This is the question we hear most often from people who have just finished arranging their health insurance: "What about critical illness — do I need that too?" The short answer is "it depends on your gap." This article makes "it depends" concrete, with a three-part test you can answer yourself in ten minutes. (For the basic differences between the two products, see our comparison article.)
A one-minute recap: these two do different jobs
Health insurance pays the treatment bill to the hospital. Critical illness insurance pays a free lump sum to you when a condition covered by the terms is diagnosed. So someone with health cover alone has closed only the first half of the damage. The second half is the income that stops, the expenses with no bill attached, and a life that must carry on through a long course of treatment. "Should I add it?" therefore means: "is anything covering my second half yet?"
The three-part gap test
1: If your income stopped for a year, what would keep the household going? Answer it as a real list — how many months of reserve, how much sick leave or social security compensation, could a partner carry it alone? If the total comes to less than 12 months → there is a gap.
2: Who depends on your income? Young children, parents, or debts that have to be paid every month. The more people depending on you, the greater the damage from not working → the larger the gap.
3: What is your family history and your own risk behaviour? Is there cancer, heart disease or stroke among immediate relatives? Do you smoke, or carry excess weight? → the probability on your side is above average.
If you answer "there's a gap" to two or more: critical illness cover is the next piece to consider seriously. If all three are clear: read the next section.
Who can genuinely say "I'm fine" without feeling guilty
Fairness requires saying it: some people really can skip it. Someone with liquid assets substantial enough to absorb years of lost income (self-insuring the second half). Someone with no dependants and a very deep reserve. Or someone whose premium budget is so tight that adding it would thin out the core health cover. For that last case the rule is clear: never reduce the IPD limit in order to buy critical illness cover. The foundation always comes before the additional layer. Keep it as a goal for a year when income grows.
If you do add it, how much to start with
The sum-insured principle we always recommend: three to five years of income as a starting point, then adjusted for real obligations. On a limited budget, start with a small sum and increase it over time — better than waiting until you are fully ready, by which point the health window may have closed. And use the three reading points from our "3 things to know" article: the definitions and the disease stages that pay, the timing conditions, and whether the structure pays once or multiple times [check the conditions in the policy].
Where it sits in the bigger picture
Critical illness cover's position in the portfolio: after you have (1) an emergency fund, (2) IPD health insurance with a genuinely adequate limit, and (3) life cover matching your obligations, critical illness is the fourth layer that turns a "good" portfolio into a "complete" one. For a household's main earner aged 35 and above, this layer carries more weight as the risk statistics climb.
In short
Should someone with health insurance add critical illness cover? Answer with your own gap: could you survive a year without income, who depends on you, and how high is your personal risk? Where there is a gap, fill it with a sum you can genuinely start with. Where there is none, consider the test passed. If you would like help going through the three with your real numbers, message us on LINE any time.
This article was inspired by material from the Thai Financial Planners Association (TFPA) and has been entirely rewritten.