Fixed deposits remain a popular choice among people looking for relatively predictable returns on their savings. However, choosing an FD is not only about finding an attractive interest rate. Depositors also need to decide how they want to receive the interest earned on their money.

Banks generally offer different interest payout options. You may choose to receive interest periodically, such as every month, or allow the interest to remain invested until the FD matures. The second option is commonly known as a cumulative fixed deposit.

The choice can make a noticeable difference to your final returns because a cumulative FD allows compounding to work on the accumulated interest.

Consider an example of a ₹5 lakh FD for five years at an annual interest rate of 7.1%. How much could you receive if you take interest every month, and how does that compare with leaving the money invested until maturity?

Monthly Interest FD: How Much Income Could ₹5 Lakh Generate?

A monthly-interest FD is designed primarily for people who want regular cash flow from their investment.

According to the calculation provided in the source, a ₹5 lakh deposit earning 7.1% annually could provide approximately ₹2,958 per month under the monthly payout option.

Over five years, the total interest received would be approximately ₹1.77 lakh.

The original ₹5 lakh principal remains invested during the FD tenure and is returned when the deposit matures.

Therefore, the investor receives regular interest payments throughout the five-year period and gets the principal amount back at the end.

Why Doesn't Monthly Interest Get the Full Benefit of Compounding?

The key difference is what happens to the interest after it is earned.

Under the monthly payout option, interest is regularly transferred to the depositor instead of remaining inside the fixed deposit.

Because that money has already been paid out, it does not continue earning interest within the same FD.

This is why a monthly payout FD can be useful for generating income but may produce a lower total return than a cumulative deposit with the same principal, tenure and headline interest rate.

What Happens With a Cumulative Fixed Deposit?

A cumulative FD works differently.

Instead of paying interest to you every month, the interest remains invested. The accumulated interest can then earn additional interest in subsequent compounding periods.

This creates the effect commonly known as interest on interest.

Over longer periods, compounding can make a meaningful difference to the final maturity value.

₹5 Lakh Cumulative FD Could Grow to Around ₹7.11 Lakh

Using the example in the source, a ₹5 lakh cumulative FD at an assumed annual interest rate of 7.1% for five years could grow to approximately ₹7.11 lakh.

That means the total interest earned would be approximately ₹2.11 lakh.

Unlike the monthly payout option, you would not receive this interest regularly. Instead, the accumulated principal and interest would generally become available at maturity.

The source estimates a maturity value of around ₹7.11 lakh under these assumptions.

Monthly Interest vs Cumulative FD: ₹5 Lakh Example

Based on the source calculation, the cumulative FD generates approximately ₹33,000 more interest over five years.

It is important to understand that this does not mean the monthly payout option loses ₹1.77 lakh. That interest has already been paid to the investor over the five-year period. The ₹5 lakh shown at maturity represents the principal being returned.

Why Does the Cumulative FD Earn More?

The difference comes primarily from compounding.

Suppose interest earned during an earlier period remains invested instead of being withdrawn. During the next compounding period, interest can be calculated not only on the original principal but also on the accumulated interest, depending on the bank's compounding method.

The longer this process continues, the more noticeable the compounding effect can become.

This is why cumulative deposits are generally better suited to investors whose primary objective is building a larger maturity corpus rather than generating regular income.

Who May Prefer Monthly Interest?

A monthly-interest FD can be useful for someone who needs predictable cash flow.

For example, retirees who use interest income to meet household expenses may value regular payouts more than a larger maturity amount.

Similarly, someone who wants to supplement another source of monthly income may find the payout option convenient.

The principal remains invested during the tenure, while the interest provides periodic income.

Who May Consider a Cumulative FD?

A cumulative FD may be more suitable if you do not need regular income from the deposit and can leave the money untouched until maturity.

It allows the interest to remain invested and benefit from compounding.

This can be particularly relevant when the objective is saving toward a future expense rather than meeting current monthly needs.

Higher Maturity Value Does Not Automatically Mean the Better Choice

It can be tempting to look at the ₹33,000 difference and immediately conclude that the cumulative FD is always better.

The right choice depends on what you need from the investment.

If regular income is important, receiving approximately ₹2,958 every month could be more useful than waiting five years for a larger lump sum.

On the other hand, if you do not need periodic payouts, withdrawing the interest every month can reduce the compounding benefit available within the FD.

Taxes Can Change Your Effective Return

Another factor investors should consider is taxation.

Interest earned from fixed deposits is generally taxable according to applicable tax rules. Therefore, the amount you effectively retain can be lower than the headline return.

Tax treatment and applicable TDS provisions can also affect cash flows depending on the investor's circumstances.

For this reason, comparing FDs only on the advertised interest rate may not provide the complete picture.

Actual FD Returns Can Differ From This Example

The ₹7.11 lakh maturity figure used here is an illustration based on the assumptions provided in the source.

Actual returns can vary depending on the bank, exact interest rate, tenure, frequency of compounding, payout structure and terms of the fixed deposit.

Senior citizens may also be offered different FD interest rates by some banks, which can change the final calculation.

Which Option Should You Choose?

The decision ultimately comes down to income versus accumulation.

If your priority is receiving money regularly, a monthly-interest FD may be more appropriate. In the example above, it provides roughly ₹2,958 each month while preserving the ₹5 lakh principal until maturity.

If you do not require monthly income and your goal is to maximise the amount accumulated within the FD, the cumulative option can benefit from compounding and potentially provide a higher maturity value.

Before opening an FD, compare not only interest rates but also payout frequency, compounding terms, premature withdrawal rules and the tax impact on your returns.

Disclaimer: The calculations above are illustrative and based on the assumptions and figures provided in the source article. Actual FD returns may vary by bank, compounding frequency, interest rate, tenure and tax treatment. This article is for general information and does not constitute investment or tax advice.