Saving was the easy part. Turning a KiwiSaver balance into income that lasts is harder. Here are the NZ drawdown strategies, safe withdrawal rates and the sequence risk that can sink an early retirement.
Since KiwiSaver launched in 2007, the conversation has been about one thing: putting money in. Contribute enough to get the full government contribution, pick a growth fund, leave it alone, let compounding do the work. That phase is called accumulation, and the rules of thumb are simple.
Then you hit 65, the contributions stop, and the question flips completely. Now you have a lump sum and you need it to produce a wage for the rest of your life, through good markets and bad, without running out. That phase is called decumulation, and almost nobody has been taught how to do it.
This guide explains, in plain New Zealand terms, how to turn a KiwiSaver balance into reliable retirement income: the drawdown strategies that work here, what a sustainable withdrawal rate actually is, and the one risk that can wreck an early-retirement plan in the first five years.
TL;DR: Decumulation is the process of drawing your KiwiSaver down for income in retirement 1. For most Kiwis a fixed-percentage withdrawal of 3.5%-4.5% each year is historically robust, sitting on top of NZ Super 5. The challenge is sequencing your withdrawals so a bad early run of returns does not permanently shrink the balance.
What is decumulation, and why does it matter at 65?
Te Ara Ahunga Ora, the Retirement Commission, defines decumulation as "the process of drawing down savings accumulated over the working life to provide income in retirement" 1. The Commission has been blunt that New Zealanders have plenty of guidance on saving and almost none on spending, and that we need better rules of thumb for running KiwiSaver down 1.
Here is why it matters more now than ever. NZ Super (the M-code, after-tax rate from 1 April 2026) pays a single person living alone $1,110.30 per fortnight, or about $28,867.80 a year. A qualifying couple receives $1,708.16 combined per fortnight, or about $44,412 a year 3. That is the floor under everyone's retirement, and it is paid regardless of how much you have saved.
But Super alone does not fund the lifestyle most people picture. Massey University's 2025 Retirement Expenditure Guidelines put a two-person "Choices" budget in a main centre at $1,739.85 a week and even a "No Frills" metro budget at about $910 a week 6. To fund the Choices lifestyle on top of Super, Massey estimates a couple needs a lump sum a little over $1 million 6. KiwiSaver is the engine that fills that gap, and decumulation is how you turn it into a fortnightly income.
The good news: the runway is longer than it used to be. NZ commentary on the actuaries' work notes that NZ Super plus KiwiSaver now typically has to fund close to two decades of retirement (eligibility at 65, life expectancy around 83), versus roughly 13 years for earlier generations 5. More years is the whole point, but it also means your money has to stretch further.
Does your KiwiSaver fund change when you retire?
No. This is one of the most common misunderstandings about KiwiSaver at retirement.
You can stay invested and draw down
Nothing forces you to cash out your KiwiSaver at 65. Once you reach the age of eligibility for NZ Super, the account simply unlocks: you can withdraw lump sums, set up regular payments, leave it invested, or do all three. Most major providers (Milford, Simplicity, Generate, Booster, Fisher Funds, ANZ) let you set a scheduled regular withdrawal straight to your bank account, so your KiwiSaver effectively pays you a "salary" that lands beside your NZ Super; if your provider does not offer automated payments, you can replicate the same effect with periodic manual withdrawals.
What does change is the job your fund has to do. In accumulation, volatility works in your favour, because you keep buying at lower prices. In decumulation, you are selling units to fund withdrawals, so a market fall while you are drawing down does lasting damage. That is sequence-of-returns risk, covered below. The answer is rarely to abandon growth entirely; it is to structure how and when you draw. Switching to a conservative fund just before retirement can lock in low returns across a retirement that may last two decades.
What are the main KiwiSaver drawdown strategies?
There is no single "right" way to draw a balance down. There are several recognised strategies, each with a different trade-off between income certainty and the risk of running out. The figure below compares the main approaches.
