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Financial Glossary
Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods. Unlike simple interest, which is calculated only on the principal, compounding allows your money to grow exponentially over time. The frequency of compounding (daily, monthly, annually) affects the total growth.
Compound interest is often called the eighth wonder of the world because of its ability to generate wealth exponentially over time. The key insight is that your money works for you — earning returns on both your original investment and on previously earned returns. The formula is A = P(1 + r/n)^(nt), where A is the final amount, P is principal, r is annual rate, n is compounding frequency, and t is time. The most important factor in compounding is time, not the amount invested. Starting to invest at age 25 versus 35 can mean hundreds of thousands of dollars difference at retirement, even with the same contribution amount. This is why financial advisors stress the importance of starting early.
Compound interest is the primary mechanism through which salary earners build long-term wealth. By consistently investing a portion of your salary, you harness compounding to multiply your savings. For example, investing 15% of a $75,000 salary ($937 monthly) at 7% return from age 30 to 67 yields approximately $1.8 million — far more than the $422,000 actually contributed. Your salary determines how much you can invest, but time and compounding determine how much that investment grows. Our investment calculator models these scenarios to help you see the impact of different savings rates and time horizons.
If you invest $10,000 at 7% annual return compounded yearly, after 30 years you would have approximately $76,123 without adding any additional money. With monthly contributions of $500, the same investment would grow to approximately $611,729. This exponential growth is why starting to invest early is so powerful.
Compound interest creates exponential growth because you earn returns on your returns. Over long periods, the majority of growth comes from compounding rather than the initial principal. Starting early maximizes this effect.
More frequent compounding (daily vs. annual) results in slightly higher returns. For example, $10,000 at 7% over 30 years yields $76,123 with annual compounding and $76,466 with daily compounding. The difference grows with larger amounts and longer time horizons.
The Rule of 72 is a quick way to estimate how long it takes to double your money: divide 72 by your expected annual return rate. At 7% returns, your money doubles approximately every 10.3 years (72/7 = 10.3). This rule helps visualize the power of compounding without complex calculations.
Starting 10 years earlier can triple your final nest egg. Someone investing $500 monthly from age 25 to 65 at 7% accumulates approximately $1.4 million. Waiting until age 35 to start the same contributions yields only about $650,000 — less than half, despite contributing only $60,000 less out of pocket.
Yes. Credit cards and other high-interest debt use compound interest against you. Minimum payments on a credit card with 20% APR can mean paying two to three times the original purchase amount over time. This is why paying down high-interest debt should typically take priority over investing.
Singapore calculators use data from the following official government agencies:
Our Singapore calculators follow income tax rates, CPF contribution rates, and GST rates published by IRAS and the Ministry of Finance. Economic data is sourced from SingStat and the Department of Statistics. All figures are for educational purposes and should be verified with a qualified professional.
All tax brackets, contribution rates, and economic data used in our calculators are sourced from the official government publications listed above. Rates are updated at least annually to reflect the latest tax year and regulatory changes. Users should verify critical figures with official sources or qualified professionals.
Last updated: June 2026. Information may change; always verify with official sources.
Last Updated: July 2026 — Reviewed Against Official Sources
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