Self-Insurance: When It Makes Sense and When It Doesn’t

Self-insurance is the decision to cover a risk from your own resources instead of paying an insurer to cover it for you. No policy, no premiums, no claims process. Just your own savings standing between you and whatever life delivers.

For most New Zealand households, self-insurance only makes sense in a narrow set of situations. Outside of those, it is usually a hidden and expensive risk, one whose true cost only becomes apparent after something has already gone wrong.

This guide is written primarily for working-age households weighing decisions about income, health, and family risk, though the framework applies at any stage of life.

Here is the reality check most articles on this topic skip. New Zealand has a unique set of conditions making the self-insurance decision more consequential than in many other countries. The Accident Compensation Corporation (ACC) covers injuries from accidents, but does not cover illness. If you develop cancer, suffer a heart attack, or are diagnosed with a degenerative condition, ACC pays nothing. Only about one in five New Zealanders carries income protection insurance, and the Financial Services Council estimates roughly 70% of New Zealanders are underinsured. Meanwhile, the latest published Health New Zealand data (as of early 2025) showed over 74,000 patients waiting longer than the four-month target for a first specialist assessment in the public hospital system. Anyone choosing to self-insure in this environment is making a bigger bet than they probably realise.

This article covers what self-insurance actually is, how it differs from having an emergency fund, when it genuinely makes sense, and when it puts households at serious financial risk.

How Insurance Works: The 60-Second Version

Insurance pools money from many people who each pay a regular, manageable amount. When something bad happens to one member of the pool, the insurer pays out from the collective fund. Because not everyone claims at the same time, and many never claim at all, the maths works. You trade a known cost (the premium) for protection against an unknown, potentially catastrophic one.

The insurer earns a margin for managing the pool, assessing risk, and investing premiums. This margin is what makes self-insurance appear attractive: cut out the middleman and keep the savings. The catch, as we will see, is in the word "keep."

What Self-Insurance Actually Is

Self-insurance is a deliberate decision not to hold an insurance policy for a particular risk. Instead, you accept full financial responsibility for the consequences if the event occurs. Your savings are your own claims fund.

The term is slightly misleading. There is no insurance involved at all. No underwriter has assessed the risk, no reinsurer stands behind you, and no regulator monitors the adequacy of your reserves. In professional and actuarial circles, the formal concept is risk retention: the conscious decision to keep a risk on your own balance sheet rather than transfer it. Insurance advisers and actuaries use this language when modelling the decision, and it is worth knowing because it frames the choice more honestly. You are not insuring yourself. You are choosing to carry the exposure.

The logic is straightforward. Over time, an insurer must collect more in premiums than it pays in claims. If you retain the risk and nothing goes wrong, you save the premium. If something goes wrong but the cost is small, you are still ahead. The model breaks down when the cost of the event is large enough to alter the course of your financial life.

Self-Insurance Is Not the Same as Having an Emergency Fund

This is where most people, and most articles, get confused. An emergency fund and self-insurance sound similar, but they serve entirely different purposes.

• ‍An emergency fund is a contingency reserve. It sits alongside your insurance policies, not instead of them. Its job is to cover what insurance does not or cannot cover: the excess on a claim, a washing machine dying, an unexpected car repair, a redundancy, or the waiting period before income protection payments begin (typically around 13 weeks). Everyone needs one, regardless of what insurance they hold.‍
• Self-insurance is the absence of a policy. It means you have looked at a specific risk, decided not to transfer it to an insurer, and accepted you will bear the full cost yourself. There is no backstop. If you self-insure against a serious health event and it happens, you pay the entire bill from your own pocket. There is no excess to manage because there is no policy to claim on.

The distinction matters because people sometimes convince themselves they are self-insured when they really just have a modest emergency fund and no insurance. Three months of expenses in a savings account is a sensible contingency buffer. It is not a substitute for a $500,000 life insurance payout or two years of income replacement. Calling it self-insurance does not change what it can and cannot cover.

When Self-Insurance Genuinely Makes Sense

Applied to the right risks, self-insurance is a rational and sometimes optimal decision. Here are the three situations where it most commonly works.

