Fixed deposits (FDs) are a popular investment in India, usually considered valuable for their stability and predictable returns. But how is the interest on an FD calculated—is it simple or compound? Understanding this can help you make better investment decisions.
In this blog, we explore in detail how an FD works and how interest rate for an FD is calculated.
Simple Interest vs. Compound Interest: What’s the Difference?
Simple Interest is when the interest is calculated only on the original amount you invest (the principal). Each year, you earn the same interest, and it does not increase over time.
- For instance, let’s say you invest ₹1,00,000 at 7% simple interest, you earn ₹7,000 each year. After two years, your total interest is ₹14,000.
On the other hand, compound Interest is when the interest is calculated on the principal plus any interest earned previously. This means your money grows faster, as you earn “interest on interest.”
- For example, if you invest ₹1,00,000 at 7% compound interest, you earn ₹7,000 in the first year. In the second year, interest is calculated on ₹1,07,000, so you earn ₹7,490. Over two years, your total interest is higher than with simple interest.
Do Fixed Deposits Offer Simple or Compound Interest?
Fixed deposits earn compound interest and not simple interest.
Usually, the most common compounding frequency offered by banks and non-banking financial companies (NBFCs) is quarterly, but some institutions may offer monthly or daily compounding. With compounding, your maturity amount will be higher than with simple interest, especially over longer tenures.
Compounding Frequency in Fixed Deposits
While all FDs earn compound interest, the compounding frequency may differ across financial institutions. The compounding frequency impacts the maturity amount you get on FDs. You may use an online FD calculator to understand this better.
The main compounding frequencies offered are:
- Quarterly Compounding: Interest compounds every 3 months
- Monthly Compounding: Interest compounds every month
- Daily Compounding: Interest compounds daily
The higher the compounding frequency, the better it is for you as an investor. Your money grows faster with monthly and daily compounding compared to quarterly compounding.
Here’s an example:
Compound Interest Fixed Deposit Details:
- Principal: ₹1,00,000
- Interest rate: 7%
- Tenure: 1 year
With quarterly compounding, the maturity amount is ₹1,07,280
With monthly compounding, the maturity amount is ₹1,07,325
With daily compounding, the maturity amount is ₹1,07,330
As seen above, frequent compounding gives higher returns by accelerating your interest payouts.
Factors Impacting Interest Payouts
While the default compounding is quarterly for most FDs, the actual interest gain depends on a few variables.
- Principal Amount: The higher your investment amount, the higher will be your interest payouts.
- Tenure: Longer-term FDs allow interest compounding over an extended period, leading to better returns.
- Age: Senior citizens and women depositors can earn additional bonus interest on certain FDs across financial institutions.
- Frequency of Compounding: As shown earlier, frequent compounding results in bigger interest gains.
- Interest Rates: Opting for financial institutions offering relatively higher FD interest rates means a higher accumulation of interest. Top financial institutions typically offer interest rates starting at 5% p.a. on FDs.
Using the FD Interest Calculator
The best way to determine your interest payout is by using the FD compound interest calculator available on financial institutions’ websites or portals.
Based on your inputs of parameters like amount, tenure, age, compounding frequency, etc., the compound interest calculator for fixed deposit shows the maturity amount along with accrued interest conveniently.
Benefits of Compounding Interest on Fixed Deposits
Here are some major advantages of earning compound interest on your fixed deposits:
- Accelerates your investment growth through the compounding effect to build a higher corpu
- Rewards you for long-term investing with exponentially growing income
- Allows reinvesting maturity proceeds to earn interest on interest for greater accruals
- Supports financial goals like retirement, children's education, house buying, etc., through focused investing
In short, FDs serve as a fixed-income instrument offering risk-free returns aided by the power of compounding over time.
Maximising FD Returns with Reinvestment
An effective way to maximise the benefits of compounding interest is by reinvesting the principal plus interest payout received post maturity.
This deposit made using maturity proceeds continues earning interest on a larger capital every subsequent term. Reinvestment over multiple terms exponentially grows your returns. Reinvesting maturity proceeds helps your FD portfolio snowball faster to build long-term wealth assuredly.
The Bottom Line
Unlike savings accounts offering simple interest calculations, a compound interest fixed deposit computes interest on a compound basis. Quarterly compounding allows interest to accrue every quarter and accelerate your returns. Several banks provide options for monthly and daily compounding, too, which further amplifies income. So, rather than staying idle, your money multiplies itself faster when invested in fixed deposits over time!