The long-run cost of private health cover.
Total premiums over the period
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Year 1 cost
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Final-year cost
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Topping up a public system, not replacing it
Private health insurance in New Zealand sits on top of a tax-funded public system, it does not replace it. Emergencies, accidents, cancer treatment and most acute care run through public hospitals regardless of whether you hold a policy. What you are buying with private cover is speed and choice for the elective stuff: a hip replacement without an eighteen month wait, a specialist consult in a fortnight rather than a quarter, a private room. For some people that is worth a lot, and for others it never gets used. This tool helps you weigh it by projecting the long-run cost rather than just the monthly premium, because the monthly figure is the part that lulls you.
The thing that makes health cover different from most insurance is that the premium is not flat. It climbs with age, and it climbs fastest in the years you are most likely to claim. Modelling that curve is the whole point of the calculator.
Why the premium curve bites later
The tool takes your current monthly premium, annualises it, then grows it each year by the increase rate you set. It sums every year to give a total, and reports both the first-year and the final-year cost so you can see how steep the climb is. The default 6 percent annual rise is deliberately realistic; medical inflation and age-banding together have pushed many New Zealand policies up by mid-single digits to low double digits a year. A premium that looks affordable at 40 can be uncomfortable at 60, which is exactly when you are most likely to need it and least likely to be able to switch insurers.
A $120 a month policy over 20 years
Say you pay $120 a month today, $1,440 a year, and assume premiums rise 6 percent annually. Over a 20 year horizon the calculator returns these figures.
| Point in the projection | Cost |
|---|---|
| Year 1 premium | $1,440 |
| Cumulative by year 10 | $18,980 |
| Final-year (year 20) premium | $4,357 |
| Total premiums over 20 years | $52,971 |
That $120 a month becomes more than $360 a month by year 20, and the lifetime spend lands near $53,000. None of it builds an asset; it is pure protection. The bars below trace the rising annual premium across the two decades.
Employer-paid premiums and the FBT angle
If your employer pays your health premium, it is a fringe benefit, and the employer generally pays Fringe Benefit Tax on it rather than you being taxed personally. That can make employer-funded cover an efficient perk, though the FBT cost is real to the business. Premiums you pay yourself are not tax-deductible and the payouts are not taxed, which is the usual pattern for personal insurance in New Zealand. There is no medical levy or surcharge to factor in the way some countries have, so the decision is purely a personal cost-versus-benefit one.
An expert nudge: lock in cover while you are young and healthy if you want it at all. Pre-existing conditions can be excluded if you join later, and the premium curve only steepens. Buying at 35 and holding is usually cheaper over a lifetime than buying at 55.
Should I just self-insure instead?
For some people, yes. If you have a solid emergency fund and could comfortably fund a private surgery out of savings, investing the premium difference can leave you ahead, especially if you rarely claim. The risk is a major elective need landing before your fund is built, or a chronic condition that makes future cover unaffordable. Self-insuring works best for disciplined savers with a healthy cash buffer.
Do premiums really rise every single year?
Most policies are repriced annually, and increases come from two sources: general medical inflation across all members, and your move into a higher age band. Younger members may see modest rises, but increases tend to accelerate from your fifties onward. Setting the growth rate to match your insurer’s recent letters gives the most honest projection.