Total vs Partial Disability in Income Protection NZ (2026): How Returning to Work Part-Time Pays

Total disability cover only pays when you cannot work at all. Partial (proportionate) cover pays when you ease back part-time — here is how it is calculated and why it matters.

Most people think of income protection as an all-or-nothing benefit: you are either off work and being paid, or back at work and not. In practice, recovery is rarely that clean. Many people return part-time first — a few days a week, lighter duties, reduced hours — before they are back to full capacity. The part of your policy that decides whether you keep getting paid during that phase is the partial disability benefit, and it is one of the most useful and most overlooked features in the wording.

This guide explains the difference between total and partial disability, how a proportionate benefit is worked out, and how it interacts with ACC and offset clauses.

TL;DR: Total disability cover pays when you cannot work; partial (proportionate) cover pays a scaled benefit when you return part-time and earn less than before. New Zealand income protection typically replaces up to about 75% of gross income for total disability ³, and a partial benefit reduces that in proportion to the income you have lost. ACC works the same way for injury, abating weekly compensation as you earn on a graded return ⁵.

What is the difference between total and partial disability?

The two terms describe two different states, and a good policy covers both.

Total disability is the state where you cannot work — usually defined as being unable to perform the important duties of your occupation (or, on weaker wordings, any occupation), and not working in any capacity for income. When you meet the total disability definition and have served your waiting period, the policy pays its full monthly benefit, up to the agreed limit.

Partial disability is the in-between state. You can do some work — fewer hours, reduced duties, or a lighter role — but you are still earning less than you did before because of the same illness or injury. A partial (or "proportionate") benefit tops up part of that lost income so that easing back to work does not mean losing all your cover at once.

The distinction matters because most recoveries pass through the partial stage. Someone recovering from cancer treatment, a back injury, or a serious mental-health episode often cannot jump straight from "off work entirely" to "back full-time." A policy with a genuine partial disability benefit keeps paying through that transition; a policy without one can leave you facing a choice between staying fully off work to keep the benefit, or returning too early and losing it.

How does a partial (proportionate) benefit get calculated?

The principle is simple: the benefit scales with how much income you have lost, not how many hours you work. Most NZ wordings follow a version of this formula.

Partial benefit = (pre-disability income − income while partially disabled) ÷ pre-disability income × total disability benefit

In plain terms, the insurer looks at the proportion of your income you have lost, then pays that same proportion of your full monthly benefit. If you have lost half your income, you receive roughly half the total benefit. As your earnings recover, the benefit tapers down, reaching nil when you are back to your pre-disability income.

Here is how that looks across a recovery, assuming a total disability benefit of 75% of a $100,000 income (i.e. a maximum benefit of $75,000 a year, or $6,250 a month).

Partial disability benefit as income returns (illustrative)

Illustration only, based on common insurer PDS norms ³⁶; actual definitions, percentages and caps vary by policy. Returns and benefits are not guaranteed.

A few details change the exact figures. Some policies require you to be totally disabled for a minimum period (often the waiting period, or part of it) before the partial benefit becomes available. Many cap the total of your partial benefit plus your earnings so the combined amount does not exceed 100% of your pre-disability income. And how "income while partially disabled" is measured — actual earnings, or earning capacity — varies between wordings. These are the kinds of details worth checking before you need them.

Why partial disability cover helps you return to work safely

Without a partial benefit, income protection can accidentally discourage the very thing that aids recovery: a gradual return to work.

Consider the alternative. On a policy that only pays for total disability, the moment you start earning any income, the benefit can stop entirely. That creates an awkward incentive — going back two days a week might cost you the whole benefit while only replacing a fraction of your pay. Some people, understandably, stay fully off work longer than they need to, because returning part-time would leave them worse off financially.

A partial disability benefit removes that trap. Because it tops up the income you have not yet recovered, you can return part-time without losing the support you still need. Your total income — part-time earnings plus the partial benefit — stays closer to your pre-disability level while you build back up. Rehabilitation specialists generally regard a graded return as good for recovery, and ACC is built around the same idea: it actively supports a staged return to work and abates compensation as your earnings rise, rather than cutting it off the day you do any work ⁵.

