Insurance is supposed to provide financial protection and peace of mind, yet thousands of New Zealanders unknowingly make critical mistakes that leave them underinsured, overpaying, or worse—discovering they're not covered when they need it most.
From underestimating earthquake risks to not comparing quotes annually, these common errors cost Kiwi families dearly in unnecessary premiums and uncovered losses. The good news? Every single mistake is preventable with the right knowledge.
This guide reveals the 10 most expensive insurance mistakes New Zealanders make across car, health, home, life, travel, pet, and business insurance. More importantly, you'll learn exactly how to avoid each one, potentially saving thousands of dollars while ensuring you have the protection you actually need.
Not Comparing Quotes Annually
The Mistake:
Setting and forgetting your insurance policies, staying with the same provider year after year without checking if you're getting a competitive price. Many New Zealanders rarely or never compare their insurance quotes.
Why It's Costly:
Insurance companies often reward new customers with discounted rates while gradually increasing premiums for loyal existing customers. This "loyalty tax" means you could be paying meaningfully more than someone with identical coverage from a competitor. For a typical family with car, home, and health insurance, this mistake can cost a significant amount each year.
Insurers bank on customer inertia—the tendency to stick with the status quo rather than shop around. They know most people won't bother comparing quotes each year, allowing them to increase premiums well above inflation without losing customers. Meanwhile, they offer aggressive discounts to attract new business, creating a two-tier pricing system that penalizes loyalty.
How to Avoid It:
- ✓Set an annual calendar reminder 6-8 weeks before your policy renewal to compare quotes from at least 3-5 providers.
- ✓Use comparison websites like InsureNZ to get multiple quotes in minutes rather than contacting each insurer individually.
- ✓Don't just compare price—review coverage limits, excesses, exclusions, and claim processes to ensure like-for-like comparisons.
- ✓Negotiate with your current insurer using competitor quotes as leverage—many will match or beat competitor pricing to retain you.
- ✓Consider switching providers every 2-3 years to take advantage of new customer discounts, even if you negotiate better rates with your current insurer.
Underinsuring Your Home and Contents
The Mistake:
Setting your home and contents insurance sum insured too low, either to save on premiums or because you haven't updated values as building costs and possessions have increased. This is particularly common with contents insurance where people significantly underestimate what they own.
Why It's Costly:
If your home is underinsured and suffers major damage or total loss, you may only receive a percentage of the actual rebuild cost, potentially leaving you tens or hundreds of thousands of dollars short. Many insurers include "average clauses" meaning if you're materially underinsured they'll only pay a proportional share of any claim, even small ones.
Building costs in New Zealand have risen sharply in recent years due to supply-chain issues, labour shortages, and material costs (see Stats NZ construction cost indices). Households also commonly underestimate the value of their contents — a full inventory often surprises owners.
Illustrative example: A family insures their home for its purchase price. After a fire, the rebuild cost turns out to be significantly higher. Under a sum-insured policy with an average clause, the insurer pays only a proportion of the claim, leaving the household well out of pocket.
How to Avoid It:
- ✓Use a rebuild cost calculator from your insurer or get a professional quantity surveyor assessment to determine accurate rebuild costs — not market value.
- ✓Review and update your sum insured annually to account for building cost increases, renovations, and inflation. Most insurers suggest reviewing at every renewal.
- ✓Create a detailed contents inventory room by room, photographing valuable items. Most households are surprised by how much more they own than they had estimated.
- ✓Consider "sum insured plus" or replacement value policies that automatically adjust for inflation and building cost increases without annual reviews.
- ✓Specify valuable items separately — jewellery, art, and high-value electronics may have per-item limits under standard contents policies. Check the policy wording.
Ignoring NZ-Specific Risks: Earthquakes, Flooding, and Landslips
The Mistake:
Assuming standard insurance automatically covers New Zealand's unique natural disaster risks, particularly earthquakes, flooding, and landslips. Many Kiwis don't understand what EQC covers versus private insurance, or they decline optional flood/landslip cover to save money.
Why It's Costly:
The Toka Tū Ake EQC (formerly Earthquake Commission) provides natural-disaster cover up to set caps for residential building and land damage — your private insurer covers above that. EQC doesn't cover flooding — you need specific flood cover from your private insurer, which many policies exclude unless explicitly added. See the EQC and ICNZ websites for current caps and definitions.
New Zealand faces regular earthquake activity, and climate change is increasing flood risk nationwide (see GNS Science and NIWA for hazard data). Many NZ properties sit in identified flood-hazard zones — check your council's hazard map.
