Power of Compounding Interest

Compounding is the process of earning returns on both your principal and your previously earned returns — making your money grow exponentially over time. Here is how it works.
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5 mins
17-March-2026

IN SUMMARY

The power of compounding means your investment earns returns on both the principal and accumulated gains, accelerating wealth creation over time. For instance, Rs. 1,00,000 at 10% p.a. for 5 years grows to Rs. 1,61,051 with compounding versus Rs. 1,50,000 with simple interest—an extra Rs. 11,051 purely from reinvested returns. The formula A = P(1 + r/100)ⁿ shows that time is the most critical factor in maximising growth.
 

This principle is effectively applied in fixed deposits, where cumulative options reinvest interest annually to boost returns. Bajaj Finance offers cumulative FDs at up to 7.75% p.a. for senior citizens, with strong safety ratings from CRISIL AAA/STABLE and [ICRA]AAA(Stable), making them a reliable compounding investment choice.


Key rule: The longer you stay invested, the more powerful compounding becomes. Time is the most critical variable — not the amount.


The power of compounding refers to the ability of an investment to generate earnings not only on the original principal amount, but also on the accumulated interest earned over time.

There are multiple investment options where the power of compounding is used and the interest earned is credited on your invested funds. These investment plans typically feature a clear compounding period, such as yearly, monthly, or even daily, allowing you to take advantage of compounding as needed. One of these investments is fixed deposit. Before we learn about how power of compounding impacts fixed deposit, let us know about the power of compounding.

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What is the power of compounding?

The power of compounding is the principle by which an investment generates returns not only on its original principal but also on all previously earned returns — so that each compounding period, the base on which interest is calculated grows larger.

This is fundamentally different from simple interest, where interest is always calculated on the original principal only.

Formal definition: Compounding is the process of reinvesting earnings (interest, dividends, or capital gains) back into the investment, so that those earnings themselves generate further returns in subsequent periods.

The compound interest formula:

A = P × (1 + r/100)ⁿ

Where: A = Maturity amount | P = Principal invested | r = Annual rate of interest (%) | n = Number of years

Compound interest earned = A − P


Worked example:

P = Rs. 1,00,000 | r = 10% p.a. | n = 5 years

A = Rs. 1,00,000 × (1.10)⁵ = Rs. 1,61,051

Compound interest earned = Rs. 61,051

Simple interest (same parameters) = Rs. 50,000

Compounding advantage = Rs. 11,051 — from interest earning interest alone.


The compounding advantage grows non-linearly: it is modest in early years and accelerates significantly over longer horizons, which is why starting early is the single most important compounding decision an investor can make.

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Does compounding frequency matter? — Daily vs Monthly vs Annual compounding on Rs. 1 Lakh


Compounding FrequencyRs. 1 Lakh @ 7% p.a. — 1 YearRs. 1 Lakh @ 7% p.a. — 5 YearsRs. 1 Lakh @ 7% p.a. — 10 Years
AnnualRs. 1,07,000Rs. 1,40,255Rs. 1,96,715
QuarterlyRs. 1,07,186Rs. 1,41,478Rs. 2,00,160
MonthlyRs. 1,07,229Rs. 1,41,763Rs. 2,00,966
DailyRs. 1,07,250Rs. 1,41,902Rs. 2,01,358

Note: Figures are illustrative, calculated using A = P × (1 + r/n)^(n×t), where n = compounding frequency per year. Bajaj Finance cumulative FDs compound annually. More frequent compounding generates marginally higher returns on the same principal and rate — the difference becomes more pronounced over longer tenures. Actual FD returns depend on the contracted rate and tenure.

 

How the power of compounding works in investments?

The power of compounding is something that can build generational wealth with just a small initial investment. It is one of the most powerful forces in investing, and it can turn a small investment into a large sum over time. Whether it is a safe investment option like a fixed deposit or the Systematic Investment Plan (SIP), both work on the power of compounding.

Here, the interest is first accrued on the initial deposit amount then eventually as tenure progresses the initial deposit amount increases as the initial deposit is now considered as principal amount plus interest accrued.

The power of compounding is the ability of an asset to generate earnings, which are then reinvested to generate their own earnings. This process can be illustrated with the use of fixed deposit and mutual funds.

Start early and invest smart. Open an FD with Bajaj Finance with just Rs. 15,000 and benefit from flexible tenures ranging from 12 to 60 months. Check rates.

Also read: What is Investment Policy Statement (IPS)

 

Power of Compounding — A Worked Example with Simple vs Compound Interest

Arjun and Kavya both want to retire at 60 with a corpus of Rs. 1 crore. Both invest in instruments averaging 8% p.a. compounded annually.


