Insurance CPI Indexation NZ: Auto-Increase Guide | QuoteHub

By QuoteHub Editorial Team · Updated 2025-12-09

Insurance CPI Indexation NZ: Should Your Cover Increase Automatically?

If you have life insurance, trauma cover, or income protection in New Zealand, there is a good chance your sum insured increases every year without you doing anything. This automatic adjustment is called CPI indexation, and it is built into most personal risk insurance policies sold in this country.

The idea behind it is simple: inflation erodes the value of money over time, so your insurance cover needs to keep pace. But CPI indexation also means your premiums go up every year, and many policyholders do not fully understand why their costs are rising or whether the automatic increases are still appropriate for their situation.

This guide explains exactly how CPI indexation works on NZ insurance policies, how it affects your premiums, when it makes sense to keep it, and when turning it off could save you money without leaving you underinsured.

What Is CPI Indexation on Insurance?

CPI stands for Consumer Price Index. It is a measure of inflation published quarterly by Stats NZ, tracking the average change in prices paid by New Zealand households for goods and services.

When your insurance policy has CPI indexation enabled (which is the default on most policies), your sum insured automatically increases each year in line with the annual change in the CPI. The increase is applied at your policy anniversary date.

The key benefit is that this increase happens without medical underwriting. You do not need to answer health questions, provide blood tests, or disclose any new medical conditions. Your cover simply goes up to reflect the reduced purchasing power of the dollar. This is significant, because if you tried to increase your cover manually after developing a health condition, the insurer could decline the increase, apply exclusions, or charge a loading.

For most policies in New Zealand, CPI indexation applies to:

How CPI Indexation Affects Your Premiums

This is where many people get caught off guard. When your sum insured increases via CPI indexation, your premium also increases. But the premium increase is not simply equal to the CPI percentage. It is driven by two separate factors working together.

Factor 1: The increased sum insured

If your life insurance cover goes from $500,000 to $515,000 (a 3% CPI adjustment), you are now insured for a higher amount. The premium for that additional $15,000 of cover is calculated at your current age and health loading, not the age you were when you first took out the policy.

Factor 2: The age-based rate change (for stepped premiums)

If you are on stepped premiums, your rate per unit of cover also increases each year as you get older. So you face a double increase: a higher sum insured multiplied by a higher per-unit rate.

On level premiums, the per-unit rate stays the same, but you still pay more because the sum insured itself has grown.

The compounding effect

These increases compound year on year. A 3% CPI adjustment might sound modest, but over 10 or 20 years the cumulative effect is substantial, both on your sum insured and on your premiums.

Example: The 10-Year Impact of CPI Indexation

Consider a 35-year-old with $500,000 of life insurance on stepped premiums, paying $40 per month. Assuming an average CPI increase of 3% per year, here is how both the sum insured and the premium change over a decade.

Year Sum insured Approximate monthly premium
Year 1 $500,000 $40
Year 2 $515,000 $43
Year 3 $530,450 $47
Year 4 $546,364 $51
Year 5 $562,755 $55
Year 6 $579,637 $60
Year 7 $597,026 $65
Year 8 $614,937 $71
Year 9 $633,385 $77
Year 10 $652,387 $84

By year 10, the sum insured has grown by over $152,000 and the monthly premium has more than doubled. The premium increase is steeper than the sum insured increase because of the age-based stepped premium component layered on top.

On level premiums, the premium increase would be more moderate (driven only by the higher sum insured, not age), but there would still be a noticeable rise over the decade.

These figures are illustrative. Actual premiums depend on your insurer, product, gender, health status, and smoker status.

When to Keep CPI Indexation On

For many New Zealanders, CPI indexation is a valuable feature that you should leave in place. Here are the situations where it makes the most sense.

You are young and your financial obligations are growing

If you are in your 20s, 30s, or early 40s, your income is likely still increasing and your financial commitments are expanding. Keeping CPI indexation on ensures your cover does not fall behind as the cost of living rises. The guaranteed insurability aspect is particularly valuable at this stage, because you may develop health conditions over time that would make it difficult or expensive to increase cover manually.

You have a young family

If you have dependent children, your family's living costs will increase with inflation. A $500,000 life insurance payout today will not stretch as far in 15 years when your children are still dependants. CPI indexation keeps the real value of your cover intact so that a payout would still meet its intended purpose.

