The one-sentence version
- Life insurance pays your family after you die.
- Disability insurance replaces a portion of your paycheck if you cannot work.
- Critical illness insurance pays you a lump sum the moment you are diagnosed with a covered condition - while you are still alive and dealing with the diagnosis.
Where the gaps show up
Long-term disability typically waits 90–180 days before the first check and replaces only 40–60% of income, often capped and taxable if the employer paid the premium. Life insurance does nothing during treatment. That leaves a very expensive first six months uncovered.
How the three stack together
In a fully-protected household, critical illness handles the immediate cash shock of diagnosis (deductibles, travel, lost overtime), disability replaces ongoing income if recovery is long, and life insurance protects the family in the worst-case outcome. Removing any leg of that stool exposes the household somewhere.