Illustrative example: After a major earthquake, homeowners who relied on EQC-only style cover found their reinstatement bill far exceeded the EQC cap, leaving a large shortfall their private policy didn't fill.
How to Avoid It:
- ✓Ensure your private insurance covers above the EQC cap so you have full replacement cover for earthquake damage — confirm current caps with EQC and your insurer.
- ✓Check council flood maps at your local council website to understand your property's flood risk, then ensure you have appropriate flood cover if at risk.
- ✓Add flood and landslip extensions to your policy if you're in a high-risk area — additional cost varies by insurer and risk zone, confirm with the insurer.
- ✓Understand the difference between natural and storm-water flooding — many policies cover storm-water but exclude river/sea flooding unless specifically added.
- ✓Review coverage after major NZ natural disasters as insurers often change terms, excesses, and availability of cover in affected regions.
Delaying Health Insurance Until You're Older
The Mistake:
Waiting until your 40s or 50s to purchase health insurance, thinking you'll save money by avoiding premiums while you're young and healthy. By the time you decide you need coverage, pre-existing conditions have developed and premiums are significantly higher.
Why It's Costly:
Health insurance premiums in New Zealand are age-based and increase substantially as you get older. More critically, any health conditions that develop before you join are typically considered pre-existing and are either excluded from coverage or subject to premium loadings.
Premiums are much lower for someone joining in their 20s or 30s than for someone joining in their 50s. Waiting also exposes you to the risk of developing common conditions (diabetes, high blood pressure, etc.) in the meantime, which then become exclusions or loadings.
Lifetime cost intuition: Someone who joins earlier and keeps continuous cover usually pays less per year and avoids pre-existing-condition exclusions that meaningfully reduce a late-joiner's policy value.
How to Avoid It:
- ✓Start health insurance earlier in life or as soon as financially feasible — premiums tend to be lowest, and you'll lock in coverage before any conditions develop.
- ✓Begin with basic surgical cover if budget is tight rather than waiting to afford comprehensive cover.
- ✓Maintain continuous coverage once you start—even if you need to downgrade coverage temporarily, keeping some insurance prevents pre-existing condition issues.
- ✓Understand that after a qualifying period of continuous coverage (varies by insurer), new conditions that develop are typically covered — this is the key benefit of joining early.
- ✓Calculate lifetime costs, not just current premiums — paying earlier in life is generally cheaper over a lifetime than starting later with limited coverage.
Not Disclosing Information or Vehicle Modifications
The Mistake:
Failing to disclose important information to your insurer, whether it's health conditions, previous claims, traffic violations, or vehicle modifications. Many people also "forget" to mention changes during the policy period, such as installing a turbo or getting a speeding ticket.
Why It's Costly:
Non-disclosure or misrepresentation gives insurers grounds to deny your entire claim, even if the undisclosed information isn't related to the claim. This is called "material non-disclosure" and it voids your policy. You lose all your premiums paid and receive nothing when you need the insurance most.
For car insurance, this commonly involves modifications. A simple aftermarket exhaust, lowered suspension, or performance chip should be declared. For health insurance, failing to mention a past medical condition — even if minor — can result in claim denial. Non-disclosure is a recurring theme in disputes handled by the Insurance & Financial Services Ombudsman (see IFSO).
Illustrative example: A driver installs a turbo on their vehicle but doesn't update the insurer. After an accident, the insurer relies on the undisclosed modification to deny the entire claim — the driver loses their premium and is left to fund all the repair costs themselves.
How to Avoid It:
- ✓Disclose everything when applying—if you're unsure whether something matters, declare it anyway. Let the insurer decide its relevance.
- ✓Notify your insurer promptly of any changes — modifications, traffic infringements, address changes, new drivers, medical diagnoses.
- ✓Keep written records of all disclosures and insurer responses—emails, letters, or notes from phone calls confirming what you've disclosed.
- ✓Review your policy document when it arrives to ensure all disclosed information is correctly recorded — errors happen and need to be corrected immediately.
- ✓Understand that "I forgot" or "I didn't think it mattered" are not valid defences — the duty of disclosure is on you, and ignorance provides no protection.
Having Inadequate Life Insurance Coverage
The Mistake:
Relying solely on employer-provided life insurance (often only a multiple of annual salary) or having no life insurance at all. Many Kiwis assume ACC will cover their family if something happens, not realising ACC only covers accidents and has limited payouts.
