Which FD is better for compounding: cumulative or non-cumulative?

Suitability of the type of FD can depend on your goal. A cumulative FD is generally suitable when the goal is to accumulate wealth. A non-cumulative FD pays interest periodically and can be more suitable when regular income is required.

Is FD interest compounded monthly or quarterly?

The compounding frequency depends on the bank’s term. Quarterly compounding is common for cumulative FDs in most banks, but investors should check the specific FD product terms.

Does a longer FD tenure increase the benefit of compounding?

Generally, a longer investment period gives more time for accumulated interest to earn further interest. However, investors should also consider interest rates, liquidity requirements and tax implications while choosing the FD.

Does compound interest increase the FD maturity amount?

Yes. When interest is reinvested and compounded, the accumulated amount can be higher than what you would receive if interest were calculated only on the original principal.

How Compound Interest Works in Fixed Deposits

Compound interest helps your FD grow faster as interest earns interest. See examples.

JioFinance Team

5 mins read · 16 Oct 2026

How Compound Interest Works in Fixed Deposits

Compound interest allows your interest to earn further interest over the period and has the potential to increase your maturity amount.
Cumulative FD accumulates interest that is generally reinvested until maturity. Compounding frequency may vary from bank to bank and affect the maturity amount.
Reinvestment FD is an ideal choice for wealth accumulation, while a non-cumulative FD can be a source of regular income.
Along with a high interest rate, other factors like tenure, liquidity, compounding frequency, and taxes also have to be considered.

Interest earned on your FD for the first quarter may look modest. When the same interest is added back to your FD principal, the next round of interest calculation happens on a larger amount. That is the magic of compounding.

What is Compounding Interest in a Fixed Deposit?

Cumulative interest in an FD is the calculation of interest on the principal and accumulated interest from the date of investment. In a cumulative FD, interest is generally reinvested instead of a periodic payout.

For example, suppose you invest ₹2,00,000 at 7% per annum with annual compounding. In the first year, the interest is ₹14,000. If that interest is added to the deposit, your effective amount becomes ₹2,14,000. In the second year, you earn 7% on ₹2.14 lakh instead of ₹2 lakh.

How Does the Power of Compounding Work?

Compound interest is calculated using the following formula

Maturity Value of FD = P(1 + r/n)nt

Where,

P – Principal amount

r – annual interest rate ( in decimal)

n – number of compounding periods per year

t – tenure of FD

The power of compounding becomes clearer when you look at how the deposit grows over time.

Let's assume the initial FD amount is ₹1,00,000, which is booked at a 7% p.a. interest rate for two years with quarterly compounding frequency. The following table shows how your cumulative FD interest grows over a period, assuming there is no withdrawal during the period:

Year	Opening Amount (each quarter)	Interest @ 7% p.a.	Closing Amount (each quarter)
1	₹1,00,000	₹1,750	₹1,01,750
	₹1,01,750	₹1,780	₹1,03,530
	₹1,03,530	₹1,812	₹1,05,342
	₹1,05,342	₹1,843	₹1,07,185
2	₹1,07,185	₹1,876	₹1,09,061
	₹1,09,061	₹1,909	₹1,10,970
	₹1,10,970	₹1,942	₹1,12,912
	₹1,12,912	₹1,976	₹1,14,888
Total		₹14,888

(Please note: These are illustrative figures. Actual FD maturity depends on the bank, interest rate, compounding frequency and tenure.)

That means your estimated maturity amount at the end of two years is ₹1,14,888, and the total interest would be ₹14,888. If the same money was invested in an FD with interest payout, without the compounding effect, it would have earned you only ₹14,000.

The compounding effect is more significantly visible in an FD with a higher value and longer tenure.

How Frequently Is FD Interest Compounded?

This is where things get slightly more technical. Banks may compound FD interest at different frequencies (quarterly/annually) depending on the product and applicable terms. Quarterly compounding is common for many cumulative bank FDs, although the exact method can vary. Hence, it is important to check with your bank about the compounding frequency without assuming.

How Does FD Calculator Help?

Using an FD calculator can help you estimate the maturity amount and total interest you may earn based on the deposit amount, interest rate, tenure and applicable compounding frequency. Instead of manual calculation, using an online FD calculator can make it easier to compare different FDs before investing.

Tax Implications on Compound Interest in FD

Interest earned on a fixed deposit is generally taxable according to the applicable income-tax rules depending on which income tax bracket you fall into. The bank may also deduct Tax Deducted at Source (TDS) when the interest for the year crosses the threshold.

Hence, your headline FD interest rate is not necessarily the same as your post-tax return. For example, suppose your FD earns ₹50,000 in interest and you all into 30% income tax bracket; the actual benefit after applicable tax can be automatically lower. This is particularly important when comparing FDs with other investment or savings options.

Conclusion

The beauty of the compounding effect is not that it produces spectacular results overnight. The power lies in what happens quietly over time. The cycle of earning interest on interest continues throughout the FD tenure. The longer the money remains invested and the more frequently the interest compounds, the greater the potential effect. All this can depend on the bank’s terms and applicable interest rate.

Hence, it is crucial to check every aspect and not just the interest rate while choosing an FD. If your goal is to accumulate wealth and bring stability to your portfolio, a cumulative FD that offers the benefit of compounding would be a suitable option. You can compare fixed deposits from various institutions and banks on the JioFinance app. You can also earn JioPoints on booking an FD, which can be used to buy a voucher or brand coupons later.