Arjun starts at age 25. He needs to invest approximately Rs. 4,627/month for 35 years — a total contribution of approximately Rs. 19.4 lakh — to reach Rs. 1 crore.


Kavya starts at age 35. She needs to invest approximately Rs. 10,524/month for 25 years — a total contribution of approximately Rs. 31.6 lakh — to reach the same Rs. 1 crore.


The outcome: Kavya has to invest Rs. 12.2 lakh more than Arjun — simply because she started 10 years later. The compounding that Arjun's early instalments did between age 25 and 35 cannot be replicated by higher contributions later. This is the irreplaceable advantage of starting early.


For investors seeking a capital-safe compounding vehicle: A Bajaj Finance cumulative Fixed Deposit (CRISIL AAA/STABLE and [ICRA]AAA(Stable)) at 7.40% p.a. for 60 months grows Rs. 5 lakh to Rs. 7,11,162 at maturity — with no market risk and predictable returns. Open an FD at bajajfinserv.in/investments/fixed-deposit with a minimum deposit of Rs. 15,000.


Note: All figures are illustrative, based on compound interest at assumed rates. Actual investment returns depend on the instrument, rate, and market conditions. Mutual fund returns are not guaranteed.

The formula for Compound Interest

There is a simple formula in which you can calculate compound interest that is, sum of the amount of principal and interest – the principal amount at present.

Formula:

P(1 + r/100)n – P


Where, P is the principal amount, n is the number of years, and r is the rate of interest.

Add example of let’s say a person called XYZ invested Rs. 1,00,000 for 5 years at 10% p.a. returns.

  • Scenario 1: The interest earned is withdrawn every year.
    At the end of 5 years XYZ will end up earning an interest of Rs. 50,000.
  • Scenario 2: The interest gets added back to the principal amount every year.
    At the end of 5 years XYZ will end up earning an interest of Rs. 61,051.

This clearly shows the power of compounding.

How does the compounding work in a fixed deposit?

Fixed deposits are safe investment options that offer
profitable returns. With Bajaj Finance you can invest in a fixed deposit with just Rs. 15,000. It offers customers an investment tenure of 12 to 60 months and the interest rate also varies during this tenure.

Check the latest FD rates.

There are two types of fixed deposit:

Cumulative fixed deposit: In this the interest is compounded annually and the principal amount along with the interest is paid at maturity.
So, every year the interest you earn on your deposits, gets added to the principal amount, which then becomes the principal amount for the next year.

Non-cumulative fixed deposit: These plans pay interest on a monthly, quarterly, half-yearly, or yearly basis. The interest in this case is paid to the investor on a periodic basis, whereas the principal amount is paid at maturity.

The effect of compounding can be significant over the long-term, particularly for investments with a high rate of return and a long investment horizon. For example, if you invest Rs. 1,00,000 in a fixed deposit with an annual interest rate of 7% for 5 years, the total amount you would receive at maturity would be Rs. 1,40,260. However, if the interest is compounded annually, the total amount you would receive at maturity would be Rs. 1,40,710, which is an additional Rs. 450 due to the power of compounding.
It is important to note that the interest rate, compounding frequency, and investment horizon are all important factors that can impact the power of compounding in fixed deposits. Therefore, it is essential to carefully consider these factors when selecting a fixed deposit to ensure that you maximise the benefits of compounding.

Check the latest Bajaj Finance FD rates and choose between cumulative or non-cumulative options based on your goals. Book FD.

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What is the Power of Compounding in Mutual Funds?

The power of compounding can work wonders in mutual funds, potentially helping investors achieve their financial goals faster.
In mutual funds, investors can harness the power of compounding through Systematic Investment Plans (SIPs). With an SIP, investors can invest a fixed amount at regular intervals, such as monthly, quarterly or semi-annually, which is then invested in the fund of their choice. The returns earned on these investments are then reinvested back into the fund, allowing the investor to take advantage of the compounding effect.
Over time, this compounding effect can lead to significant growth in the value of the investment.

For example, let's say an investor starts an SIP of Rs. 5,000 per month in an equity mutual fund with an assumed average annual return of 12%. After 10 years, the investment would have grown to approximately Rs. 12 lakhs, with the investor having invested a total of Rs. 6 lakhs over the 10-year period. However, if the investor had not reinvested their returns and simply withdrawn them, the investment would have grown to only around Rs. 9 lakhs, representing a significant difference in returns.

Mutual funds provide a great avenue for investors to take advantage of the power of compounding through regular investments using SIPs. By reinvesting returns and staying invested for the long-term, investors can potentially achieve their financial goals faster and generate higher returns over time.

What are the advantages of compound interest?

