Disability Income Need Calculator
Disability insurance replaces a portion of your income if illness or injury keeps you from working. The right benefit amount is not a single rule of thumb: it depends on your essential monthly expenses, how much existing coverage you already hold through an employer or individual policy, and any other income you would still receive. This calculator subtracts existing coverage and other income from your target monthly need to show the additional benefit gap you would have to insure. Every input is editable, so you can model a 60 percent replacement target or a fixed dollar amount based on your own budget.
Disability income need formula
Target need = max(gross income * replacement %, essential expenses)
Covered income = existing coverage + other income
Monthly gap = max(0, target need - covered income)
Annual gap = monthly gap * 12
The target need is the larger of your chosen replacement percentage and your stated essential expenses, so the result never falls below the costs you must still pay. The gap is floored at zero: if existing income already meets the need, no additional coverage is required.
How to use this estimate
- Replacement targets of 60 to 70 percent of gross income are common because individually purchased benefits are usually tax-free.
- Group employer disability benefits are often taxable when premiums are employer-paid, which lowers their effective value. Enter the after-tax figure if you can.
- Social Security Disability Insurance is not guaranteed and has a strict test; include it as other income only if you are confident you would qualify.
- Elimination periods (the wait before benefits begin) and benefit periods affect cost but not the monthly gap shown here.
- This is an educational estimate, not financial advice. Confirm figures with a licensed advisor.
Disability income need: frequently asked questions
How much of my income should disability insurance replace?
Individual disability policies commonly target 60 to 70 percent of gross income, because benefits from an individually purchased policy paid with after-tax dollars are generally received tax-free, so a lower gross replacement can match prior take-home pay. Group employer policies and the percentage you choose are user-editable inputs here so you can model your own target.
Does Social Security disability count as existing coverage?
It can, but Social Security Disability Insurance (SSDI) has a strict definition of disability and is not guaranteed. If you expect to qualify, enter your estimated monthly SSDI benefit in the other-income field. If you are uncertain, leave it at zero so your private coverage need is not understated.
What expenses should I include in essential monthly need?
Include the costs that continue if you cannot work: housing, utilities, food, insurance premiums, minimum debt payments, childcare, and medical costs. Exclude discretionary spending you could pause. This calculator uses your stated essential expenses as the baseline, not a fixed percentage of income.
Why is the result a gap rather than a total?
The result is the additional monthly benefit you would need to buy, after accounting for income you would still receive while disabled: existing group or individual disability coverage and any other guaranteed income. A zero or negative gap means your current coverage already meets the stated need.
Official sources
- U.S. Social Security Administration: Disability Benefits.
- U.S. Bureau of Labor Statistics: Employee Benefits Survey.
Reviewed by the CalculatorHub team, edited by James Graham, 19 June 2026. See our methodology.