Start with spending, not a headline balance

A retirement balance has meaning only when it is connected to the life it needs to fund. Begin with the annual amount your household expects to spend after leaving work. Use today’s prices for groceries, housing, transport, insurance, health, travel and discretionary costs. The calculator then holds that spending power constant through inflation, instead of asking you to guess what the same basket might cost decades from now.

The two preset buttons use the ASFA Retirement Standard figures published for the March quarter of 2026: $55,923 a year for a comfortable single lifestyle and $78,566 for a comfortable couple. Those benchmarks assume retirement at age 67 and home ownership. They are reference points rather than personal budgets. Rent, mortgage payments, disability support, family commitments, regional travel and private health needs can move a household well away from a standard amount.

Build a household number from current transactions

A better target often starts with twelve months of bank and card transactions. Remove work-only costs that are likely to disappear, then add irregular retirement costs that a monthly snapshot misses. A replacement car, dental work, home maintenance and helping adult children can arrive in large lumps. If those items are not inside the annual target, keep a separate reserve outside this calculation rather than assuming a smooth withdrawal can absorb every shock.

The calculation joins two different phases

Before retirement, the current pool earns the return you enter and receives one contribution at the end of each model year. The contribution rises with inflation so the amount represents a constant effort in today’s dollars. At the retirement date, the projected nominal balance is divided by the accumulated inflation factor. That creates the projected pool in today’s dollars shown in the result panel.

The spending phase uses a real return, which is the investment return after allowing for inflation. It then calculates the present value of a fixed real annual withdrawal paid at the end of each retirement year. If the real return is zero, the required pool is simply annual spending multiplied by the number of years. Otherwise, the calculation uses the standard annuity present-value factor.

Example: the default 40-to-67 plan

With $250,000 already set aside, $15,000 a year added in today’s dollars, a 6% pre-retirement return and 2.5% inflation, the future dollar balance is much larger than the number displayed as “today’s dollars”. The lower displayed amount is intentional: it lets the user compare that projected buying power with a $55,923 spending target without mixing prices from different years. The same inflation assumption is used on both sides of the comparison.

Why the supported-income result can be more useful than the gap

A large dollar shortfall can feel abstract. The supported annual spending figure reverses the annuity calculation and asks what level of constant real withdrawals the projected pool could fund over the selected period. That does not promise a payment. It translates the projection into the same unit as the household budget, making it easier to decide whether to save more, retire later or revise a spending category.

Use the gap to test decisions you can control

The result table changes one lever at a time. Retiring one year later gives the existing pool another year to grow, adds another contribution and shortens the selected saving gap. Adding $5,000 a year increases the real contribution from now to retirement. Spending $5,000 less reduces the required retirement pool. These are mechanical comparisons; the most realistic change depends on health, employment, caring duties and the expenses that matter to the household.

Return assumptions deserve a range, not one confident number

Investment returns do not arrive smoothly. A 6% input is a long-run average used for the projection, not a promise that each year earns 6%. Poor returns close to retirement can hurt more because there is less time to recover and withdrawals may begin while markets are down. Recalculate with a lower return, a higher inflation rate and a shorter saving period. A plan that works only under the most optimistic combination has little margin for error.

Separate access age from the age you stop working

Money inside super is preserved until a condition of release is met. Stopping work earlier does not automatically make every super dollar available. If the plan includes a gap before super can be accessed, the current savings input should be split mentally into accessible investments and preserved super. This page combines them for a broad target comparison, so a separate cash-flow plan is needed for any bridge years.

Tax also depends on the source of retirement income. MoneySmart notes that for most people an income stream from a taxed super fund is tax-free from age 60, while other investment income can remain taxable. The spending input is after tax, but the projection does not calculate personal tax, contribution caps or pension minimum drawdown rules. Enter returns after the relevant taxes and fees where practical, and review the final structure with the fund or an adviser.

Age Pension and longevity need separate checks

The result deliberately excludes Age Pension payments. Services Australia applies both income and assets tests, and super can be treated differently before and after Age Pension age or when an account-based pension starts. Including a guessed pension amount would make the neat gap less reliable. Use the projection first to see what private savings can support, then test Age Pension eligibility with the official rules and add it as a separate income source.

The chosen retirement duration is also not a forecast of how long anyone will live. Twenty-five years from age 67 reaches age 92; a longer period may be sensible for a household with younger partners, strong family longevity or a preference for extra security. A fixed period ending at zero leaves no planned estate and no buffer beyond that date. Extending the years increases the required balance because the same real spending must be funded for longer.

Defined benefits, annuities and property require different treatment

A defined benefit pension produces an income based on scheme rules rather than an account balance, and a lifetime annuity transfers some longevity risk to a provider. Rental property combines income, vacancies, maintenance, tax and an asset that may be sold. Convert reliable net income from those sources into a reduction in the annual spending that the investment pool must fund, or model them separately. Do not simply add a property valuation to liquid savings while also counting its full rental income.

Review the plan after major changes rather than watching the result daily. A new salary, changed contribution rate, updated fund fee, property decision, retirement date or persistent shift in spending justifies a fresh calculation. Market movements alone can make the estimated gap noisy. The most useful comparison keeps assumptions consistent and records why a change was made.