You still have a large mortgage

If your mortgage is a significant part of why you hold life insurance, consider that while your mortgage balance gradually reduces, inflation affects everything else your cover needs to protect: living costs, education expenses, childcare, and your partner's ability to maintain the household. CPI indexation helps ensure the non-mortgage component of your cover remains adequate.

Your income protection benefit needs to keep pace

Income protection is designed to replace your income if you cannot work. If your benefit amount stays flat while wages and living costs rise, the gap between what you earn and what your policy pays out grows each year. CPI indexation on income protection is particularly important for people early in their careers.

When to Consider Turning CPI Indexation Off

There are legitimate reasons to switch off the automatic increases. The key is making a conscious, informed decision rather than simply accepting the default.

You are approaching retirement

If you are in your late 50s or 60s and planning to wind down your insurance cover, automatic increases add cost for cover you may not need for much longer. At this stage, your children are likely financially independent, your mortgage may be paid off or nearly so, and your KiwiSaver and other savings are building. Adding more cover each year may not align with your reducing need.

Your cover is already more than adequate

If you reviewed your insurance recently and your sum insured already exceeds what your family would need, there is no point paying extra for automatic increases. This sometimes happens when people receive an inheritance, pay off debts, or when their partner starts earning significantly more.

You are actively cutting costs

If your household budget is under pressure and you need to reduce your insurance premiums, turning off CPI indexation is one of the least harmful ways to lower costs. You keep your existing cover amount intact but simply stop it from growing. This is a better option than cancelling cover entirely or reducing your sum insured below what you actually need.

You prefer to manage increases manually

Some people prefer to review their insurance annually and decide for themselves whether to increase cover. This gives you more control over the timing and size of any adjustments. The trade-off is that any manual increase will require underwriting, which could be a problem if your health has changed.

How to Opt Out of CPI Indexation

Turning off CPI indexation is straightforward. You have several options:

  1. Contact your adviser. If you set up your insurance through an authorised financial adviser, they can arrange the change with your insurer. This is the simplest approach and your adviser can also confirm whether opting out makes sense for your overall cover strategy.

  2. Contact your insurer directly. Call or email your insurance company and request that CPI indexation be removed from your policy. They will confirm the change in writing.

  3. Decline the annual increase. Most insurers send you a notice before your policy anniversary confirming the upcoming CPI adjustment. You can decline the increase for that year without permanently turning off indexation. This gives you flexibility to accept increases in some years and decline them in others.

If you turn off indexation and later want to turn it back on, most insurers will allow this, but any increase in cover at that point will typically require fresh medical underwriting. This is an important consideration, especially if your health has changed since you first took out the policy.

Get a free insurance review. Not sure whether CPI indexation is right for your current situation? Request a free review from a QuoteHub adviser and get a personalised recommendation based on your age, debts, dependants, and goals.

The Alternative: Manual Cover Reviews and Increases

If you turn off CPI indexation, you should not simply set and forget your cover amount. The responsible alternative is to conduct a regular manual review.

A good approach is to review your insurance at least once a year. During that review, ask yourself:

If you decide you need more cover, you can apply for an increase. Be aware that this will involve underwriting. The insurer will ask about your current health, any new medical conditions, medications, and lifestyle factors. If something has changed, they may apply exclusions, loadings, or decline the increase altogether.

This is the fundamental trade-off. CPI indexation gives you guaranteed increases without underwriting. Manual increases give you control but come with the risk that you may not qualify for additional cover when you need it.

How Different NZ Insurers Handle CPI Indexation

Not all insurers apply CPI indexation in exactly the same way. Here are some of the key differences you may encounter.

CPI measure used

Most NZ insurers use the annual change in the All Groups CPI as published by Stats NZ. Some may use a different measure or a smoothed average. Check your policy wording to confirm which index applies to your cover.

Minimum and maximum adjustment

Some insurers apply a minimum annual increase (for example, 2%) even if the actual CPI is lower. Others cap the maximum increase at a certain percentage (for example, 10%) to prevent large jumps in high-inflation years. A small number of insurers will not reduce your cover if the CPI is negative (deflation), meaning your sum insured can only go up or stay the same.

Opt-out rules

Most insurers allow you to decline the CPI increase each year. However, some have rules about consecutive opt-outs. For example, if you decline the increase for two or three consecutive years, some insurers will permanently remove the indexation feature from your policy. You would not be able to turn it back on without underwriting.

