Comparison · Insurance · 2026
Critical Illness Cover vs Income Protection UK 2026: Which Do You Need?
Critical illness cover pays a one-off lump sum if you are diagnosed with a serious, defined condition. Income protection pays a regular replacement income for as long as you cannot work due to any qualifying illness or injury. With Statutory Sick Pay worth only £123.25 a week in 2026/27, understanding the gap between the two policies is essential to avoid being underinsured.
TL;DR - 30-Second Summary
- - Critical illness: one-off tax-free lump sum on diagnosis of a listed serious condition
- - Income protection: ongoing tax-free monthly income for any illness/injury preventing work, after a deferred period
- - SSP reality check: just £123.25/week for up to 28 weeks — rarely enough on its own
Side by Side: Critical Illness vs Income Protection
| Feature | Critical Illness Cover | Income Protection |
|---|---|---|
| Payout type | One-off lump sum | Ongoing monthly income |
| Trigger | Diagnosis of a listed condition | Any illness/injury preventing work |
| Mental health cover | Not covered | Often covered |
| Waiting/deferred period | None — pays on diagnosis | 4/13/26/52 weeks, chosen at outset |
| Typical max cover | Sum assured you choose | 50–70% of gross income |
| Best for | Mortgage payoff, one-off costs on diagnosis | Replacing lost income during long-term absence |
What Is Critical Illness Cover?
Critical illness cover pays a single tax-free lump sum if you are diagnosed with one of a defined list of serious conditions during the policy term — commonly cancer, heart attack, stroke and organ failure, among 30-50 conditions depending on the insurer. The definitions used are strict and standardised by the Association of British Insurers, so a diagnosis must meet the specific severity criteria in the policy wording, not just a general diagnosis.
It is often taken out alongside a mortgage (sometimes combined with life insurance as a joint policy) so that a lump sum is available to clear the mortgage or fund significant one-off costs like home adaptations or private treatment.
What Is Income Protection Insurance?
Income protection pays a regular, usually tax-free, monthly income if you are unable to work due to illness or injury of almost any kind, not just a defined critical condition, once the chosen deferred period has passed. Cover continues until you return to work, reach the policy end date, or reach retirement age, depending on the policy term you choose.
Because Statutory Sick Pay is only £123.25/week for up to 28 weeks in 2026/27 — and self-employed workers get no SSP at all — income protection is often considered the more fundamental form of protection insurance for replacing lost earnings over an extended absence.
Statutory Sick Pay: Why the Gap Matters
SSP in 2026/27 is £123.25 a week, payable for up to 28 weeks to employees earning at least the Lower Earnings Limit of £129/week. For someone earning the average UK salary, SSP typically replaces well under half of normal take-home pay, and it stops entirely after 28 weeks with no further statutory support beyond means-tested benefits.
Many employers offer enhanced company sick pay beyond SSP, but this varies enormously by employer and length of service. Income protection insurance is designed specifically to close this income gap once employer sick pay and SSP run out.
Who Should Choose What?
- - You want a guaranteed lump sum to clear a mortgage on serious diagnosis
- - You have savings or sick pay to cover shorter absences
- - You want funds for one-off costs like private treatment or home adaptation
- - You are self-employed with no employer sick pay
- - You want ongoing income replacement, not a one-off sum
- - You want cover for mental health or musculoskeletal conditions too
Many financial advisers recommend income protection as the foundation of a protection plan, adding critical illness cover as a supplementary lump sum where budget allows.