How Much Do You Need to Retire?

"How much do I need to retire?" has no single answer — but there is a clear, sensible way to estimate your own number.

Plantrino Guides · Updated 2026 · About a 9-minute read

The retirement question worries almost everyone, partly because the figures quoted in headlines are so large and so varied. The truth is that there is no universal number — the right amount is deeply personal. But it can be estimated logically. This guide walks through how.

It Starts With Spending, Not a Headline Number

The most important shift in thinking is this: your retirement number is not driven by your income or by some standard figure. It is driven by how much you expect to spend each year in retirement.

Two people with identical careers can need very different amounts, simply because one expects a modest, quiet retirement and the other plans for travel and a fuller lifestyle. So the first step is not a calculator — it is an honest estimate of your annual retirement spending.

A practical way to build that estimate is to start from what you spend now and adjust. Some costs often fall away in retirement: commuting, work clothes, and — for many Australians — mortgage repayments, if the home is paid off by then. Other costs tend to rise, especially travel in the early years and health costs later on. Working through your current budget line by line, asking "will this still exist when I stop working?", produces a far more useful figure than any rule based on a percentage of salary.

From Annual Spending to a Target

Once you have an estimate of yearly spending, a widely used rule of thumb converts it into a target nest egg. It suggests aiming for roughly 25 times your expected annual spending:

So someone expecting to spend 50,000 a year might aim for a target around 1,250,000. The 25x figure comes from the idea of drawing down about 4% of a portfolio each year — since 100 ÷ 4 = 25. It is a starting estimate, not a precise promise.

Putting Real Numbers on It

Here is how the whole estimate fits together for one imaginary person — the figures are purely for illustration, not targets or advice. Sarah is 45 and, after going through her budget, expects to spend about $55,000 a year in retirement, with the mortgage paid off by then.

That number looks intimidating on its own — but Sarah does not have to save it all herself. Suppose her super fund's projection tool suggests her balance could reach around $900,000 by the time she retires, based on her current contributions. The gap between the target and her projected super is:

That gap is what her savings and investments outside super need to cover — and even that overstates the task, for two reasons. First, money she invests along the way grows too, so she does not need to deposit the full $475,000 out of her own pocket. Second, she may qualify for a full or part Age Pension later in retirement, which reduces how much her own money needs to provide. The headline figure shrinks quickly once you subtract everything already working in your favour.

Why It Is Only a Guideline

The 25x rule and the withdrawal rates behind it are rules of thumb based on historical data. Real retirements are affected by future investment returns, inflation, how long the retirement lasts, and how flexibly a person can adjust spending. A retirement that lasts thirty years faces different pressures than one of fifteen. Many people use the 25x figure as an anchor and then refine it — some prefer a more conservative withdrawal rate for added safety.

The general version of the rule makes the trade-off visible:

Purely as arithmetic: on $50,000 of annual spending, a 4% withdrawal rate implies a $1.25 million target, a 3.5% rate implies about $1.43 million (a multiple of roughly 28.6), and a 3% rate implies about $1.67 million (a multiple of 33.3). Nobody knows in advance which rate the future will justify — the point is that a small change in the assumed rate moves the target by hundreds of thousands of dollars, which is why the target is best treated as a range rather than a single line to cross.

You Are Not Building It All From Savings

An important comfort: the full target does not have to come from money you personally set aside. Several sources can contribute to retirement income:

• Superannuation or pension savings — often built steadily through your working life, partly via employer contributions.
• Personal investments and savings — anything you have invested outside super.
• Government support — many countries provide an age pension or similar, subject to eligibility.
• Other income — part-time work, rental income, or other sources some retirees choose.

Your personal saving task is the gap between your target and what these other sources are expected to provide — which is often smaller than the headline number suggests.

Where Super Does the Heavy Lifting

For most working Australians, superannuation is the engine of the retirement plan, and it runs whether you think about it or not. Employers currently pay 12% of ordinary earnings into super. On a salary of $85,000, that is $10,200 flowing into your retirement savings every year before you save a single extra dollar yourself — $255,000 of contributions over 25 years, before any investment growth is counted. With decades of compounding on top, the projected balance can be a large share of the whole target, which is exactly what Sarah's example above showed.

That is also why the Age Pension is best treated as a safety net in your planning rather than the plan itself. Eligibility depends on age, assets, and income tests that change over time — check Services Australia for the current rules — so a plan that works without it, and is simply strengthened if you qualify, is far more robust than one that relies on it.

What Changes the Answer

Several factors move your number up or down: when you plan to retire and therefore how long retirement lasts, whether you will still have a mortgage, your health and likely costs, the lifestyle you want, and inflation eroding the value of money over time. Because of all this, a retirement estimate is best revisited every few years rather than set once and forgotten.

Inflation deserves special mention because it works silently. Purely as an illustration: if prices rose 3% a year, a lifestyle costing $50,000 today would cost about $67,000 a year in ten years' time (50,000 × 1.03¹⁰ ≈ 67,200). The practical fix is simple: do your estimate in today's dollars, use a calculator that accounts for inflation when projecting, and redo the numbers every few years so the target keeps pace with reality.

Common Mistakes

Basing the target on income instead of spending. A high earner who lives modestly needs far less than their salary suggests; a moderate earner with expensive plans needs more. Spending is the driver — always start there.

Forgetting the mortgage. Whether your home will be paid off by retirement changes annual spending dramatically. A plan that assumes no housing cost, when repayments or rent will actually continue, understates the target by hundreds of thousands of dollars over a long retirement.

Ignoring inflation. A target set in today's dollars and never revisited quietly loses purchasing power every year. Revisit the estimate regularly and make sure any projection you rely on accounts for rising prices.

Treating the Age Pension as all-or-nothing. Some people assume they will get nothing and over-save under stress; others assume a full pension and under-save. Eligibility is means-tested and the rules shift — check Services Australia's current thresholds rather than guessing either way.

Doing the estimate once and filing it away. Careers change, markets move, and plans evolve. An estimate revisited every two or three years stays useful; one done at 35 and never touched again is history, not planning.

Leaving out late-retirement costs. Spending often falls in the middle years of retirement and then rises again with health and aged-care needs. Building some buffer for the later years is more realistic than assuming spending only ever declines.

Frequently Asked Questions

How much you need to retire flows from one honest estimate — your annual retirement spending — scaled up by a rule of thumb, then reduced by the income sources already working for you. The figure is personal and approximate, and that is fine. What matters most is estimating it early and revisiting it, so the future is something you have planned for rather than worried about.