Income protection specifics

For income protection policies, CPI indexation typically applies to the monthly benefit amount. Some insurers also adjust the waiting period benefit or the amount payable during a claim. It is worth checking the specific terms for your policy.

Level premium interaction

If you are on level premiums, the CPI increase means your premium does go up each year, even though you have a "level" premium structure. The level component refers to the age-based rate staying constant. The sum insured increase from CPI indexation is an additional layer on top. This catches some people off guard, as they expect level premiums to remain completely flat.

CPI Indexation and Claim Payouts

One scenario that highlights the value of CPI indexation is when a claim occurs many years after the policy was taken out.

Consider someone who took out $400,000 of life insurance in 2010. Without CPI indexation, a claim in 2026 would pay out $400,000. With CPI indexation at an average of 2.5% per year over 16 years, the sum insured would have grown to approximately $593,000. That additional $193,000 could make a meaningful difference to the surviving family.

The same logic applies to trauma and income protection claims. A trauma payout that was calibrated to cover mortgage payments and living costs in 2015 may fall short in 2026 if it has not been adjusted for inflation.

A Practical Decision Framework

To decide whether CPI indexation is right for you, work through these questions:

  1. Is your current sum insured adequate? If it is already more than you need, automatic increases add unnecessary cost.
  2. Are you likely to need cover for more than 10 years? If yes, CPI indexation helps maintain the real value of your cover over the long term.
  3. Could you pass medical underwriting today? If your health has deteriorated since you took out the policy, the guaranteed insurability of CPI indexation is extremely valuable. Do not give it up lightly.
  4. Is premium affordability a concern right now? If you are under financial pressure, declining the CPI increase for a year or two is a reasonable short-term measure.
  5. Do you have an adviser who reviews your cover regularly? If you have a structured annual review process, manual increases may work well. If you are likely to set and forget, CPI indexation provides a useful safety net.

Talk to a QuoteHub adviser. Whether you want to keep, adjust, or remove CPI indexation from your policies, get in touch for a free no-obligation review. We will help you make sure your cover matches your current needs.

Frequently Asked Questions

What does CPI indexation mean on my insurance policy?

CPI indexation means your sum insured automatically increases each year in line with inflation, as measured by the Consumer Price Index. The increase happens without you needing to provide any medical information or go through underwriting. Your premium also increases to reflect the higher cover amount.

Can I turn off CPI indexation?

Yes. You can ask your insurer or adviser to remove CPI indexation from your policy at any time. You can also decline the annual increase on a year-by-year basis without permanently removing the feature. Be aware that some insurers will remove indexation permanently if you decline increases for two or more consecutive years.

Does CPI indexation apply to all types of insurance?

CPI indexation is standard on most personal risk insurance products in New Zealand, including life insurance, trauma cover, TPD, and income protection. It does not typically apply to health insurance (which is priced differently) or general insurance such as car or contents cover, where sums insured are set based on asset values rather than a fixed dollar amount.

Will turning off CPI indexation reduce my premiums?

Turning off CPI indexation will not reduce your current premium. It will prevent your premium from increasing due to CPI-driven sum insured growth at your next policy anniversary. Your premium may still increase if you are on stepped premiums (due to age-based rate changes) or if your insurer applies a portfolio-wide rate adjustment.

Is CPI indexation the same as a premium increase?

No. CPI indexation is an increase in your sum insured (the amount you are covered for). This increase in cover causes a corresponding increase in your premium. A premium increase can also happen independently of CPI indexation, for example through age-based stepped premium increases or insurer rate reviews.

What happens if I decline CPI indexation and later want more cover?

If you decline CPI indexation and later decide you need a higher sum insured, you will need to apply for an increase through the standard underwriting process. This means answering medical questions and potentially undergoing health checks. If your health has changed, the insurer may decline the increase, apply exclusions, or add a premium loading.

Disclaimer: QuoteHub is operated by Kora Financial Services Limited (FSP 712931). The information in this article is general in nature and does not constitute personalised financial advice. Insurance products and CPI indexation terms vary between providers. We recommend speaking with an authorised financial adviser before making changes to your insurance cover. QuoteHub advisers can provide personalised guidance based on your individual circumstances.

References

Explore related pages: Life Insurance, Income Protection, Health Insurance, Trauma Insurance.