1. Small, Frequent, Predictable Losses

Some risks are more irritating than dangerous. A stone chip on a windscreen. A phone screen cracking. A minor plumbing repair. The cost of these events is small enough to absorb from cash flow or an emergency fund, and the premiums to insure against them frequently cost more than the repairs over time.

Extended warranties on electronics are a textbook example. The retailer charges a premium precisely because the expected cost of claims is low. You are almost always better off setting aside the purchase price of the warranty and funding any repairs yourself. This is self-insurance at its most sensible: retaining small, manageable risks where the insurer’s margin makes the premium poor value.

2. When Your Wealth Has Outgrown the Risk

A couple in their early sixties with a paid-off home, no dependants, and a well-diversified investment portfolio may not need the same level of life insurance they carried at 35. If the financial impact of one partner dying can be absorbed from existing assets without forcing a fire sale or degrading their standard of living, the life insurance premium might be redirected toward strengthening liquidity or funding retirement spending.

To be clear, the point is to redeploy capital toward maintaining adequate reserves and financial resilience, not to chase investment returns with freed-up premium dollars.

Two important caveats. First, this decision needs to be based on actual numbers. In practice, this is the decision we most often see households get wrong, usually by underestimating the financial impact of an event and overestimating their readiness to absorb it. A proper financial plan will pressure-test assumptions you might otherwise gloss over. Second, the transition should be gradual. Dropping all cover in a single year because premiums feel expensive is not self-insurance. It is just being uninsured.

Consider, for example, a couple at 63 with a $2 million investment portfolio, no mortgage, and adult children who are financially independent. Their life insurance premiums have risen to $8,000 a year as they have aged. The sum insured is $400,000, which was calculated years ago when they still had a mortgage and school-aged children. In their current position, neither partner would face financial hardship if the other died. The premium savings over the next decade, invested conservatively, would add roughly $100,000 to their retirement pool. For this household, cancelling life cover and self-insuring is a rational, numbers-driven decision. The important point: the arithmetic justified the choice.

3. The Smart Blend: Raising Your Excess

One of the most underused applications of self-insurance is voluntarily raising the excess on existing policies. You retain the first portion of any claim, say $1,000 or $2,500 instead of $500, and the insurer absorbs the rest.

The premium reduction can be meaningful. A useful rule of thumb when evaluating the tradeoff: compare the annual premium saving against the increased excess, then ask how often you have actually claimed in the past five to ten years. If you have claimed once or never, the accumulated savings from a higher excess will very likely exceed the extra you would pay in a future claim. If you claim frequently, a higher excess may not suit your situation. The key is to run the numbers.

This approach is arguably the best of both worlds. You keep insurance for the events capable of changing your financial trajectory, reduce your premiums, and build the discipline of maintaining a contingency fund to cover the higher excess when needed. It is risk retention for the small stuff and risk transfer for the big stuff, exactly where each tool works best.

When Self-Insurance Is a Dangerous Gamble

This is where most people get this wrong. For every situation where self-insurance is rational, there are several where it creates serious and avoidable financial exposure.

You Have a Mortgage and Dependants

A 35-year-old with a young family and a $600,000 mortgage is in no position to self-insure against death or long-term disability. Life insurance at this age is remarkably affordable, often just a few dollars a day for cover sufficient to repay the mortgage, fund living expenses for a surviving partner, and provide for children’s education. No amount of budgeting discipline will allow a young family to accumulate a reserve large enough to replicate a life insurance payout. The maths does not work, and the consequences of being wrong fall entirely on the people who had no say in the decision.

Income Protection: The Risk New Zealand Ignores

For most working-age New Zealanders, the single most valuable asset is not the house. It is the ability to earn an income. A 35-year-old earning $120,000 a year has roughly $3.6 million in gross future earnings ahead of them before retirement. This is an illustrative figure to convey magnitude, not a forecast, but it makes the point: your earning capacity dwarfs almost every other asset you own.