Compound interest has several advantages, including:

1. The ability to earn interest on both the original principal and the accumulated interest.
2. The potential for significant growth over time.
3. The ability to compound interest on a regular basis, which can accelerate growth.
4. It can be a powerful tool for building wealth and reaching long-term financial goals.
5. It also can be used to grow savings for retirement, education, and other expenses. 

How Do You Maximise the Power of Compounding? — 5 Key Rules

  • Start early: Time is your biggest asset. The sooner you begin, the more you’ll gain.
  • Stay consistent: Regular investments strengthen compounding effects.
  • Think long-term: Short-term withdrawals can break the compounding cycle.
  • Diversify smartly: Spread your investments to reduce risk.
  • Be patient: Compounding rewards those who stay invested.

Ready to grow your savings the smart way?

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Conclusion

The power of compounding proves that you don’t need to be wealthy to build wealth — you just need to start early and stay disciplined. Whether you prefer the stability of a Fixed Deposit or the flexibility of Mutual Funds, compounding helps your money work harder every year.

For investors seeking safety and assured returns, Bajaj Finance Fixed Deposit offers one of the most reliable ways to benefit from compounding. With a AAA rating by CRISIL and ICRA, your investment remains secure while steadily growing over time. Check eligibility.

Frequently Asked Questions

What is the power of compounding?

The power of compounding is the ability of an investment to earn returns on both the original principal and all previously accumulated returns. This creates a "snowball effect" where growth accelerates over time. For example, Rs. 1,00,000 at 10% p.a. simple interest earns Rs. 50,000 over 5 years. With annual compounding, the same investment earns Rs. 61,051 — Rs. 11,051 more, purely from interest earning interest.

What is the formula for compound interest?

The compound interest formula is: A = P × (1 + r/100)ⁿ, where A is the maturity amount, P is the principal, r is the annual interest rate (%), and n is the number of years. Compound interest earned = A − P. Example: Rs. 1,00,000 at 7% p.a. for 5 years: A = 1,00,000 × (1.07)⁵ = Rs. 1,40,255. Compound interest = Rs. 40,255.

What is the difference between simple interest and compound interest?

Simple interest is always calculated on the original principal only. Compound interest is calculated on the growing balance — principal plus all previously earned interest. On Rs. 1,00,000 at 10% p.a. over 5 years: simple interest = Rs. 50,000 (fixed Rs. 10,000/year). Compound interest (annual) = Rs. 61,051 — because each year's interest is added to the principal before the next year's interest is calculated. The difference widens significantly over longer tenures.

How often is interest compounded, and does it matter?

Interest can be compounded daily, monthly, quarterly, or annually. More frequent compounding generates higher effective returns on the same nominal rate. Example: Rs. 1 lakh at 7% p.a. for 10 years — annual compounding yields Rs. 1,96,715; monthly compounding yields Rs. 2,00,966; daily compounding yields Rs. 2,01,358. The difference is modest but grows with tenure and principal size. Bajaj Finance cumulative FDs compound annually.

How does compounding work in a Fixed Deposit?

In a cumulative Fixed Deposit, interest is compounded annually — meaning the interest earned in Year 1 is added to the principal and becomes the base for Year 2's interest calculation. Bajaj Finance cumulative FD at 7.40% p.a. (non-senior citizen, 24–60 months): Rs. 5 lakh invested for 5 years grows to approximately Rs. 7,11,000 at maturity. In a non-cumulative FD, interest is paid out periodically and does not compound.

How does compounding work in mutual funds and SIP?

In mutual funds, compounding occurs through reinvestment of returns — dividends and capital gains are ploughed back into the fund, increasing the unit base that generates future returns. In an SIP, each instalment also benefits from rupee-cost averaging alongside compounding. A Rs. 5,000/month SIP at 12% p.a. grows from Rs. 6 lakh invested (over 10 years) to approximately Rs. 12 lakh — with the additional Rs. 6 lakh generated entirely by compounding and reinvestment.

Why does starting early matter so much for compounding?

Starting early dramatically reduces the amount you need to contribute to reach the same goal — because early contributions have more time to compound. An investor starting at 25 needs approximately Rs. 4,627/month at 8% p.a. to reach Rs. 1 crore by age 60. An investor starting at 35 needs approximately Rs. 10,524/month — more than double — to reach the same corpus. The 10 extra years of compounding cannot be compensated by higher contributions alone.

Can compound interest make you rich?

Over a sufficiently long horizon, yes — compound interest is the primary mechanism through which ordinary investors build substantial wealth. At 8% p.a. compounding, Rs. 1 lakh doubles approximately every 9 years (Rule of 72: 72 ÷ 8 = 9). Over 36 years, it grows 16× to approximately Rs. 16 lakh — without adding a single rupee. The key variables are: rate of return, time invested, and consistent reinvestment of returns.

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