Figure: KiwiSaver drawdown strategies compared: benefits and risks (based on the NZ Shareholders Association decumulation framework 5).
| Strategy | How it works | Main benefit | Main risk |
|---|---|---|---|
| Fixed dollar | Draw the same dollar amount each year (e.g. $30,000 p.a.) | Predictable, easy to budget | No inflation adjustment; can drain a falling balance fast |
| Fixed percentage | Draw a set % of the current balance each year (e.g. 4%) | Self-correcting; you can never fully run out | Income wobbles year to year with markets |
| Dynamic percentage | Adjust the % up or down with portfolio value and age | Balances longevity and spending flexibility | Requires annual review and discipline |
| Total-returns | Spend only income plus realised gains, keep capital intact | Protects the capital base | Income can be lumpy; may underspend |
| Bucket | Hold 1-3 years' spending in cash/bonds, the rest in growth | Lets you avoid selling growth assets in a downturn | More accounts to manage and rebalance |
| Housing equity release | Draw on home equity (downsize or reverse mortgage) to supplement | Unlocks a large illiquid asset | Costs, compounding interest, reduces estate |
| Planned spend-down | Deliberately run the balance to near-zero by a set age | Maximises lifestyle while alive | Risk of outliving the plan if you live longer |
The two most-used in practice are fixed percentage (simple and self-correcting) and the bucket approach (best defence against sequence risk). A common hybrid combines the two: a bucket structure for the cash buffer, with a fixed-percentage rule governing how much you draw each year.
What's a sustainable withdrawal rate in NZ?
This is where New Zealand finally has its own numbers, rather than borrowing the American "4% rule".
The NZ Society of Actuaries' Retirement Income Interest Group (RIIG) published four revised rules of thumb specifically for Kiwis drawing down savings 4:
| Rule of thumb | How you calculate it | Best for |
|---|---|---|
| 6% Rule | Draw 6% of your starting balance each year | Simplicity; a higher, steadier income |
| Inflated 4% Rule | Draw 4% of starting balance in year one, then increase the dollar amount by inflation each year | Preserving purchasing power |
| Fixed Date Rule | Balance divided by the years to a chosen end date | Bridging to a known date (e.g. age 90) |
| Life Expectancy Rule | Balance divided by years to an actuarially estimated death age | Adjusting the draw as you age |
Separately, NZ analysis built on the actuaries' work finds that fixed-percentage withdrawals are historically robust in a 3.5%-4.5% range once you account for NZ Super sitting underneath 5. In practice the answer sits somewhere between 3.5% and 6%, depending on how much you want to leave behind, how long you expect to live, and how much volatility you can tolerate.
A worked example: the 4% vs 6% choice
Scenario: Margaret retires at 65 with a $400,000 KiwiSaver balance, alongside her single-person NZ Super of about $28,868 a year 3.
| Inflated 4% Rule | 6% Rule | |
|---|---|---|
| Year-one KiwiSaver draw | $16,000 | $24,000 |
| Plus NZ Super (single) | $28,868 | $28,868 |
| Total year-one income | $44,868 | $52,868 |
| Annual adjustment | Increases with inflation | Recalculated as 6% of balance |
| Risk profile | Lower draw, more left over | Higher income, faster depletion |
The 6% rule gives Margaret roughly $8,000 a year more to live on, which matters a great deal in her active early-retirement years. The trade-off is a thinner buffer if she lives to 95 or markets disappoint. There is no universally correct answer; the right rate is the one stress-tested against her longevity, her health, and whether leaving an inheritance is a goal. Sorted's Retirement Navigator is a free way to model how long savings last under different draws 7, and an adviser can model the same scenarios with you in a KiwiSaver review.
How sequence-of-returns risk can wreck an early-retirement drawdown
Two retirees can earn the exact same average return over 25 years and end up in completely different places, purely because of the order in which those returns arrived. That is sequence-of-returns risk, and it is the most under-appreciated danger in decumulation.
