What Is Compounding?

Said to be the eighth wonder of the world, compound interest rewards those who start their financial journey early and save money regularly. Compound interest lets you earn interest on your interest, leading you to accumulate a huge corpus over a long period of time. In this article, we are going to learn what compounding is, how it works, how it can benefit your investment journey, which instruments offer compound interest, and how you can use compound interest to your advantage.

Compounding means your money is earning interest by reinvesting the interest earned. The magic of compounding can turn a small amount invested regularly into a very large corpus. For example, you deposited ₹10,000 in a savings account that accrues 10% interest annually. After one year, you would have ₹11,000 in your account. After two years, your interest would have compounded, and you would have ₹12,100.

One way to think of compound interest is as "interest on interest," as it creates a chain reaction of interest calculations based on the accumulated amount. Compared to simple interest, which is calculated solely on the principal amount, compound interest ensures better returns on investments. It adds the accrued interest before calculating future interest payments.

The power of compounding enables your savings to grow exponentially. Here’s how compounding works:

For example, you deposited ₹10,000 in a savings account that accrues 10% interest annually. After one year, you would have ₹11,000 in your account. After two years, your interest would have compounded, and you would have ₹12,100.

This is because you are not just earning 10% interest on your initial deposit (₹10,000), you are also earning interest based on your new total earnings (₹11,000). Hence, after two years, you will earn your 10% interest based on your new total of ₹11,000. Here's a table explaining the entire process.

Here’s the formula to calculate the compound interest, if you wish to know the technical process.

FV = Future Value
PV = Present Value
I = Rate Of Interest
n = Compounding Periods

The calculation of the above example will look like this.

Beginning amount - ₹10,000

1st-year - ₹10,000 + (100 x 10%) = ₹11,000
2nd-year - ₹11,000 + (110 x 10%) = ₹12,100
3rd-year - ₹12,100 + (121 x 10%) = ₹13,300

After 10 years, your ₹10,000 deposit would grow to ₹25,937. That's the power of compounding.

There are multiple benefits of compounding over time. Let’s look at some of them.

Exponential Growth: As your investments earn returns, those returns are reinvested to earn even more returns. This leads to exponential growth. The longer the investment period, the more pronounced the effect of compounding. Starting to invest early is beneficial.

Mitigate Inflation: Compounded returns help investments grow at a rate that can outpace inflation. This preserves and increases the real value of money over time.

Risk Mitigation Over Time: Over the long term, the effects of market volatility tend to smooth out. Compounded growth can offset periods of market downturns. Longer investment horizons lower the impact of short-term market fluctuations on the overall investment portfolio.

Wealth Creation: By reinvesting earnings, investors can diversify their portfolios. This allows them to take advantage of various growth opportunities.

Time plays a crucial role in the compounding process, as it allows the earnings on an investment to generate their own earnings. Let’s take a look at how time influences compounding and its overall importance.

Exponential Growth Over Time - The longer the investment period, the greater the compounding effect. For example, an investment might take several years to double initially, but as compounding continues, the subsequent doublings occur more quickly.

Early Start Benefits - Investing early allows more time for compounding, significantly increasing the final amount. For example, if you start investing 5000 per month from the age of 25 with an annual return of 12%, it can grow to 1.76 crore by 55. However, if you invest 10,000 per month in an SIP from the age of 40 with an annual return of 12%, it can grow to only 50.45 lakhs by 55.

Risk Mitigation Over Time: Over the long term, the effects of market volatility tend to smooth out. Compounded growth can offset periods of market downturns. Longer investment horizons lower the impact of short-term market fluctuations on the overall investment portfolio.

The Power of Reinvestment - By reinvesting dividends, and other earnings, the principal grows, leading to more significant future returns. Over time, the reinvested earnings can contribute significantly to the overall growth.

Time Mitigates Volatility - Over the long term, market volatility tends to average out, and the compounding effect can help recover from short-term losses.

Inflation and Time - Long-term compounding ensures that the future purchasing power of money is maintained, which allows for better financial security.

