A lump sum gets more time in the market, but results still depend on your return assumptions. Compare conservative, mid, and optimistic scenarios.
Open the Money Growth Calculator| Return rate | Final balance | Amount invested |
|---|---|---|
| 5% (conservative) | ~$162,900 | $100,000 |
| 7% (mid) | ~$196,700 | $100,000 |
| 10% (optimistic) | ~$259,400 | $100,000 |
Investing $100,000 as a one-off lump sum for 10 years is a scenario many Australians face — perhaps after selling a property, receiving an inheritance, or accessing superannuation. At a 7% return your $100,000 grows to around $196,700 — nearly doubling with compounding adding almost $97,000 on top. At 10% it reaches $259,400, a quarter of a million dollars from a single investment. The message is clear — putting a large lump sum to work in the market rather than leaving it in cash can nearly double its value within a single decade.
If you have the money ready now, investing earlier gives compounding more time. Waiting in cash can reduce long‑term growth (but may reduce short‑term risk).
If investing everything at once feels risky, model a smaller lump sum plus monthly contributions. You’ll see the tradeoff between time invested and timing risk.
Often lump sum wins mathematically because money is invested sooner, but behaviour and timing risk matter.
Try 5% (conservative), 7% (mid), 10% (optimistic) to see a range.
No. Treat results as estimates. You can lower the assumed return rate to be conservative.
If the timeline is short, a stable savings option may be safer. Consider using the ETF vs Savings comparison.
See /how-compound-interest-works.html.