Yet the FSC’s research consistently finds only about 20% of New Zealanders have insured their income against sickness or disability. Stats NZ cohort life tables show approximately 6.5% of men and 3.5% of women are expected to die before reaching 60, and the probability of a period of serious illness or disability during working years is considerably higher. Two in five New Zealanders could not access $5,000 in an emergency.

This is where New Zealand’s specific conditions bite hardest. ACC covers injuries caused by accidents. If you break your leg skiing, ACC contributes toward treatment and lost earnings. But ACC does not cover illness. Cancer, stroke, heart disease, chronic fatigue, autoimmune conditions: none qualify. If you cannot work because of illness, ACC will not pay a cent. The gap between ACC coverage and public assumption is a persistent and dangerous blind spot in New Zealand personal finance.

Self-insuring against lost income due to illness requires a reserve large enough to cover all household expenses, mortgage repayments, and living costs for potentially years. For a household earning $150,000, even a 12-month reserve would need to be well over $100,000 in accessible cash, before accounting for the longer recovery periods many serious illnesses demand. Few households have anything close to this in liquid savings. Income protection exists precisely because this risk is too large and too unpredictable for most people to absorb.

If you are uncertain whether your current financial position could withstand a prolonged period without earned income, running a detailed financial model can give you the answer. For some, this is one of the most common and most valuable exercises in a financial planning engagement.

Health Insurance: The Waiting List Reality

New Zealanders sometimes assume the public health system will catch them if they fall. For emergencies, it generally does. For everything else, the picture is more sobering.

The latest published Health New Zealand figures (as of early 2025) showed over 74,000 patients waiting longer than four months for a first specialist assessment. More than 37,000 were overdue for treatment. Orthopaedics, ophthalmology, general surgery, and gynaecology recorded the highest volumes of delays. These are substantial procedures. A hip replacement, cataract surgery, or the removal of a gallbladder can transform someone’s quality of life, and in some cases their ability to work and earn.

The public system will get there, but "there" can mean months or years of pain, reduced mobility, and lost income. In some cases, patients whose conditions are not scored as sufficiently severe may not qualify for the waiting list at all, leaving them to choose between paying the full cost of private surgery, which can easily exceed $30,000 for relatively common procedures, or waiting until their condition deteriorates enough to re-qualify.

Private health insurance short-circuits the waiting game. It also provides access to specialist drugs and treatments not funded through Pharmac, including certain cancer treatments. For anyone considering self-insuring against healthcare costs, the question is whether you can afford a five-figure surgical bill and the lost earnings while you wait.

A Practical Framework for the Decision

Rather than treating self-insurance as all-or-nothing, think of it as a spectrum. Every risk in your life sits somewhere on a scale from trivial to catastrophic. The goal is to match the right tool to the right risk.

Three questions cut through most of the complexity:

1. Could this event force the sale of major assets, create unmanageable debt, or leave dependants without support? Transfer the risk. Buy the insurance. This applies to life cover while you have dependants, income protection while you rely on earned income, and your home while you have a mortgage.
2. Could this event cause real financial discomfort but not ruin me? Blend the approach. Keep insurance but raise the excess. Absorb the first layer of loss; let the insurer handle the rest.
3. Is this event annoying but financially manageable from cash reserves? Self-insure. Redirect the premium into your emergency fund or broader savings. Extended warranties, low-value contents cover, and pet insurance often fall here.

The framework is deliberately simple. The difficulty lies in being honest about which category each risk falls into. People consistently overestimate their financial resilience and underestimate the cost of adverse events.

The Self-Insurance Trap: Why We Get This Wrong

There is a well-documented tendency in behavioural finance for people to believe adverse events happen to other people. Psychologists call it optimism bias. It shows up everywhere: in retirement savings assumptions, renovation budgets, business forecasts, and insurance decisions. New Zealand’s underinsurance statistics are, at least in part, a product of collective optimism bias operating at a national scale.

Self-insurance appeals to the same instinct. It feels proactive and financially savvy. You are keeping your money instead of handing it to a corporation. The premium savings are tangible and immediate; the risk you are retaining is abstract and distant. But the decision should be driven by a rational assessment of probability and consequence.