Why It's Costly:
Inadequate life insurance leaves your family financially vulnerable if you die or become seriously ill. ACC provides set payments for accidental death and weekly compensation up to a cap (see ACC for current rates), but does not cover death from illness — which accounts for the majority of NZ deaths (see Stats NZ leading-causes-of-death data).
A common financial-adviser rule of thumb is life insurance cover equal to a multiple of your annual income plus enough to pay off the mortgage. The right figure for any household depends on income, dependants, debt, and other savings — discuss with a licensed adviser.
Illustrative example: An employer-provided life-insurance payout is enough to cover funeral costs and a few months of mortgage payments, but not enough to clear the mortgage or sustain the surviving family — they end up needing to sell the home.
How to Avoid It:
- ✓Calculate your coverage need properly: mortgage balance + a multiple of annual income + children's education costs + a buffer for living expenses. A licensed adviser can help you size this for your circumstances.
- ✓Don't rely on employer insurance alone — it ends when you leave your job, and the cover is rarely enough to clear a mortgage. Hold your own policy you control.
- ✓Consider trauma insurance alongside life insurance — it pays out on diagnosis of serious illness (heart attack, cancer, stroke) while you're still alive.
- ✓Review coverage regularly and after major life events — marriage, children, mortgage increase, income growth all warrant coverage adjustments.
- ✓Include income protection insurance if you're the main earner — it pays a regular benefit (typically a portion of your income) if illness or injury prevents you from working.
Choosing the Wrong Excess to Save Money
The Mistake:
Selecting an extremely high excess to reduce premiums without considering whether you could actually afford to pay it when making a claim. The opposite mistake—choosing zero or very low excess—means overpaying on premiums for small potential savings.
Why It's Costly:
An excess you can't afford defeats the purpose of insurance. If you set a very high excess to chase a premium saving but don't keep that amount in savings, you can't actually claim when you need to. Conversely, a very low excess can cost meaningfully more in premium every year — it can take many claim-free years to justify the extra cost.
The ideal excess balances premium savings with your financial capacity. Raising the excess usually reduces the premium, but the saving diminishes at the top end while your out-of-pocket risk keeps climbing — confirm specific premium savings with the insurer.
Illustrative example: A household sets a very high excess on their home insurance to chase a premium saving. When a storm damages their roof, they don't have the cash to pay the excess and have to defer the repair, which then leads to additional water damage that could have been avoided.
How to Avoid It:
- ✓Set your excess at an amount you can comfortably pay from savings without financial stress.
- ✓Calculate the break-even point — divide the extra excess you'd pay if you claim by the annual premium saving to see how many claim-free years justify the higher excess.
- ✓Build an emergency fund equal to your excess before increasing it to save on premiums — this ensures you can always afford to claim.
- ✓Consider different excesses for different policies — a higher excess on car insurance (where you can defer repairs) may suit, while a lower excess on home insurance can be safer because some repairs can't wait.
- ✓Review excess levels annually as your financial situation changes — increase it as your savings grow, or reduce it if finances tighten.
Cancelling Travel Insurance to Save a Few Dollars
The Mistake:
Skipping travel insurance to save a relatively small amount, or assuming your credit card travel insurance provides adequate coverage for international trips. Many Kiwis also make the mistake of not reading policy exclusions and assuming everything is covered.
Why It's Costly:
Medical emergencies overseas can cost a great deal — a hospital stay in the US can run into the hundreds of thousands of dollars, while medical evacuation from Asia or the Pacific can also be very expensive. Trip cancellations due to illness or emergencies can mean losing the cost of non-refundable bookings.
Credit card travel insurance often has significant limitations: maximum trip lengths, coverage only if you paid for the trip with that card, pre-existing condition exclusions, and lower medical-cover limits than dedicated policies. Many travellers discover these limitations only when trying to claim — read the policy wording before relying on it.
Illustrative example: A family skip travel insurance to save a small amount, then a child suffers an injury overseas requiring surgery and hospitalisation. The resulting medical bill runs into the tens or hundreds of thousands and the family is left to pay it off for years.
How to Avoid It:
- ✓Never travel internationally without insurance — budget for it as part of your trip cost.
- ✓Ensure high medical coverage limits for US/Canada/Europe trips, and meaningful cover for Asia/Pacific destinations. Compare policy limits before buying.
- ✓Review credit card policy documents carefully — most provide only basic cover. For comprehensive protection, purchase a dedicated travel insurance policy.
- ✓Declare all pre-existing medical conditions — many policies can cover them for an additional premium, but failing to declare voids coverage.
- ✓Consider annual multi-trip policies if you travel more than once a year — they typically cost more than a single-trip policy but cover unlimited trips, which can be better value for frequent travellers.
