How Much Growth a Portfolio Still Needs Once You Stop Working
The instinct at retirement is to reduce risk, and it solves the wrong problem. The horizon does not end at the retirement date: a 65-year-old couple is investing for the life of the second of them, which is thirty years or more. Over that period the reliable destroyer of purchasing power is inflation, and a portfolio held entirely in cash has no defence against it.
- The answer: A retirement portfolio still needs meaningful growth exposure, because the horizon is measured in decades and inflation compounds against a fixed income.
- The trap: The risk that feels urgent is a market fall, and the risk that actually erodes a retirement is inflation. Only one of them appears on a statement.
- The recommendation: Split the portfolio by when you will spend it rather than by a single risk label. Near-term spending in cash, long-term spending in growth.
Where the AI summary above gets this wrong
"As you approach retirement you should move your superannuation into conservative or cash options."
That's surface-true. Here's what it misses:
- It treats the retirement date as the end of the horizon — A couple retiring at 65 is investing for the life of the survivor, which is commonly thirty years. Cash for thirty years loses substantial purchasing power with certainty.
- It ignores the Age Pension underneath the portfolio — A means-tested floor that rises as assets fall reduces the consequence of a market fall for most Australian households, which changes how much protection is worth buying.
- It confuses two different risks with different timescales — A market fall is fast, visible and recoverable. Inflation is slow, invisible on a statement, and not recoverable at all.
Take a couple who moved everything to cash three months before retiring — a composite of an extremely common reaction. They removed the risk of a bad first year and took on the risk of a thirty-year erosion, and only one of those two shows up on a statement.
01 The horizon does not end when work does
Planning to a retirement date treats the date as a finish line. It is a change in cash flow direction, not the end of the investment period, and the money still has to work for as long as either member of a couple is alive.
The ABS life tables put the expectation for someone who has already reached 65 well into the eighties, and the relevant figure for a couple is longer still because it is the second death that matters. Planning to the average means half the households in your situation outlive the plan.
That length is what makes an all-cash portfolio a decision rather than a neutral default. It converts an uncertain outcome into a certain slow loss, and the certainty is the part people mistake for safety.
The countervailing point is real: a fall in the first years of withdrawals does permanent damage, for the reasons set out in the sequence risk reference. Both risks are genuine, and they need different instruments.
02 Splitting by when you will spend it
The most useful framing is not a single risk score but a split by spending horizon. Money you will spend in the next one to three years does not belong in growth assets. Money you will spend in fifteen years does not belong in cash.
That produces a portfolio with a defensive layer sized to near-term spending and a growth layer sized to everything else, which is a different construction from a single balanced option and behaves differently in a downturn.
The defensive layer has a job: it removes the requirement to sell growth assets in a bad year. That is its entire purpose, and it is why the right size is a number of years of spending rather than a percentage of the portfolio.
The growth layer's job is to still be there, in real terms, in the 2050s. Judging it on this year's return is judging it against the wrong horizon, and it is the most common reason households abandon an allocation that was working.
03 What the Age Pension does to the decision
A means-tested pension that rises as assets fall is, in effect, a partial hedge against portfolio losses. It does not compensate fully and it does not apply above the cut-off, but for a part-pensioner it materially reduces the consequence of a bad market.
That argues for a household with a substantial pension entitlement being able to hold more growth exposure, not less, because the floor beneath the portfolio is higher. The arithmetic of the taper is in the assets taper reference.
For a self-funded retiree with no entitlement, the reverse holds: there is no floor, and the portfolio has to provide its own. That is the case where a defensive layer and a guaranteed income product do the most work.
It is commonly assumed that everyone approaching retirement should de-risk on the same schedule. It is not so — two households with the same balance and different pension entitlements are facing different problems.
Shows: what a portfolio held in cash is worth in today's money after a period of inflation, against the same money in a growth allocation. Ignores: sequence of returns, the Age Pension, tax, fees, and withdrawals — this compares purchasing power, not income.
