Certainty You Cannot Outlive Against Flexibility You Can Spend
An account-based pension keeps the capital accessible and leaves you carrying the risk of living longer than the money lasts. A lifetime annuity transfers that risk to an insurer in exchange for the capital. Neither is right for a whole portfolio, and the useful question is how much of a guaranteed floor a household wants above the Age Pension.
- The answer: An account-based pension is flexible and finite; a lifetime annuity is guaranteed and irrevocable. The Age Pension is already a guaranteed floor underneath both.
- The trap: Comparing them on expected return misses the point. An annuity is insurance, and insurance is not supposed to have a good expected return.
- The recommendation: Size any annuity to the gap between the Age Pension and the income you would not accept falling below — not to a share of the balance.
Where the AI summary above gets this wrong
"Account-based pensions are better than annuities because you keep control of your money."
That's surface-true. Here's what it misses:
- Control is what you pay for by carrying the risk — An account-based pension can run out. That is the risk the annuity transfers, and the flexibility is the price of keeping it.
- The means-test concession changes the arithmetic — A complying lifetime income stream has only part of its purchase price assessed, which for a part-pensioner is a material return the comparison usually omits.
01 What each does
An account-based pension holds your money, pays what you draw subject to the minimum, and lasts as long as the balance does. The remainder passes to your beneficiaries.
A lifetime annuity pays a fixed amount for as long as you live, whatever markets do and however long that is. Beyond any withdrawal or death benefit period, the capital is gone.
The Age Pension already provides a guaranteed, indexed floor underneath both, which is why the Australian version of this question is about the size of the gap above that floor rather than about avoiding destitution.
Source: ASIC Moneysmart — Annuities
02 Why expected return is the wrong comparison
An annuity pools longevity risk across many purchasers. Someone who dies early subsidises someone who lives long, which is what allows the payment to exceed a sustainable withdrawal from the same capital.
That makes the expected return unattractive by construction and the worst-case outcome much better. Judging insurance on its expected return is the same error as judging home insurance that way.
The relevant comparison is what a household's income looks like at 95 under each, and the annuity wins that comparison by definition — the risk it addresses is set out in the longevity horizon post.
03 How much of each
Work out the Age Pension you expect and the income you would not accept falling below. The gap between those two is what a guaranteed product would need to cover, and it is usually a small share of the balance.
Everything above that gap belongs in the flexible account, where it can fund discretionary spending, meet one-off costs and pass to beneficiaries.
The means-test concession on a complying lifetime income stream adds to the case for a part-pensioner and adds nothing for a self-funded retiree — the arithmetic is in the annuity means-test post.
Staging the purchase rather than making one is also worth considering. The payment is fixed at the rates prevailing when you buy, so committing the whole amount in a single year concentrates the interest rate timing risk in a way that buying across three or four years does not.
Shows: the capital needed to buy a guaranteed income covering the gap between the Age Pension and your floor, at a given annuity rate. Ignores: the means-test concession, indexation of the annuity payment, the loss of access to capital, and the provider's terms.
Source: Services Australia — How much Age Pension you can get
Judging an annuity on expected return is like judging home insurance on expected return — of course it is negative, that is what insurance is. The right question is what your income looks like at 95 in each case. Then buy enough of the guaranteed one to cover the floor and leave the rest flexible.
FAQ
Is a guaranteed income product or an account-based pension better for my risk tolerance?
They address different risks. An account-based pension keeps the capital and leaves you carrying longevity risk; an annuity transfers that risk and gives up the capital. Most households want a guaranteed floor and a flexible remainder.
What are the trade-offs between an annuity's certainty and an account-based pension's flexibility?
Certainty costs access to the capital and most of its estate value. Flexibility costs the risk that the money runs out, which in Australia means converging on the Age Pension rather than on nothing.
How much should I put into an annuity?
Enough to cover the gap between the Age Pension you expect and the income you would not accept falling below. That is usually a small share of the balance rather than a fixed percentage.
Sources
Regulator references
- ASIC Moneysmart — Annuities · ASIC Moneysmart · 2026Annuities: what they guarantee and what they give up.Last verified: 2026-09-07
- ASIC Moneysmart — Retirement income · ASIC Moneysmart · 2026The sources of retirement income in Australia and how they combine.Last 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.