Indexation and CPI Increases on Income Protection in NZ (2026): Keeping Your Cover Worth Something

Every year your insurer offers a CPI increase to your income protection benefit. Here's what indexation does, what it costs, what happens if you keep declining it, and how to think about your next letter.

Once a year your insurer sends a letter offering to lift your income protection benefit by inflation. It looks like a small administrative nudge — a slightly higher benefit, a slightly higher premium — and a lot of people decline it to keep their costs flat. That is a reasonable instinct in any given year. The problem is what happens when the same instinct repeats for five or ten years in a row, because the benefit you insured slowly stops matching the income it was meant to replace.

This guide explains what benefit indexation does, why the letter arrives every year, what it costs, and how to think about whether to accept your next one.

TL;DR: Indexation lifts your income protection benefit each year in line with inflation, so it keeps pace with rising prices. NZ annual CPI inflation was 2.5% in the year to March 2025 ¹. Accept it and both your benefit and premium rise; decline it repeatedly and a fixed benefit quietly loses real value — by roughly a quarter over a decade at that rate.

What is benefit indexation on income protection?

Benefit indexation is a feature that automatically increases your insured monthly benefit each year, usually in line with the Consumers Price Index (CPI) — the official measure of how much prices have risen ¹. Some insurers index by a fixed percentage instead, or by CPI capped at a set figure, so the exact mechanism is set out in your policy wording.

The point of it is simple. Income protection is meant to replace a slice of your income if illness or injury stops you working. But the cost of living keeps moving, and so does the income you are trying to protect. If your benefit is frozen at the figure you chose years ago, it gradually covers less and less of your real expenses. Indexation is the mechanism that keeps the benefit roughly in step with prices over time.

Accepting the increase usually does not require new health questions or underwriting — the uplift is built into the contract, so you keep it even if your health has changed since you took the policy out. That is one of the quietly valuable parts of the feature: it lets your cover grow without having to re-prove your insurability.

Why do you get a CPI increase letter every year?

The letter arrives because most income protection policies in New Zealand have indexation switched on by default, and the insurer is required to offer you the increase rather than apply it silently. Each year, usually around your policy anniversary, they calculate the inflation adjustment, show you the new benefit and the new premium, and give you the option to accept or decline.

The figure they use is normally the most recent annual CPI movement published by Stats NZ. Annual inflation was 2.5% in the year to March 2025, up from 2.2% in the year to December 2024 ¹². So a letter sent off the back of those figures might offer to lift your benefit by around that amount, with the premium rising broadly in proportion.

Declining is easy and there is no penalty for doing it in a single year. But many policies have a rule about repeated declines, which is where the feature can quietly switch off — covered further down.

What happens to your benefit during a long claim with indexation?

There are two distinct moments where indexation can apply, and policies differ on both:

• Before you claim — the annual uplift keeps your insured benefit growing while you are healthy and working, so the cover you would receive keeps pace with your income.
• During a claim — some policies also index the benefit while it is being paid, so a long claim does not leave you on a frozen monthly amount as prices keep rising around you. This in-claim indexation is sometimes called a claims escalation or benefit indexation benefit, and not every policy includes it.

The in-claim version matters most for the people who need income protection most: those with a long benefit period who could be off work for years. Prices rose 0.9% in the March 2025 quarter alone ³ — over a multi-year claim, that kind of quarterly drift compounds into a meaningful gap between a frozen benefit and the cost of living. Whether your policy escalates the benefit during a claim, and by how much, is set out in the wording, so it is worth checking rather than assuming.

How much does accepting CPI increases add to your premium?

When you accept the increase, two things go up together: your benefit and your premium. The premium rises for two reasons — you are now insuring a larger benefit, and you are a year older, which most income protection premiums price in anyway.

The table below illustrates how a benefit and its rough indexed increase track over a few years at the recent inflation rate. It is an illustration based on the 2.5% annual figure ¹, not a quote — your actual premium depends on your age, occupation, policy type and insurer.

Illustrative indexed benefit at 2.5% a year

Illustrative only, using 2.5% annual CPI ¹. Premiums rise alongside the benefit and are not shown.

The honest trade-off is that accepting indexation every year does steadily increase what you pay — that is the cost people are trying to avoid when they decline. The question is whether the saving is worth the slow erosion of cover, which depends on how close your benefit already is to your real income.

What's the risk of declining indexation several years in a row?

Declining once is harmless. Declining repeatedly carries two risks.

The first is the obvious one: your benefit stays frozen while prices keep climbing, so it covers less of your real costs each year. The second is less obvious and catches people out. Many policies have a clause stating that if you decline the indexation offer a set number of years in a row — often two or three consecutive years — the insurer switches the indexation feature off for good. After that, future increases are no longer automatic, and adding cover back later may require fresh underwriting, which means new health questions you might not pass if your health has changed.

So the practical risk of declining several years running is not only that your benefit falls behind inflation, but that you can lose the ability to grow it automatically at all. If money is genuinely tight in a given year, declining once is fine — but it is worth knowing where your particular policy draws the line before you make it a habit.

How does inflation erode a fixed income protection benefit?

A benefit fixed in dollar terms loses real value whenever prices rise — which, over time, they almost always do. New Zealand's recent experience makes the point sharply. Annual inflation peaked at 7.3% in the June 2022 quarter, a 32-year high ⁶, before easing back to 2.5% by March 2025 ¹.

The figure below illustrates the gap that opens up between an indexed benefit and a flat one over a long claim.

