Calculate the compounded future value of a $1,000,000 lump sum over 50 years, fully adjusted for inflation.
Starting from $1,000,000 and compounding at Australia's long-horizon equity return assumption of 9%, your investment reaches a nominal value of $74.36M after 50 years. After deflating that by 2.5% annual inflation, its real purchasing power in today's money is $21.63M — a 70.9% erosion driven entirely by the gap between nominal returns and price increases.
At a 9% return rate, your money doubles roughly every 8 years (Rule of 72). At 2.5% inflation, prices double every 29 years. Your real return — the only return that matters for purchasing power — is 6.5% per year.
| Year | Nominal value | Real value (today's purchasing power) | Purchasing power lost |
|---|---|---|---|
| 5 | $1.54M | $1.36M | 11.6% |
| 10 | $2.37M | $1.85M | 21.9% |
| 15 | $3.64M | $2.52M | 31.0% |
| 20 | $5.6M | $3.42M | 39.0% |
| 25 | $8.62M | $4.65M | 46.1% |
| 30 | $13.27M | $6.33M | 52.3% |
| 35 | $20.41M | $8.6M | 57.9% |
| 40 | $31.41M | $11.7M | 62.8% |
| 45 | $48.33M | $15.91M | 67.1% |
| 50 | $74.36M | $21.63M | 70.9% |
The return rate you can actually achieve is the single biggest lever on the final corpus. Three return scenarios:
| Scenario | Return assumption | Nominal in 50 yrs | Real in 50 yrs |
|---|---|---|---|
| Conservative | 6% | $18.42M | $5.36M |
| Expected | 9% | $74.36M | $21.63M |
| Optimistic | 12% | $289M | $84.08M |
The future value is calculated using two primary steps:
Where: PV = Present Value (initial amount), r = annual return rate, i = annual inflation rate, and n = duration in years.
Investing $100,000 at an 8% annual return rate for 30 years yields a nominal corpus of $1,006,265. However, at a standard 2.5% inflation rate, its purchasing power today is only $479,729, representing a 52.3% loss in value.
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