August 29, 2023 | Allison Robertson

Understanding Compound Interest: The Power Of Money's Growth


When it comes to the world of finance and savings, few terms are as critical to understand as compound interest. 

Often dubbed the "eighth wonder of the world," compound interest can be a game-changer in how we view savings and investments. 

But what is it, and why is it so crucial for the average person to comprehend?

What Is Compound Interest?

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Compound interest is the interest calculated on the initial principal, and also includes all of the accumulated interest from previous periods on a deposit or loan. 

Think of it as “interest on interest,” and it can cause a sum of money to grow exponentially over time.

Simple Interest Vs. Compound Interest

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Simple Interest is calculated only on the principal, or on the portion of the principal which remains unpaid. For instance, if you deposit $100 in a bank at a simple interest rate of 5% annually, you'll earn $5 each year, indefinitely.

Compound Interest, on the other hand, builds upon itself. Using the same example but with compound interest, the first year, you'd earn $5 just like with simple interest. However, the second year, you'd earn interest on $105 (your initial $100 plus the $5 interest from year one) instead of just your initial $100.

The Power Of Compounding

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The more frequently interest is added to the total, the faster your money will grow. This frequency is typically described as annually, semi-annually, quarterly, or even daily. 

The more often your interest compounds, the more you earn.

The Rule Of 72

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A quick way to estimate how long it will take for your money to double through compound interest is the Rule of 72

Simply divide 72 by your interest rate, and the result is approximately how many years it will take to double your money. 

For example, with a 6% interest rate, it would take about 12 years (72 ÷ 6 = 12).

Compound Interest In Savings

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When saving money in an account that offers compound interest, the earlier you start, and the longer you can leave your money untouched, the more you'll have in the end. 

Even if you can't contribute more, letting it grow can result in substantial gains over time.

Compound Interest In Loans

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Just as compound interest can work in your favor when saving, it can also work against you when borrowing. 

Credit cards, for instance, utilize compound interest, which is why many people find themselves in larger debt than they anticipate if they only make minimum payments.

The Importance Of Consistency

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Regular contributions, even if they're small, can lead to impressive results over time, thanks to compound interest. By regularly adding to your savings or investments, you can harness the full power of compounding.

Tools To Help

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There are many online compound interest calculators that can assist in visualizing how your money can grow over time. By tweaking variables like the amount, interest rate, and time, you can see potential future outcomes.

Watch Out For Fees

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While compound interest can accelerate your savings, high fees in certain bank accounts or funds can counteract its effects. Always be aware of any fees and factor them into your decisions.

The Time To Start Is Now

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Understanding compound interest is foundational in financial planning. Its effects are most pronounced over extended periods, so the sooner you can leverage it, the better off you'll be. 

Whether you're saving for retirement, a large purchase, or simply want to grow your wealth, recognizing the power of compound interest is the first step toward reaching your financial goals.


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