Calculate the compounded future value of a $1,000,000 lump sum over 40 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 $31.41M after 40 years. After deflating that by 2.5% annual inflation, its real purchasing power in today's money is $11.7M — a 62.8% 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 |
|---|---|---|---|
| 4 | $1.41M | $1.28M | 9.4% |
| 8 | $1.99M | $1.64M | 17.9% |
| 12 | $2.81M | $2.09M | 25.6% |
| 16 | $3.97M | $2.67M | 32.6% |
| 20 | $5.6M | $3.42M | 39.0% |
| 24 | $7.91M | $4.37M | 44.7% |
| 28 | $11.17M | $5.59M | 49.9% |
| 32 | $15.76M | $7.15M | 54.6% |
| 36 | $22.25M | $9.15M | 58.9% |
| 40 | $31.41M | $11.7M | 62.8% |
The return rate you can actually achieve is the single biggest lever on the final corpus. Three return scenarios:
| Scenario | Return assumption | Nominal in 40 yrs | Real in 40 yrs |
|---|---|---|---|
| Conservative | 6% | $10.29M | $3.83M |
| Expected | 9% | $31.41M | $11.7M |
| Optimistic | 12% | $93.05M | $34.66M |
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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