The reason is simple. While you are saving, a crash early on is harmless or even helpful, because you keep buying cheap units. But once you are drawing down, every withdrawal during a downturn locks in losses by selling units at depressed prices. If a 65-year-old hits a bad market in their first three or four retirement years while pulling 5-6% out, the balance can be permanently impaired even if markets fully recover afterwards. The pot never gets to ride the rebound on its original size.
The two practical defences are:
- A cash/bond buffer (the bucket approach). Hold one to three years of withdrawals in a conservative or cash fund so that, in a downturn, you spend from the buffer and leave your growth assets untouched until they recover. Kernel's dated NZ Bond funds (with March 2027 and March 2029 maturities) and the conservative options at Simplicity and Booster are the kinds of low-risk holdings retirees use for this buffer.
- A flexible withdrawal rule. Trimming your draw modestly in a bad year (which a fixed-percentage strategy does automatically) dramatically improves how long the money lasts.
This is the main reason a structured KiwiSaver review is best done in the two years before retirement, not the week after. The buffer needs to be built while markets are calm.
Should you switch funds or stay growth-tilted after 65?
The instinct is to flee to conservative the moment you retire. For most people, that instinct is wrong, because a retirement now lasts close to 20 years 5 and conservative funds can struggle to outpace inflation over that span.
The fee-and-return picture for the main growth funds explains why staying partly growth-tilted still makes sense even in decumulation:
| Fund | Total annual fee | Reported return | Basis | As at |
|---|---|---|---|---|
| Kernel KiwiSaver High Growth | 0.25% p.a. 8 | 12.57% p.a. | 5-year index (backtested) 8 | 31 May 2026 |
| Milford KiwiSaver Active Growth | 1.05% p.a. 9 | 6.82% p.a. | 5-year avg (live fund) 9 | 31 Mar 2026 |
| Simplicity KiwiSaver Growth | 0.25% p.a. 10 | 6.01% p.a. | 5-year avg (live fund) 10 | 30 Apr 2026 |
Note on the basis column: these returns are not strictly like-for-like. Kernel's High Growth KiwiSaver fund is relatively new, so its 12.57% figure is a backtested index return rather than a live fund track record, whereas the Milford and Simplicity figures are live five-year fund averages after fees and tax. Compare the basis, not just the headline number, and note that a higher-fee active fund (Milford) can still earn its place through different risk and asset-mix choices.
A 0.25% fee on a passive growth fund versus a higher-fee active option compounds to real money over a 20-year retirement. But the headline return is only half the story for a retiree, the other half is volatility. The sensible structure for most over-65s is not all-growth or all-conservative; it is a split: a growth core that keeps the bulk of the money working for the long tail of retirement, plus a conservative or bond buffer (Kernel's dated NZ Bond funds, Simplicity's conservative option, or income funds from Booster and ANZ) to fund near-term withdrawals without selling growth units at a bad time.
There is no single "best fund", because the right fund depends on your fee tolerance, return needs and risk capacity. The practical step is to compare the numbers across providers in a KiwiSaver fund comparison. One more detail retirees forget: keep your PIR correct. Your taxable income usually drops in retirement, so many newly retired members fall from the 28% prescribed investor rate to 17.5% 2, which quietly lifts your after-tax return. A small number on very low income may qualify for 10.5%, but most retirees drawing meaningful KiwiSaver income alongside Super will sit at 17.5% rather than 10.5% (check the bands below).
| Taxable income | Combined income test | Your PIR |
|---|---|---|
| $15,600 or less | and combined $53,500 or less | 10.5% |
| $53,500 or less | and combined $78,100 or less | 17.5% |
| Above those bands | — | 28% |
PIR thresholds, Inland Revenue, effective 1 April 2025 2.