There are some effective strategies to maximise the power of compounding.

Start Early - The earlier you start investing, the more time your money has to compound. Even small amounts can grow considerably over long periods.

Regular Contributions - Invest a fixed amount regularly, regardless of market conditions. This not only increases the principal but also ensures continuous compounding.

Reinvest Earnings - Choose to automatically reinvest dividends, interest, and capital gains. The more frequently returns are compounded, the greater the compounding effect.

Long-Term Investment Horizon - Keep investments for the long term to fully benefit from compounding. Avoid the temptation to withdraw or frequently switch investments.

Diversification - Diversify your investments across different asset classes to reduce risk and boost growth potential. A well-diversified portfolio can contribute to more consistent compounding.

The frequency at which your interest gets compounded plays a crucial role in inflating your investment. You may come across various standards of the frequency of compounding, as it can be daily, monthly, or even semi-monthly. The more the frequency of compounding, the higher the effect on the initial amount.

For beginners, it may come as a surprise, but the compound interest on ₹50,000, compounded at 10% annually, is less than the compound interest on ₹50,000 compounded at 5% semiannually when calculated for the same period.

Due to this reason, you may want to select a lower compound rate that gets compounded frequently instead of a scheme with a higher simple interest rate. As you earn interest on interest, you end up making heavy returns on your investments. It is the reason you will often come across the term, 'power of compounding.'

Simple interest is interest that's paid only on the initial principle of a loan, and not on any interest from previous periods. In simple terms, the interest is not compounded and only applies to the principal amount.

For example, if you invest ₹10,000 at a 5% annual rate for one year, the simple interest calculation will look like this:

₹10,000 x 0.05 interest x 1 year = ₹500 simple interest earned after one year

If you wish to calculate simple interest over more than one year, calculate the interest earnings using the principal from the first year, multiplied by the interest rate and the total number of years.

₹10,000 x 0.05 interest rate x 3 years = ₹1500 simple interest for three years.

The underlying principle of mutual funds is to help investors make the most of their investments using the power of compounding. Investors gain profit when the amount of the fund of units goes up. If the investment is of a long-term period, the compounding power can help you to grow your investment by significant amounts.

There are several stories of how lenders, businessmen, and merchants have used the power of compound interest for becoming and staying rich. One of the best examples is that of Warren Buffett, one of the wealthiest people in the world, who leveraged the strategy of a business that involved compounding investment returns over a period of time.

As we have mentioned before, mutual funds offer compound interest. This means, your investments will earn compound interest and offer you a significant amount of money over a long period of time.

On the other hand, if you have to pay the compound interest on a loan, you may even end up giving a larger amount of money than you had borrowed. But the good news is that most large loans, such as home loans and auto loans, make use of simple interest. However, there is one common type of debt that makes use of compound interest.

It may come as a surprise, but most credit card users are not aware of this fact. Credit card lenders use compound interest on your outstanding amount on a daily basis. This interest starts accruing after your interest-free time is over. It is also the reason that financial experts recommend paying your credit card bills well in advance and not waiting for the last date. You can also use auto-payment facilities to avoid such high charges.

Compound interest holds a huge power when it comes to making your small, regular investments into a considerable amount of money. Invest in those instruments that compound your money monthly or every 3 months instead of compounding annually. Choose to stay invested in such instruments for a long period of time, typically 7 to 10 years or more, to let compounding do its magic.

As mentioned above, compound interest on loans and credit cards, is something you should be careful about. It is important to pay your credit card bills to not rack up debt. Compound interest might be an ally when it comes to your investments in mutual funds, but they are an enemy when it comes to credit card bills.

Understanding the difference between simple and compound interest and their importance in your financial life will help you make informed decisions, be it choosing the right investment instrument or the right type of loan. If you wish to learn more about such topics that will help you make good money decisions, follow Koshex. We are a platform designed to help Indian investors manage their money better. Head over to our Blogs section to read more such blogs.