In practice, the people who self-insure successfully tend to be the ones who least need to. They have substantial wealth, diversified assets, low debt, and no dependants. Everyone else is making a bet, and the stakes are higher than the premium savings suggest.

The Emergency Fund: The Foundation Everyone Needs

Regardless of what formal insurance you hold, every household benefits from a dedicated emergency fund. Three to six months of essential expenses, held in cash or near-cash, is the bedrock of personal financial resilience.

To be clear: an emergency fund is not self-insurance, and it is not a substitute for proper cover. It is the contingency buffer sitting alongside your insurance programme. It pays the excess on a claim. It covers the 13-week stand-down period before income protection payments begin. It absorbs the uninsurable disruptions: a redundancy, a boiler replacement, an urgent trip home for a family emergency. It is the layer between a rough patch and a genuine crisis.

The emergency fund and the raised-excess approach described earlier work hand-in-glove. Raise your excesses, reduce your premiums, and maintain the cash reserve to cover those higher excesses when needed. You keep insurance for the catastrophic risks, fund the small losses yourself, and the premium savings compound over time. Methodical, disciplined, and effective.

Frequently Asked Questions

Can I self-insure for everything if I have enough money?

In theory, yes. In practice, even high-net-worth individuals typically retain insurance for catastrophic and liability risks, because the premium is trivial relative to the potential loss. Self-insuring a $10 million home against a total loss requires $10 million in accessible reserves earmarked for a single event. Most people, even wealthy ones, would rather pay a comparatively modest premium and deploy their capital elsewhere. The threshold is: "is the premium a better use of funds than holding idle reserves?"

Does ACC cover me if I get sick?

No. ACC covers injuries caused by accidents only. Illness, including cancer, heart disease, stroke, and chronic conditions, falls entirely outside ACC’s scope. If illness prevents you from working, ACC provides no income replacement. This is one of the most commonly misunderstood aspects of New Zealand’s social safety net, and one reason income protection insurance is more important here than many people realise.

Is there a good time of life to start self-insuring?

The answer shifts as your financial position evolves. In your thirties and forties, with a mortgage, dependants, and decades of earning ahead, self-insuring against major risks is very rarely appropriate. As you approach and enter retirement, with the mortgage cleared, children independent, and a substantial portfolio in place, some cover naturally becomes less critical. The transition should be gradual, deliberate, and grounded in actual numbers. Dropping a policy because the premium feels expensive is just being uninsured.

Should I cancel health insurance if I am fit and healthy?

Fitness today does not guarantee fitness tomorrow. More importantly, health insurance becomes dramatically more expensive, or in some cases unavailable, if you try to purchase it after a diagnosis. Pre-existing condition exclusions can leave you worse off than if you had never held a policy at all. The premiums you pay in your healthy years are the price of guaranteed access when you need it most. We have written a detailed piece on why cancelling health insurance can backfire.

Self-Insurance In NZ: When It Makes Sense and When It Doesn’t

Self-insurance is a legitimate tool when applied to the right risks. For small, predictable, financially manageable events, it can save you real money over a lifetime. For large, unpredictable, life-altering events, it creates exactly the kind of exposure insurance was invented to prevent.

New Zealand’s particular conditions raise the stakes. ACC’s illness gap leaves working-age households more exposed than most people realise. Public hospital waiting lists add real financial and personal cost to health events. A national underinsurance rate near 70% means most households are carrying more risk than they have planned for. These are the backdrop against which every self-insurance decision plays out.

The smartest approach is not to insure everything or to insure nothing. It is to be deliberate. Know which risks can hurt you. Transfer those. Know which ones you can absorb. Retain those. Build the emergency fund. Raise your excesses where the numbers support it. And revisit the mix as your circumstances change, because the right balance at 30 will not be the right balance at 55.

If you want to know where you actually stand, we are happy to help. Get in touch for a no-cost initial conversation. It could be the most valuable hour you spend this year, if only for the clarity of knowing the right risks are covered and you are not paying for the ones you do not need.