How a decumulation plan is built and reviewed annually
A drawdown plan is not a document you set once. It is a living calculation that changes with markets, your health, NZ Super adjustments and your spending. A sound process runs on an annual cycle:
1. Map the income floor. Start with your guaranteed NZ Super 3 and any other fixed income, then size the gap your KiwiSaver needs to fill against a real budget, using Massey's expenditure guidelines 6 as a sanity check.
2. Choose a withdrawal rule. Select from the actuaries' rules of thumb 4 and the 3.5%-4.5% robust range 5, stress-tested for your expected longevity.
3. Build the buffer. Set one to three years of withdrawals in a conservative or bond holding to neutralise sequence risk, with the rest staying growth-tilted.
4. Check the fund and the PIR. Compare fees and returns across providers 8910 and confirm you are on the correct prescribed investor rate 2.
5. Review every year. Rebalance the buffer, adjust the draw for markets and inflation, and update the plan as life changes.
If you are within a couple of years of 65, this is the work to do now. Run the numbers yourself first with the free KiwiSaver Health Check, then book a free KiwiSaver review to design the drawdown plan with an adviser.
Frequently asked questions
Do I have to take my KiwiSaver out at 65? No. At the age of NZ Super eligibility your KiwiSaver unlocks, but you can leave it fully invested, take lump sums, set up regular withdrawals, or any combination. Most people keep it invested and draw a regular income from it 1.
What is a safe withdrawal rate from KiwiSaver in NZ? NZ analysis based on the Society of Actuaries' work finds fixed-percentage withdrawals are historically robust in a 3.5%-4.5% range on top of NZ Super 5. The actuaries also offer a simpler 6% Rule (draw 6% of the starting balance each year) for a higher, steadier income 4. The right rate depends on your longevity, health and whether you want to leave money behind.
What is sequence-of-returns risk? It is the risk that a poor run of returns early in retirement does permanent damage, because you are selling units at low prices to fund withdrawals. Two retirees with the same average return can end up very differently depending on the order in which returns arrive. A cash/bond buffer and a flexible withdrawal rule are the main defences.
Should I switch to a conservative fund when I retire? Usually not entirely. A retirement now lasts close to 20 years 5, so an all-conservative fund risks losing to inflation. Most retirees do better with a growth core plus a conservative or bond buffer to fund the next one to three years of withdrawals. The right mix depends on your risk capacity, not a rule of thumb.
Do I need to change my PIR when I retire? Often, yes. Your taxable income usually falls in retirement, so you may drop from a 28% prescribed investor rate to 17.5% (or 10.5% if your income is very low) 2. Getting your PIR right lifts your after-tax return at no extra cost.
How does NZ Super fit with my KiwiSaver drawdown? NZ Super is your guaranteed income floor: about $28,868 a year for a single person living alone, or about $44,412 combined for a qualifying couple (M-code, after tax, from 1 April 2026) 3. Your KiwiSaver drawdown sits on top, filling the gap between Super and the lifestyle you want.
General information, not personalised financial advice. Seek advice tailored to your situation before acting. 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 16 June 2026.
Sources
- 1.Te Ara Ahunga Ora Retirement Commission — Decumulation (2026).
- 2.Inland Revenue — Find my prescribed investor rate (effective 1 April 2025).
- 3.Work and Income — Benefit rates from 1 April 2026 (NZ Super, M code).
- 4.NZ Society of Actuaries Retirement Income Interest Group (RIIG) — Drawdown rules of thumb (revised, 2024).
- 5.NZ Shareholders Association — The power of de-cumulation: KiwiSaver's second act (2025).
- 6.Massey University — 2025 New Zealand Retirement Expenditure Guidelines (via Financial Advice NZ, June 2025).
- 7.Sorted — How the Retirement Navigator works (2026).
- 8.Kernel Wealth — High Growth Fund (as at 31 May 2026).
- 9.Sorted Smart Investor — Milford KiwiSaver Active Growth Fund (as at 31 March 2026).
- 10.Sorted Smart Investor — Simplicity KiwiSaver Growth Fund (as at 30 April 2026).
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