How does a super growth calculator work?
A super growth calculator estimates your superannuation balance at a selected retirement age using your current savings, future contributions, assumed investment returns and account fees. The result is an illustration, not a guaranteed balance.
The model credits contributions monthly, converts the chosen effective annual investment return into a monthly rate and deducts modelled fees. Before-tax employer and extra contributions receive a standard 15% contributions-tax deduction within the calculation. Personal circumstances can produce a different tax outcome.
To estimate employer SG from salary without projecting investment growth, use the Superannuation Calculator Australia.
Which inputs affect your future super balance?
Your opening balance, time until retirement, contribution amounts, net investment returns and fees determine the projection. In salary-based mode, the model also applies the chosen annual salary-growth rate to future eligible earnings.
- Current age and retirement age: determine the projection period. A later retirement age adds more months of assumed contributions and returns.
- Current super balance: sets the opening savings amount.
- Employer contributions: use 12% of modelled eligible earnings in salary mode or a manually entered annual contribution.
- Extra before-tax contributions: represent amounts such as salary sacrifice. The calculator applies the standard contributions-tax assumption.
- Extra after-tax contributions: enter the fund balance without an additional contributions-tax deduction in this model.
- Net annual investment return: represents an assumed return after investment fees and earnings tax. Additional account fees entered separately reduce the result.
- Administration and insurance fees: annual flat charges increase with the selected inflation rate. An optional balance-based account fee is deducted separately.
- Inflation: converts the retirement balance from future dollars to equivalent purchasing power in today’s dollars.
Check that your net investment return and additional fees do not count the same charge twice.
How do contributions and investment returns compound?
Compounding applies each month’s investment return to the balance built up from previous savings, credited contributions and retained investment earnings. The calculator uses the monthly equivalent of the chosen annual return, not simply the annual percentage divided by 12.
For example, with an opening balance of A$50,000, a 6% annual net return and no contributions or additional fees, the illustrative balance after one year is A$53,000. At a 5% return under the same conditions, it is A$52,500. These are calculation examples, not investment forecasts.
With regular contributions, the exact outcome also depends on their timing and the assumed fee deductions. The calculator compares returns one percentage point below and above your selection while holding other inputs constant.
How do you read the growth results?
The future-dollar balance shows the nominal projected balance at retirement; the today’s-dollar balance adjusts that result for inflation. Both figures describe the same modelled savings under different purchasing-power measures.
The results also show your opening balance, future contributions after standard contributions tax and the net investment result after modelled fees. A negative net investment result indicates that returns and charges reduced the outcome relative to opening savings plus contributions.
The line chart shows the estimated balance at successive ages. Open the annual projection table for individual year-end figures. The retirement-age comparison assumes contributions continue until each comparison age, which is an alternative retirement scenario rather than a post-retirement withdrawal estimate.
For a separate explanation of retirement balance forecasting, see the Super Projection Calculator Australia.
What limits apply to these estimates?
The calculator is a simplified accumulation-account model, not personalised financial or tax advice. Market returns fluctuate, while the tool applies a constant assumed annual return. It does not simulate annual market volatility, withdrawals during retirement or fund-specific investment options.
For the 2026–27 financial year, the starting assumptions are a 12% Super Guarantee rate, A$270,830 annual maximum SG earnings base, A$32,500 general concessional contributions cap and A$130,000 general non-concessional contributions cap. These reference values are held constant in later projection years. Actual future legal thresholds can change.
The model warns about general contribution caps but does not prevent contributions above those caps or calculate excess-contributions tax. Carry-forward concessional amounts, bring-forward non-concessional arrangements, total super balance restrictions, Division 293 tax, deduction eligibility and personal fund acceptance rules are outside its scope.
For contribution categories, general limits and annual totals, see the Super Contributions Calculator Australia.
Sources
- Australian Taxation Office, Super guarantee, 2026–27 rates and maximum contribution base.
- Australian Taxation Office, Contributions caps, 2026–27.
- Australian Taxation Office, Concessional contributions cap and Non-concessional contributions cap, accessed October 2026.
- Australian Securities and Investments Commission, Moneysmart, Superannuation calculator, accessed October 2026.