What is the core difference?
Critical illness cover pays a tax-free lump sum if you are diagnosed with a specified serious illness — cancer, heart attack, stroke, and 40–80 other conditions depending on the policy. The payment is made once, on diagnosis. You can use the money however you like: to pay off your mortgage, fund treatment, adapt your home, or replace lost earnings.
Income protection insurance, by contrast, pays a regular tax-free monthly income — typically replacing 50–70% of your gross salary — for as long as you are unable to work due to illness or injury. It covers any illness or injury, not just a specific list. If you are off work for 30 years, it pays for 30 years. This is the fundamental distinction: lump sum vs ongoing income.
Critical illness cover: the key facts
Critical illness policies are defined by their condition list. The Association of British Insurers (ABI) publishes minimum standards, but better policies cover more conditions and pay more generously on partial diagnoses. When comparing policies you should look at: the number of conditions covered, whether early-stage cancer is included, and the insurer's claims record.
What critical illness cover pays for
The lump sum payout can be used for anything:
- Clearing your mortgage — so your home is safe even if you cannot work
- Funding private medical treatment or specialist care
- Adapting your home if you have mobility needs after an illness
- Replacing lost income while you recover
- Paying off debts or building an emergency fund
What critical illness does not cover
Important limitations to understand:
- Pre-existing conditions are usually excluded
- Minor or early-stage cancers may be excluded or attract a reduced payout
- Conditions not on the policy's defined list are not covered
- Mental health conditions are typically excluded
- The policy only pays once — after a claim, cover ends
Income protection: the key facts
Income protection is arguably the most underused form of insurance in the UK. Statistics from the ABI show that 1 in 4 working-age people will suffer a long-term illness or injury that stops them working for at least 3 months during their career. State statutory sick pay is just £116.75 per week — roughly £6,000 per year. If you have a London mortgage, that will not cover even a fraction of your monthly costs.
A good income protection policy will replace 50–70% of your gross salary from the end of a waiting period (typically 4 weeks, 13 weeks, or 26 weeks) until you either return to work, reach a chosen claim limit, or reach a specified age — often retirement age.
Own occupation vs any occupation
The definition of "unable to work" is critical:
- Own occupation: pays if you cannot do YOUR specific job — the most generous and expensive definition
- Suited occupation: pays if you cannot do any job similar to your experience and training
- Any occupation: only pays if you cannot do ANY work at all — the harshest and cheapest definition
- For most professionals, we recommend own occupation cover — it provides genuine protection for your actual income and lifestyle
Which is right for you?
Both products serve different purposes and many people benefit from having both. If budget is tight, here is a rough guide:
Choose critical illness cover if you want a lump sum to clear your mortgage and you have some savings to cover day-to-day living costs. Choose income protection if you want ongoing cover that protects your salary and lifestyle for as long as you need. If you have dependants and a large London mortgage, a combination of life insurance, critical illness cover, and income protection provides the most comprehensive safety net.
Quick comparison table
Side-by-side summary of the key differences:
- Critical illness: pays a lump sum — income protection: pays monthly income
- Critical illness: specified conditions only — income protection: any illness or injury
- Critical illness: pays once then policy ends — income protection: pays until you recover or retire
- Critical illness: typically costs 3–5× life cover — income protection: typically 0.5–2% of annual salary per year
- Critical illness: good for clearing mortgage and debts — income protection: good for replacing your salary long-term
How much do they cost in 2026?
Critical illness cover: a healthy non-smoking 30-year-old can expect to pay £30–£50 per month for £200,000 of standalone critical illness cover. A combined life and critical illness policy of £300,000 typically costs £50–£80 per month for the same individual.
Income protection: premiums depend on your age, occupation, the waiting period, and the benefit amount. Shorter waiting periods cost more. Own occupation policies cost more than any occupation. A 30-year-old professional earning £50,000 might pay £40–£70 per month for £30,000/year of own occupation income protection to age 65.
We compare both products across 20+ leading UK insurers — including Aviva, Legal & General, Royal London, Scottish Widows, and Zurich — to find the right balance of cover and cost for your circumstances and budget.
Roger Cooper
CeMAP Qualified Mortgage Adviser | FCA Regulated
Roger has over 15 years of experience as an independent mortgage adviser. CeMAP qualified and FCA regulated, he specialises in complex mortgage cases including self-employed applicants, portfolio landlords, expat mortgages and high-value purchases across Greater London and the Home Counties.
All advice provided by Mortgage International is given by CeMAP qualified advisers regulated by the Financial Conduct Authority.