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Benefit Calculation

Residual (partial) disability benefits: How the Monthly Number Is Actually Calculated

Residual (partial) disability benefits: basis = pre-disability vs current earnings, ratio 50% of loss, taxed follows primary claim.

Updated Oct 22, 2026 157 words Reviewed against primary sources
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Key facts
Wage basisPre-disability vs current earnings
Replacement ratio50% of loss
Tax treatmentFollows primary claim

Residual benefits pay the percentage of income you lost, not a flat check. A surgeon back at 50% capacity earning 60% of prior income collects roughly half the full benefit.

The calculation

Parameter Detail
Benefit component Residual (partial) disability benefits
Wage basis Pre-disability vs current earnings
Ratio 50% of loss
Tax treatment Follows primary claim

Two policies can both say ‘60%’ and pay thousands apart — the difference lives in the wage basis and the tax line, not the headline ratio.

Worked example

Take a $120,000 package that is $90,000 base plus $30,000 bonus. A ‘salary’ policy pays 60% of $90,000 = $4,500/month. An ‘income’ policy paying 60% of documented average earnings pays $6,000. Same person, same premium tier — $18,000 a year apart.

What to check in your contract

  • The word after ‘disability income’ — salary, earnings or income.
  • Whether employer-paid premiums make benefits taxable.
  • Whether the ratio applies before or after SSDI offset.

Residual (partial) disability benefits: the headline ratio is marketing — the wage basis and tax line are the contract.

Frequently asked questions

Why does everyone say 60%?
60% of a tax-free benefit roughly equals after-tax take-home u2014 the ratio assumes individually-owned coverage.
Are disability benefits taxed?
Employer-paid: yes. Individually-paid premiums: no. Group voluntary plans: usually yes.
Does the benefit grow over time?
Only with a COLA rider u2014 without one, inflation halves a 20-year claim's real value.