For many people, the partial benefit is the part of the policy that actually gets used. Total, permanent inability to work is the dramatic scenario, but partial recovery is the common one.

How do insurer definitions of disability differ?

This is where the wording does the heavy lifting, and where two policies that look similar on price can behave very differently at claim time. The FMA's consumer guidance specifically directs people to read the policy wording or product disclosure statement, because the definitions of disability determine when and how much a claim pays ⁴.

Key points of variation to look for:

• Total disability trigger — whether it is based on your occupation (own or any) or on your inability to earn. Some policies treat a drop in income below a set percentage as total disability; others focus on your ability to perform duties.
• Partial disability availability — whether a proportionate benefit exists at all, and whether you must first be totally disabled for a set period to qualify.
• Income measurement — actual earnings versus earning capacity, and whether business expenses or sick-leave top-ups are counted.
• Caps and offsets — how partial benefits combine with ACC, other insurance and your own earnings (covered below).
• Indemnity versus agreed value — indemnity policies usually replace up to 75% of gross income and verify your income at claim time; agreed-value policies fix the benefit up front, often around 62.5% of gross income, with less income verification at claim ³.

Because these differ by policy and benefit type ⁴, two people with the "same" cover can get very different outcomes. Comparing wordings — not just premiums — is the part most people benefit from having an adviser do. See our guide on agreed value vs indemnity income protection for how that one choice flows through to what you can claim.

What is the 'own occupation' vs 'any occupation' definition?

This is the single biggest definition in any income protection or disability policy, and it shapes both total and partial claims.

Own occupation means you are assessed against your own job. If illness or injury stops you doing the important duties of your specific occupation, you can claim — even if you could theoretically do some other kind of work. For a surgeon who can no longer operate, or a builder who can no longer lift, this is the stronger, more valuable definition.

Any occupation means you are assessed against any job you could reasonably do given your training, education and experience. Under this definition, if you could do some other suitable role, you may not be considered totally disabled — even if you cannot return to your previous career. It is generally a tougher test to meet, and policies using it tend to cost less.

The same logic flows into partial claims. Under an own-occupation wording, a partial benefit is assessed against your ability to do your own role part-time. Under any-occupation, it is assessed more broadly, which can reduce or remove what you can claim. Neither is "right" for everyone — it depends on your occupation, your income, and how much certainty you want at claim time. The trade-off between a stronger definition and a lower premium is a common thing to weigh up with an adviser.

How does partial disability interact with offsets and ACC?

Partial benefits and offsets are closely linked, because both deal with the same question: how much other income are you receiving while disabled?

For injury, ACC is the first port of call. ACC pays weekly compensation of up to 80% of your pre-injury gross weekly earnings while you cannot work because of a covered injury ¹. As you return to work part-time, ACC abates (reduces) that compensation based on what you earn, so that your earnings plus compensation do not exceed your pre-injury entitlement ⁵. That is the same proportionate logic a private partial benefit uses — which is exactly why offsets exist.

ACC also has floors and ceilings. For the rate period 1 April 2024 to 31 March 2025, weekly compensation ran from a minimum full-time rate of $740.80 gross a week to a maximum of $2,350.62 gross a week ². Earnings above the maximum cap — roughly $152,790 a year of insurable earnings — are not covered by ACC ², which is one reason higher earners hold private income protection to fill the gap, including for the partial-disability phase.

Most private income protection policies are written to integrate with ACC for injury: the policy tops up the difference between ACC's payment and your insured benefit, rather than paying on top of it. So for an injury, ACC and your policy together aim to reach your insured percentage, and both abate as you earn more on a graded return. For illness, ACC pays nothing ¹, so your private cover — total or partial — does the whole job.

Offsets are not a catch — they are what keeps total replacement at a sensible level (you cannot generally end up better off disabled than working). But they do mean stacking policies rarely doubles your payout. Our guide to offset clauses, ACC and other income walks through how these interact in a real claim.

What evidence supports a partial disability claim?