04 The costs that decide the outcome
Fees come out of the return every year regardless of what markets do, and over thirty years the compounding is severe. The arithmetic is in the super fees post and it is the single most reliable improvement available to a portfolio.
The research on active management is consistent about direction if not magnitude: in aggregate, investors pay a substantial cost attempting to beat the market, and persistence in fund outperformance is largely explained by costs and momentum rather than by skill.
That is not an argument that active management never works. It is an argument that the fee is certain and the outperformance is not, which for a portfolio that has to last thirty years is the relevant asymmetry.
Costs inside super are also easier to compare than they used to be, because funds must publish a standardised figure. Comparing that figure across three funds takes minutes and is worth more than most allocation decisions.
05 What I would actually do
Size the defensive layer in years of spending — two to three years of the amount you draw, held in cash or very short fixed interest — and let the rest sit in growth assets.
Rebalance by spending rather than by selling. Draw the defensive layer down in a bad year and refill it from growth assets in a good one, which produces the sell-high behaviour automatically rather than requiring you to decide.
Ignore the single risk label your fund puts on an option. 'Balanced' means different things at different funds and frequently means a growth allocation above 70%, which may or may not be what you want but is certainly not what the word suggests.
And leave it alone between reviews. The allocation that fails is almost never the one that was slightly wrong; it is the one that was changed after a bad quarter and changed back after a good one.
The move to cash before retirement is the most expensive decision I see, and it never looks like a decision. It looks like prudence, it removes a risk you can feel, and it takes on a risk you cannot see until a decade has gone. If you want to reduce the fear, hold two years of spending in cash and leave the rest — that addresses the thing that actually frightens people, which is being forced to sell.
FAQ
How does asset allocation work in retirement?
Split the portfolio by when you will spend it rather than by a single risk label. Two to three years of spending in cash removes the need to sell in a bad year; the rest has a horizon measured in decades and needs growth exposure to outrun inflation.
Should I move my super to cash when I retire?
Not the whole of it. A couple retiring at 65 is investing for the life of the survivor, commonly thirty years, and cash held that long loses substantial purchasing power with certainty.
Should I invest in shares or bonds in retirement?
Both do different jobs. Shares provide the long-run growth that defends purchasing power; fixed interest and cash provide the stability that stops a bad year forcing a sale. The split follows from when you will spend the money.
Does the Age Pension change how much risk I can take?
Yes. A means-tested pension rises as assets fall, so a part-pensioner has a floor beneath the portfolio that a self-funded retiree does not. Two households with the same balance and different entitlements are facing different problems.
Sources
Regulator references
- ASIC Moneysmart — Choose your investments · ASIC Moneysmart · 2026Choosing investments: risk, diversification and time horizon.Last verified: 2026-09-07
- Australian Bureau of Statistics — Life expectancy · Australian Bureau of Statistics · 2026The ABS life expectancy series, used for the planning horizon.Last verified: 2026-09-07
- Reserve Bank of Australia — Inflation · Reserve Bank of Australia · 2026The Reserve Bank's inflation data and its target band.Last verified: 2026-09-07
- ASIC Moneysmart — Superannuation fees · ASIC Moneysmart · 2026The fees a super fund charges and how they compound against a balance.Last verified: 2026-09-07
Research
- On Persistence in Mutual Fund Performance · The Journal of Finance · 1997finds persistence in fund returns is explained by costs and momentum rather than by manager skillLast verified: 2026-09-07
Calculator unit tests · the assertions this page's worked example is checked against, and their last result
Changelog
- 2026-09-07 — initial publish (new format)
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Jordan Reeves
Founder of Talk Through Wealth. A software engineer for over a decade before turning to retirement planning, Jordan built the projection engine after watching family members get fragmented, country-by-country advice that never reconciled. He writes about retirement the way the engine computes it: month-by-month, lifetime-long, and skeptical of any rule of thumb that hasn't been run through the math.