Comparison · Insurance · 2026
Income Protection vs Critical Illness Insurance UK 2026
Both policies protect you financially when illness or injury stops you working — but they work very differently. Income protection replaces a percentage of your salary every month until you recover or retire. Critical illness pays a one-off lump sum when you are diagnosed with a specified serious condition. This guide compares both policies across 12 factors, explains the state benefits gap that makes both valuable, and helps you decide whether you need one, the other or both.
The State Benefits Gap
Without private cover, the state safety net for illness is modest: SSP is only £123.25/week (28 weeks max), then ESA via Universal Credit is approximately £130.60/week. For someone earning £50,000/year (£962/week), the drop to £123.25/week represents an immediate 87% income cut. Private income protection or critical illness insurance fills this gap.
12-Factor Head-to-Head Comparison
| Feature | Income Protection (IP) | Critical Illness (CI) |
|---|---|---|
| What it pays | Monthly income (50–70% of salary) | One-off lump sum on diagnosis |
| When it pays | While unable to work (illness/injury) | On diagnosis of specified condition |
| Conditions covered | Any illness/injury preventing work | Listed conditions only (typically 40–100+) |
| Payment duration | Until recovery, retirement or policy end | Once only — policy ends after claim |
| Deferral period | 1, 3, 6, 12 or 24 months (your choice) | Usually 14–28 day survival period |
| Typical premium (£50k salary) | ~£80–120/month (non-smoker, 35, 3-month deferral) | ~£50–80/month (£100k CI cover, non-smoker, 35) |
| Definition of disability | "Own occupation" (best) or "any occupation" | N/A — triggered by diagnosis alone |
| Mental health coverage | Yes (most modern policies) | Limited — some CI policies include |
| Tax on premiums | Not deductible (personal purchase) | Not deductible (personal purchase) |
| Tax on pay-out | Tax-free (personal policy) | Tax-free lump sum |
| Employer sick pay interaction | Deferred period should match employer sick pay length | Independent of employer sick pay |
| Self-employed suitability | Essential — no employer sick pay fallback | Useful for immediate large costs |
How Income Protection Works
Income protection pays a monthly benefit — typically 50–70% of your gross salary — after a waiting (deferral) period if you are unable to work due to illness or injury. The policy continues to pay until you return to work, the policy end date, or (if written to retirement) until you reach retirement age.
The definition of disability matters enormously:
- "Own occupation" — you cannot do your specific job. This is the best definition for professionals (surgeons, solicitors) — you do not have to be unable to do any job.
- "Any occupation" — you cannot do any work at all. Much harder to claim on and should be avoided.
- "Suited occupation" — you cannot do work suited to your education, training and experience. A middle ground.
Worked example: IP for a £50,000 salary earner
- IP policy: 60% of salary = £30,000/year benefit (£2,500/month)
- 3-month deferral: no benefit for first 3 months (use savings or employer sick pay)
- Own occupation definition, to age 65
- Estimated premium: ~£100/month (non-smoker, age 35, no serious pre-conditions)
- After 12 months off work: IP pays £2,500 × 9 months = £22,500 vs state benefits (SSP ended, ESA ~£570/month) = £5,130 — a £17,370 difference
How Critical Illness Insurance Works
Critical illness insurance pays a specified lump sum if you are diagnosed with a condition listed in the policy — typically including cancer, heart attack, stroke and 30–100 other serious conditions depending on the insurer. The policy ends once a claim is paid.
The lump sum can be used for anything: paying off the mortgage, adapting the home for disability, funding private medical treatment, or simply replacing the income lost during treatment and recovery. Because it is paid upfront, it provides immediate financial breathing room that monthly IP cannot replicate.
Worked example: CI for a £500k cover, age 35 non-smoker
- Critical illness cover: £500,000 lump sum on qualifying diagnosis
- Estimated premium: ~£150/month (age 35, non-smoker, standard health)
- On cancer diagnosis: immediate £500,000 tax-free lump sum
- Use case: pay off £280,000 mortgage, fund private treatment, adapt home, replace 2 years' income
Should You Have Both?
IP and CI serve different needs and complement each other well:
- Critical illness covers immediate, large financial needs: paying off debt, funding private treatment, home adaptation, loss of earnings during a treatment period not covered by IP deferral.
- Income protection covers the long-term risk of extended absence — particularly valuable for conditions that cause long-term work incapacity but may not qualify for CI (e.g. chronic fatigue, musculoskeletal conditions, mental health).
- If budget is limited: IP is generally considered the higher priority because it protects ongoing income for any condition preventing work — not just a defined list.
- • Self-employed (no employer sick pay)
- • Single income households with mortgage
- • Those with limited savings buffer
- • High-earners with large fixed outgoings
- • Anyone with a large mortgage to clear
- • Parents wanting lump sum for family protection
- • Those who want immediate cash for private treatment
- • Complementing IP to cover the deferral period
Tax Treatment
For personally-held policies (not employer-paid):
- IP premiums: not tax-deductible. Premiums paid from after-tax income.
- IP pay-out: tax-free (because premiums were not tax-deductible).
- CI premiums: not tax-deductible.
- CI lump sum: completely tax-free — no income tax, no CGT.
For employer-paid IP (Relevant Life / Group IP): employer can deduct premiums as a business expense and benefits-in-kind rules may apply — speak to a specialist for employer-sponsored arrangements.