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Arshathul Afia
Arshathul Afia is a journalism graduate and fintech content writer with 4+ years of experience in digital publishing and research-led writing. She has written 200+ articles covering personal finance, lending, banking, digital payments, credit, insurance, and major financial developments in India. At LoansJagat, she focuses on simplifying complex fintech news, RBI updates, loan-related changes, policy developments, and industry trends for everyday readers. Her journalism background helps her approach stories with research, context, and clarity, while her SEO experience ensures content remains discoverable and relevant. She aims to make financial news easier to understand, practical, and useful for readers across India.
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Compound interest is interest on interest. You can earn compound interest when you deposit money in savings accounts or fixed deposits. Compound interest is earned on the principal amount and interest earned previously. At the same time, Compounding can apply to loans and credit-card balances. It depends on the product terms and applicable rules. That means your money grows faster with compound interest. But if your balance is unpaid, it can increase the total cost of debt. That's why everyone to understand how compound interest works is very important. Loansjagat presents a comprehensive guide to compound interest.
Key takeaways
You can earn interest on the principal amount as well as on previously earned interest with compound interest. That means if you invest ₹100 for 2 years at a 10% annual interest rate, you will earn ₹10 in the first year. Now your balance becomes ₹110 after the first year. In the second year, your 10% interest is calculated on ₹110, which equals ₹11. This is how your ₹100 becomes ₹121 after two years with compound interest.
Compound interest differs from simple interest, where interest is earned only on the initial principal amount.
Compounding applies across different financial products in two main ways:
Compound interest is usually earned on savings and investment products.
The compound interest formula is:
CI = P (1+R/100n)^nt - P
Where,
P = Principal amount
CI = Compound interest
R = Rate of interest
n = n is compounding frequency per year (ex, 12 for monthly, 4 for quarterly, 365 for daily)
t = Time in years
This is the formula that is used in compound interest.
When interest is compounded once a year (n = 1), the formula simplifies to:
CI = P (1+R/100)^t - P
In savings and investments, compounding helps your money grow exponentially because you get returns on your principal as well as on previous returns. It works like a snowball effect.
You benefit much more from compounding when you start early. If you invest for a long time, you get a compounding cycle that grows faster. The best part is that you can start it with a very small amount. This amount grows significantly over 10, 15, or 20 years.
Devendra is thinking about investing ₹1,00,000 in compound interest. He wants to invest for 3 years at a 10% interest rate. Let's see how much he will earn after three years with compound interest. Here, I am using the compound interest annual formula.
CI = P (1+R/100)^t - P
= 1,00,000 (1+10/100)^3 - 1,00,000
= 1,00,000 (11/10)^3 - 1,00,000
= 1,00,000 (1331/1000) - 1,00,000
= 1,33,100 - 1,00,000
= 33,100
That means Devendra will earn 33,100 after 3 years if he invests in a compounding financial asset like a Fixed Deposit.
Because compounding also applies to borrowing, unpaid interest can accumulate quickly. Instead of trying to avoid compound interest altogether. Since most modern financial products use it, borrowers should focus on:
So, at the bottom of Loansjagat's compound interest guide, you know how compound interest works. Compounding is powerful. It accelerates wealth building for savers but compounds debt quickly for borrowers who carry rolling balances. It can save your money way faster than simple interest. For example, if you invest 100 in both compound and simple interest for 2 years at 10%. After 2 years, you will get 121 from compound interest and 120 from simple interest.
Compound interest is the interest earned on the principal amount and previous interest. That means if you invest money, you will get interest on it first, and then you are going to get interest on your invested sum as well as on the interest which you earned previously.
Simple interest is different from compound interest. When you invest money, you are going to get interest only on your invested sum every time. That means if you invest 100 for 5 years at 10%. You are going to get 10 for 5 years.
What is the formula for compound interest?
The compound interest formula is CI = P (1+R/100)^t - P. Where “P” is your principal amount, “R” is the rate of interest, and “t” is the number of years for which you are investing money.
Each round of interest is calculated on the principal plus all interest earned so far, so previously earned interest starts earning interest too. In compound interest, balance grows faster than simple interest, especially over a longer period.
FDs, RDs, Credit Cards, Personal Loans.
Your principal amount, rate of interest, and number of years can affect your compound interest.
Compound interest is beneficial for investors who are investing for the long-term. Because when they invest for the long term, their money grows exponentially. Every time they earn interest. It benefits long-term investors, but works against long-term borrowers.
People can minimise borrowing costs by making timely payments and, where permitted, making early principal prepayments. Focus on making early principal prepayments, which reduces the base balance and saves on total lifetime interest.
You need to invest for the long term if you want to get more benefits of compound interest.
Who provides compound interest?
In India, commercial banks like SBI, HDFC, and ICICI Bank offer compound interest rates. Also, post offices and credit card providers offer compound interest.
