Transparent method
The formula
Worked example
Example inputs
How to interpret the result
An employer's group disability benefit often doesn't fully replace pre-disability income, and the specific gap depends on the plan's benefit cap, whether the benefit itself is taxable, and how long a waiting period runs before payments begin, three details that vary by plan and materially change what the real income gap actually is.
Before you rely on it
What to check
Confirm your specific plan's benefit cap, taxability and waiting period directly from plan documents, rather than assuming a standard replacement percentage applies without those specifics.
The common error
Where people go wrong with disability insurance needs calculator
Assuming employer disability coverage fully replaces pre-disability income without checking the plan's actual benefit cap, taxability and waiting period. Those specific details can leave a meaningful income gap that a generic replacement-percentage assumption misses.
Sensitivity evidence
How current monthly gross income changes the additional monthly coverage need
| Current monthly gross income | Additional monthly coverage need | Target monthly replacement income | Annual additional coverage need |
|---|---|---|---|
| $6,400 | $840 | $3,840 | $10,080 |
| $7,200 | $1,320 | $4,320 | $15,840 |
| $8,000worked example | $1,800 | $4,800 | $21,600 |
| $8,800 | $2,280 | $5,280 | $27,360 |
| $9,600 | $2,760 | $5,760 | $33,120 |
Every input, tested
Which input moves the additional monthly coverage need most
| Input | Tested from | To | Additional monthly coverage need at each end | Swing |
|---|---|---|---|---|
| Current monthly gross income | $7,200 | $8,800 | $1,320 to $2,280 | $960 (53%) |
| Employer monthly disability benefit | $2,250 | $2,750 | $2,050 to $1,550 | $500 (28%) |
| Target replacement percentage | 58.0% | 62.0% | $1,640 to $1,960 | $320 (18%) |
| Other dependable monthly income | $450 | $550 | $1,850 to $1,750 | $100 (5.6%) |
Two variables at once
Additional monthly coverage need by current monthly gross income and target replacement percentage
| Current monthly gross income \ Target replacement percentage | 56.0% | 60.0% | 64.0% |
|---|---|---|---|
| $6,400 | $584 | $840 | $1,096 |
| $7,200 | $1,032 | $1,320 | $1,608 |
| $8,000 | $1,480 | $1,800 | $2,120 |
| $8,800 | $1,928 | $2,280 | $2,632 |
| $9,600 | $2,376 | $2,760 | $3,144 |
Step by step
The worked example, input by input
| Input | Value used |
|---|---|
| Current monthly gross income | $8,000 |
| Target replacement percentage | 60.0% |
| Employer monthly disability benefit | $2,500 |
| Other dependable monthly income | $500 |
| Additional monthly coverage need | $1,800 |
| Target monthly replacement income | $4,800 |
| Annual additional coverage need | $21,600 |
Where the inputs come from
Current monthly gross income is your pay before tax. Target replacement percentage is the share of income you want to replace, commonly 60% to 70%, since long-term disability policies rarely pay more. Employer monthly disability benefit is what your workplace long-term disability plan pays, from your benefits guide, and other dependable monthly income covers items such as a spouse's earnings or investment income you can rely on. Check whether the benefit is taxable, which depends on who pays the premium.
Using the additional monthly coverage need in a real decision
Look for own-occupation definitions and non-cancelable, guaranteed-renewable terms.
When the result stops applying
Policies differ in the waiting period, benefit length and definition of disability, and these affect price as much as the benefit amount. Employer coverage may be taxable and often ends when you leave. Benefits are often offset by Social Security disability and other income. Insurers limit coverage to a share of income, so you cannot insure 100%.
What to compare it with
Compare with the life insurance needs calculator, and see the emergency fund and severance runway pages for the cash cushion during the waiting period. The take-home pay calculator shows the tax effect on benefits. Get quotes from an independent agent who sells several carriers.
People also ask
Frequently asked questions
How much disability insurance do I need?
Typically enough to replace 60% to 70% of your income after accounting for employer coverage and other reliable income.
What is an own-occupation policy?
A policy that pays if you cannot perform your own job, even if you could work in another field, which is more valuable for specialized professionals.
Are disability benefits taxable?
If your employer pays the premium, the benefits are generally taxable, and if you pay with after-tax dollars, the benefits are generally tax free.