on how the money is used and that its policy covers more than 40 illnesses, a claim the research has not checked against current product literature.
Exclusions decide most disputed claims. Early-stage cancer may not qualify, and Insure.com and other advisory pages describe policies that pay only once the disease has progressed. Pre-existing conditions, meaning diagnoses made before purchase, are generally excluded according to the policy descriptions the research found, and the exclusion rules are in the policy wording. Some insurers set upper age limits on new policies, which the research supports only as a general pattern across sources.
Waiting and survival periods also differ. HDFC ERGO describes a waiting period of about 90 days as common, with a survival period of 14 to 30 days. CIBC requires 30 days' survival and a 90-day waiting period for cancer. These are two insurers' terms, not a market standard. A claimant who dies during the survival period typically receives nothing, so the period matters most for people with serious diagnoses.
Is critical illness cover worth the premium?
The case for critical illness cover is that the lump sum is free to spend and does not wait on a work assessment. The case against is that it pays only for listed conditions and that the qualifying rules decide most payments. NerdWallet argues that for most people the money may be better spent elsewhere, and suggests a critical illness rider on life insurance as a cheaper route. Consumer Reports questions whether the cover is worth it. Consumer Reports also cites Aflac data that 44% of employers offer critical illness cover, up from 24% five years earlier. That is vendor data, reported second-hand, and should be treated as an estimate.
Evidence assessment
Strong:
- The SSA 2022 actuarial note gives a 25% lifetime probability for an insured US worker aged 20 in 2022 of becoming disabled before 67, under 2022 Trustees intermediate assumptions. The primary note has not been re-checked for this revision, so it sits at the edge of strong.
- Critical illness cover pays a one-time lump sum after diagnosis of a listed condition, regardless of work status.
Moderate:
- Employer replacement ranges from Guardian, Unum and Justworks, which show the spread across providers rather than a standard.
- Pre-existing conditions are generally excluded under critical illness policies, according to the policy descriptions the research found. The primary policy wording was not reviewed.
- Waiting and survival period examples from HDFC ERGO and CIBC differ by insurer and are not a standard.
Weak:
- The coverage-gap statistics (51 million, 65% and 48%), which conflict and are not tied to a primary survey.
- The HRGet (70% to 80% of gross income) and Facet (45% to 65% of income) replacement views, which are adviser and vendor framing.
- The Aflac-sourced employer uptake figure (44%, up from 24%), reported second-hand by Consumer Reports.
Unknown:
- UK, Indian and state-level rules, including product regulation.
- How often disability or critical illness claims are refused, and how many critical illness payouts occur per policy.
- Verified premium benchmarks by age and income.
- Whether later SSA values cited by secondary sites are accurate.
Practical implications
- Start from your own country's rules. The US figure does not transfer to UK or Indian circumstances on this evidence.
- Read the employer plan document for the replacement percentage, the benefit period, the waiting period and who pays the premium. Those four terms set the size of any gap.
- Check, before a job change, whether group cover continues and whether an individual policy would survive the move.
- Compare waiting and survival periods, exclusions and pre-existing-condition rules line by line across quotes, since headline descriptions hide the terms that decide claims.
- Get quotes for your own age and income. The research contains no premium benchmark that applies to a given person.
- Confirm any tax treatment with a qualified adviser, and do not use the 25% figure as a forecast for yourself.
Limitations and open questions
The sources are mostly commercial pages, and the strongest figure rests on a primary document whose text has not been re-checked here. Whether the later SSA value is correct, what the coverage-gap statistics really measure, and how often claims are refused would each need primary data. Official coverage surveys and insurer claim-outcome data would settle most of the disputed points, and neither appears in the supplied material.
Editor's take
The 25% figure is a credible US population estimate, and it is a weak basis for a personal decision. Its value is in showing that long-term disability is common across a working life, which makes the question of replacement and duration worth asking. It does not show how much a particular salaried worker would lose, or whether their employer plan covers that loss. For most salaried workers, the first step is to read the employer plan and measure the replacement and duration it gives against their own costs.
Critical illness cover is harder to justify on this evidence. It pays a fixed sum on a narrow list of triggers, and the qualifying rules that decide claims are where the sources disagree most. Treating it as an optional top-up, priced on its own terms, makes more sense than treating it as a default purchase.