An Australia-localised calculator pre-filled in AUD. Use it to project growth inside Superannuation (concessional or non-concessional contributions) or outside super in a personal investment account.
A A$15,000 Super balance plus A$500/month at 7% for 25 years grows to roughly A$425,000 — with the 15% concessional tax rate on contributions and earnings, this is well ahead of an equivalent non-super account at marginal income tax rates.
The Super Guarantee is 12% of ordinary time earnings from July 2025 — your employer pays this on top of your salary, before tax. Concessional contribution cap is A$30,000 per year (2026 indexation).
Compound interest is interest earned on interest. Each period, your balance grows by the previous balance times the periodic rate, then your contribution is added. Over decades the compounded portion dwarfs the contributed portion — the "hockey stick" curve every personal-finance article keeps showing you.
P is your starting amount. PMT is each monthly contribution. r is the monthly rate (annual ÷ 12). n is the total number of months.
In an Australian context: inside Superannuation, concessional contributions (including employer SG) are taxed at 15% on the way in and earnings at 15% — far below most workers' marginal rates. Non-concessional contributions go in after-tax and grow at 15%. After age 60, all Super withdrawals are tax-free. Outside super, full marginal income tax rates and 50% inclusion for capital gains apply — model with a meaningfully lower effective return.
Important: figures are nominal — they don't subtract Australian inflation. To see real growth, subtract a 2–3% CPI estimate from your return assumption.
Compound interest is interest earned on both your original deposit AND on the interest already credited. It causes balances to grow faster over time — the longer you leave money invested, the more dramatic the effect.
Future Value = Principal × (1 + r)n + PMT × ((1 + r)n − 1) / r, where r is the periodic interest rate (annual rate ÷ 12 for monthly compounding) and n is the total number of periods.
For a balanced or growth Superannuation option, 6–8% annualised is a common historical assumption after the 15% concessional tax rate on earnings. Conservative or cash options run much lower. This calculator does not promise any specific return — model multiple scenarios.
No — the figures shown are nominal. To see real (after-inflation) growth, subtract an Australian CPI estimate (typically 2–3%) from your assumed return rate before entering it.
Inside Superannuation, contributions and earnings are taxed at 15% (concessional) or 0% (non-concessional, up to the cap). After age 60, withdrawals are entirely tax-free. Outside super, full marginal rates apply to income and 50% of long-term capital gains are taxable — model with a meaningfully lower effective return if saving outside super.
ProFinanceCast turns one-off calculations into a living 10-year forecast that updates as your income, expenses, and goals change. Free forever for the core forecast.