MONEY / PRACTICAL GUIDE
Compound Interest Explained With a Simple Example
Understand how returns can build on earlier returns and why rate, time and consistency matter.
The short answer: Compounding occurs when growth is calculated on the original amount and on previous growth. Time increases its effect, but actual investment returns vary and can be negative.
A simple illustration
At a hypothetical 5% annual rate, $1,000 becomes $1,050 after one year. If the full amount remains, the next year’s 5% is calculated on $1,050. The example ignores taxes, fees and changing rates.
Time and rate interact
Small differences in rate can create large differences over long periods. That also means fees and losses compound. Use realistic scenarios rather than one optimistic forecast.
Contributions matter
Regular additions can matter as much as the assumed return. Separate how much you contributed from how much came from growth when evaluating progress.
Use calculators as scenarios
A calculator demonstrates assumptions. Try lower returns, interruptions and fees. Treat the result as a range for planning, not a promise.
Put it into practice
Try this: Calculate one saving scenario with three return assumptions and fees. Compare contributions with growth instead of focusing only on the final total.
Sources and further reading
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Educational purpose: This guide provides general education. It does not provide personalised financial, investment, legal or tax advice.