Income Protection vs Critical Illness Cover: Which Do You Need?
Last updated: June 2026 · 9 min read
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Quick Answer
Income protection pays a regular monthly income if any illness or injury stops you working, and keeps paying until you recover, retire, or the term ends. Critical illness cover pays a single tax-free lump sum if you are diagnosed with one of a defined list of serious conditions (cancer, heart attack, stroke), whether or not you can still work. If your priority is covering monthly bills when you cannot work, income protection usually comes first because it covers far more causes; critical illness suits a one-off need like clearing a mortgage.
1. How Income Protection Works
Income protection replaces a portion of your earnings — typically 50–65% of gross income — as a regular monthly payment when you are unable to work due to illness or injury. Crucially, it covers any cause that stops you working, from a back injury to long-term illness or mental-health conditions, subject to the policy definition of incapacity.
- ✓ Pays: a monthly income, usually until you recover, the term ends, or you retire.
- ✓ Deferred period: a waiting time before payments start (4–52 weeks). Longer waits = lower premium.
- ✓ Best for: anyone whose household relies on their earnings — especially the self-employed with no sick pay.
2. How Critical Illness Cover Works
Critical illness cover pays a single, tax-free lump sum if you are diagnosed with one of a defined list of serious conditions and it meets the policy's severity definition. The payout is yours to use however you like — clearing a mortgage, funding treatment or adaptations, or replacing income while you recover. It pays whether or not you can still work.
- ✓ Pays: a one-off lump sum on diagnosis of a listed condition.
- ✓ Conditions: a defined list — commonly cancer, heart attack, stroke, MS, and others. Coverage breadth varies between insurers.
- ✓ Best for: clearing a big debt or covering a large one-off cost on diagnosis of a serious illness.
3. Side-by-Side Comparison
| Income Protection | Critical Illness | |
|---|---|---|
| Payout shape | Regular monthly income | One-off lump sum |
| Triggered by | Any illness/injury stopping work | Diagnosis of a listed condition |
| Pays if you can still work? | No — only if you cannot work | Yes — diagnosis is enough |
| Best use | Replacing ongoing income / bills | Clearing a mortgage or big cost |
| Range of causes | Very broad | Limited to the defined list |
4. Which Do You Need?
- ✓ Self-employed / no sick pay: income protection first — it covers the widest range of causes and keeps paying.
- ✓ Large mortgage, want a safety net on serious diagnosis: critical illness, often alongside life cover.
- ✓ Want both ongoing income and a lump-sum buffer: hold both if affordable; otherwise prioritise income protection for breadth.
- ✓ Family with dependants: consider pairing either with term life insurance so the household is covered on death too.
5. Buying Tips
- 1. Disclose fully. Non-disclosure of medical history is the top reason protection claims are refused. Answer every question honestly.
- 2. Set the deferred period to match your savings. The longer you can self-fund, the lower your income-protection premium.
- 3. Check the definition of incapacity. "Own occupation" cover (pays if you cannot do your own job) is stronger than "any occupation".
- 4. Compare the condition list on critical illness — more conditions and clearer definitions mean a stronger policy.
6. Frequently Asked Questions
What is the difference between income protection and critical illness cover?
Income protection pays a regular monthly income if any illness or injury stops you working. Critical illness pays a one-off lump sum on diagnosis of a defined serious condition, whether or not you can work. One replaces income over time; the other is a lump sum on diagnosis.
Do I need income protection or critical illness cover?
For covering monthly bills when you cannot work, income protection usually comes first because it covers any illness or injury. Critical illness suits a one-off need like clearing a mortgage. Many hold both.
What is a deferred period in income protection?
The waiting time between being unable to work and the policy starting to pay (commonly 4–52 weeks). A longer deferred period lowers the premium but means you self-fund for longer.
Does critical illness cover pay out for any illness?
No — only for the specific listed conditions that meet the policy’s severity definition. Income protection, by contrast, pays for any illness or injury that stops you working.
Is the payout taxed?
Personal income protection and critical illness payouts are generally tax-free in the UK when you pay the premiums yourself. Employer-funded arrangements can differ — check your situation.
Compare Protection Cover
See income protection, critical illness and life cover side by side from regulated insurers.
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