Because a partial benefit is calculated from lost income, the claim is essentially an income-evidence exercise. Insurers generally want to see:

• Medical evidence that your reduced capacity is caused by the same illness or injury — usually a treating doctor's certification of your restrictions and a return-to-work plan.
• Pre-disability income — typically your earnings before you became disabled (commonly an average of recent months or years), used as the baseline. Agreed-value policies fix this up front; indemnity policies verify it at claim ³.
• Current income while partially disabled — payslips, drawings, or accounts showing what you are now earning, so the insurer can calculate the proportion lost.
• Ongoing review — partial claims are often reviewed periodically as your earnings change, with the benefit recalculated each period.

For employees, the income evidence is usually straightforward. For the self-employed and contractors, it can be more involved, because income is measured net of business expenses and can be lumpy month to month. Keeping clean records makes a partial claim far smoother. This is also where agreed-value cover can help self-employed people, since the benefit is fixed at the outset.

How do you make sure your policy has strong partial cover?

A few practical things separate a strong partial-disability policy from a weak one. None of these are advice about what you should buy — they are simply the features worth checking.

01. Confirm a partial (proportionate) benefit exists. Not every policy includes one, and some only pay partial benefits after a period of total disability. Check whether it applies from day one of the waiting period.

02. Check the total-disability definition. Own-occupation is generally stronger than any-occupation, especially for skilled or specialised roles — but it usually costs more.

03. Understand the income measurement. Look at how pre-disability income and current income are defined, and whether indemnity or agreed value suits your situation (employees vs self-employed differ here).

04. Map the offsets. Know how the policy integrates with ACC for injury and how it treats other income, so there are no surprises about what actually lands.

05. Check the benefit and waiting periods. A long benefit period (to age 65) matters most for serious claims; partial benefits usually continue within that same period as you recover.

06. Read the wording, or have someone read it for you. The differences that matter are in the definitions, not the headline percentage ⁴. Comparing wordings across insurers is the core of the work an adviser does.

Book a free review to check whether your current policy pays a partial benefit, and how it would work if you returned to work part-time.

Frequently asked questions

What is the difference between total and partial disability in income protection? Total disability is when you cannot work and meet the policy's disability definition, in which case the full monthly benefit is payable. Partial (proportionate) disability is when you can work some hours or lighter duties but earn less than before because of the same illness or injury — the policy then pays a scaled benefit based on the income you have lost ³⁴.

How is a partial disability benefit calculated in NZ? Most policies use a proportion of income lost: pre-disability income minus your income while partially disabled, divided by pre-disability income, multiplied by the full total-disability benefit. If you have lost half your income, you generally receive about half the benefit. Many policies also cap your earnings plus benefit at 100% of pre-disability income ³.

Does ACC pay a partial benefit if I return to work part-time? For a covered injury, yes — ACC supports a graded return to work and abates (reduces) weekly compensation based on what you earn, so your earnings plus compensation do not exceed your pre-injury entitlement of up to 80% of pre-injury earnings ¹⁵. ACC does not cover illness, so for illness a private partial benefit does the whole job ¹.

What is own occupation vs any occupation cover? Own occupation assesses you against the duties of your specific job, so you can claim if you cannot do your own role even if you could do other work. Any occupation assesses you against any job you could reasonably do given your training and experience, which is a tougher test to meet. Own-occupation wordings are generally stronger but usually cost more ⁴.

Will a partial benefit reduce as I earn more? Yes. A proportionate benefit tapers as your income recovers, reaching nil when you are back to your pre-disability income. This is by design — it keeps your total income closer to normal during recovery while not paying you more than you earned before ³⁵.

How much income does NZ income protection replace? New Zealand income protection typically replaces up to about 75% of gross income for total disability on an indemnity policy, and often around 62.5% on an agreed-value policy ³. A partial benefit scales down from that total-disability figure in proportion to the income you have lost. Returns and benefits are subject to the policy terms and are not guaranteed.

General information, not personalised financial advice. Seek advice tailored to your situation before acting. 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. 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 7 January 2025.