Indexed vs fixed benefit over a long claim

``` Real value of benefit over 10 years (illustrative, at ~2.5% inflation)

100% |●━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━● Indexed benefit |●● | ●●● (rises with CPI, 90% | ●●● holds real value) | ●●●● | ●●●● 80% | ●●●●● | ●●●●●● ○ Fixed benefit | ●●●●●●●● (real value falls 78% | ●●●●○ ~22% over 10 yrs) +----+----+----+----+----+----+----+----+----+----+ 0 1 2 3 4 5 6 7 8 9 10 years ```

Illustrative only, using Stats NZ CPI <sup>16</sup>. Real results will differ.

At 2.5% a year, a fixed benefit loses roughly 22% of its real value over a decade — a $5,000 benefit would buy what about $3,900 buys today. If inflation runs hotter, as it did in 2022, the erosion is faster. Indexation is the feature designed to stop that drift; declining it permanently is, in effect, choosing to let it happen. This is the same quiet force that eats into retirement savings, which we cover in how inflation affects retirement savings in NZ.

For context, the Reserve Bank targets inflation of 1% to 3%, with a 2% midpoint <sup>4</sup>, and cut the Official Cash Rate to 3.50% in April 2025 as inflation settled back inside that band <sup>5</sup>. So 2–3% a year is a reasonable medium-term planning assumption — but it is an assumption, not a promise, and actual inflation will differ.

Does indexation interact with the 75% income cap?

Yes, and this is where indexation has a natural ceiling. Most NZ income protection policies cap the benefit at around 75% of your pre-disability income <sup>7</sup>. Indexation grows your insured benefit, but at claim time the insurer can still test that benefit against your actual income and the policy's percentage cap.

What this means in practice depends on which payout basis your policy is on:

• On an indemnity policy, your income is re-tested at claim time, so even an indexed benefit is measured against your real recent earnings and the 75% cap. If indexation has pushed your insured figure above 75% of your current income, you may be paying premiums on cover you cannot fully claim.
• On an agreed value policy, the benefit you locked in is generally what you are paid, so indexation more reliably translates into a larger payout — provided your income has broadly kept pace.

The takeaway is that indexation works best when your income is rising too. If your benefit indexes up year after year but your income stalls, you can end up over-insured relative to the cap. We explain the two bases in detail in agreed value vs indemnity income protection in NZ, and the related choice of wait period vs benefit period is worth reading alongside it.

Should you accept your next CPI increase?

There is no single right answer, because it depends on your benefit, your income and your budget. A few questions are usually more useful than a blanket rule:

• Has your income grown since you took the policy out? If so, accepting the increase helps your benefit keep pace — and may still leave you under the 75% cap <sup>7</sup>.
• Is your benefit already close to 75% of your income? If you are on indemnity and indexation would push you over the cap, the extra benefit may not be fully claimable, so the increase could be less useful <sup>7</sup>.
• Have you declined in recent years already? Check whether your policy switches indexation off after a set number of consecutive declines — losing the feature usually matters more than one year's premium saving.
• Is the premium genuinely unaffordable this year? Declining once is fine. The risk is in making it a permanent habit without realising the benefit is falling behind.

The most expensive mistake is treating the letter as junk mail for years on end, then discovering at claim time that the benefit no longer matches your life. Whether to accept it in any given year is exactly the kind of thing worth talking through against your actual numbers.

Frequently asked questions

What is a CPI increase on income protection? It is the annual offer from your insurer to lift your insured monthly benefit in line with inflation, usually the Consumers Price Index published by Stats NZ. Annual CPI inflation was 2.5% in the year to March 2025 <sup>1</sup>. Accepting it raises both your benefit and your premium; it normally requires no new health questions.

Do I have to accept the indexation increase every year? No — you can decline any single year with no penalty. But many policies switch the indexation feature off permanently if you decline a set number of years in a row, often two or three. After that, adding cover back may require fresh underwriting, so it is worth knowing your policy's rule before declining repeatedly.

Will accepting indexation make my premium go up a lot? Each year's increase is modest — broadly in line with inflation, so around 2.5% on the benefit at recent rates <sup>1</sup>, plus the usual age-related rise. The cost adds up over many years, which is the trade-off against letting a fixed benefit lose real value to inflation.

Does indexation also apply while I'm on claim? It depends on your policy. Some include in-claim or claims-escalation indexation that keeps a long-running benefit rising with prices; others freeze the benefit once a claim starts. With prices rising 0.9% in a single quarter <sup>3</sup>, the difference matters over a multi-year claim, so check your wording.

Can indexation push my benefit above what I can claim? Yes. Most policies cap the benefit at around 75% of income <sup>7</sup>. On an indemnity policy your income is re-tested at claim time, so if indexation lifts your insured figure above 75% of your current income, you may be paying for cover you cannot fully claim. On agreed value, the locked-in benefit is more likely to be paid in full.

How much does inflation erode a fixed benefit? At around 2.5% a year, a fixed benefit loses roughly 22% of its real value over a decade <sup>1</sup>. If inflation runs hotter — it hit 7.3% in 2022 <sup>6</sup> — the erosion is faster. Indexation is the feature designed to offset that drift.

This article is general information only and is not personalised financial advice. It does not take into account your particular financial situation, goals or needs. Before acting, consider whether it's right for you and seek advice tailored to your circumstances. Whether a claim is paid depends on the terms, conditions, exclusions, stand-down periods and underwriting of the specific policy, and on your disclosure — always read the policy wording. Projections and illustrations here are based on stated assumptions, are not predictions, and actual results will differ. Craig Smith Business Services Ltd (FSP712931), trading as Smiths Financial, holds a Class 2 licence issued by the Financial Markets Authority and is a member of the Financial Dispute Resolution Service (FDRS). Written by Henry Smith, Financial Adviser; reviewed by Craig Smith, Principal Adviser. Last reviewed 22 April 2025.