Not Reading Policy Documents and Exclusions
The Mistake:
Accepting policies without reading the full policy document, relying instead on marketing materials or verbal assurances from sales staff. Most Kiwis only read their policy when making a claim, discovering exclusions and limitations too late.
Why It's Costly:
Policy exclusions can render your insurance worthless for the exact scenario you assumed was covered. Common exclusions that surprise people include: gradual damage (wear and tear), intentional acts by household members, damage while property is unoccupied for an extended period, and specific high-value items without separate specification.
Marketing materials highlight what's covered but rarely emphasise what's excluded. Sales conversations focus on benefits, premium, and getting you to sign up. The critical details — conditions, limitations, sub-limits, waiting periods — sit in the policy wording that most people never read.
Illustrative example: A homeowner assumes their contents insurance covers a valuable engagement ring. When it's stolen, they discover the policy has a per-item jewellery sub-limit and the payout is much less than the ring's value — because the item wasn't separately specified.
How to Avoid It:
- ✓Read the full policy document when it arrives, paying special attention to the "Exclusions," "Conditions," and "Definitions" sections.
- ✓Create a summary of key exclusions and limits for each policy and keep it accessible—you'll refer to it when situations arise.
- ✓Ask specific "What if" questions before purchasing: "What if my home is unoccupied for 3 months?" "What if a family member causes damage?" Get answers in writing.
- ✓Check sub-limits for specific items — most policies limit coverage for jewellery, electronics, bikes, and tools to a sub-limit unless specified separately.
- ✓Challenge unclear terms before accepting the policy — if something is ambiguous or confusing, get clarification in writing from your insurer.
Letting Business Insurance Lapse or Never Getting It
The Mistake:
Small business owners and self-employed Kiwis operating without proper business insurance—public liability, professional indemnity, business interruption—or letting policies lapse during tough financial periods to save money.
Why It's Costly:
A single lawsuit, major client complaint, or business interruption event can bankrupt an uninsured business. Public liability and professional indemnity claims can easily run into the tens or hundreds of thousands of dollars. Business interruption from fire or natural disasters can result in months of lost income with ongoing expenses (see ICNZ for NZ context).
Many business owners mistakenly believe their home and contents insurance covers business equipment and liability — it doesn't. Others think they're too small to need insurance, but client lawsuits, accidents on your premises, or data breaches affect businesses of all sizes. Some incorrectly assume ACC covers everything — it only covers personal injury, not property damage or liability.
Illustrative example: A marketing consultant without professional indemnity insurance gives a client incorrect advice on a campaign. The client sues successfully, and the consultant has to fund the entire settlement themselves — losing their business and personal savings in the process.
How to Avoid It:
- ✓Get public liability insurance from day one — essential for any business with customer interactions. Premiums vary based on industry and turnover — request a personalised quote.
- ✓Professional indemnity is essential for service businesses — consultants, advisers, and contractors should hold this protection against claims of negligent advice.
- ✓Business interruption insurance protects income if you can't operate — covers ongoing costs and lost revenue for an indemnity period after insured events (period varies by policy).
- ✓Insure business equipment, stock, and premises separately from personal insurance — home policies exclude business use and commercial property.
- ✓Don't let insurance lapse during financial difficulties — this is precisely when you need protection most. Consider reducing coverage rather than cancelling entirely.
Quick Reference: 10 Mistakes Summary
| # | Mistake | Why it hurts | Quick Fix |
|---|---|---|---|
| 1 | Not comparing quotes annually | Loyalty tax on existing customers | Set calendar reminder to compare |
| 2 | Underinsuring home & contents | Average clause may reduce payout | Use rebuild calculator, review annually |
| 3 | Ignoring NZ disaster risks | EQC cap is well below rebuild cost | Add earthquake/flood cover above EQC |
| 4 | Delaying health insurance | Pre-existing-condition exclusions stack up | Join earlier in life before conditions develop |
| 5 | Not disclosing information | Entire claim may be denied | Disclose everything, keep records |
| 6 | Inadequate life insurance | Mortgage and dependants left exposed | Size cover to mortgage + income multiple |
| 7 | Wrong excess amount | Can't afford to claim when you need to | Set excess you can afford from savings |
| 8 | Skipping travel insurance | Overseas medical bills can be huge | Never travel internationally uninsured |
| 9 | Not reading policy documents | Sub-limits and exclusions surprise on claim | Read full policy, note exclusions |
| 10 | No business insurance | A single claim can sink the business | Get liability insurance from day one |
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