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How to Calculate the Interest Rate On Your Fixed Deposit Account

If you have settled for a fixed deposit account as your next investment pathway, you should know how to calculate the interest rate.

A fixed deposit account, also known as a term deposit or time deposit, is a type of savings account that banks and financial institutions offer customers.

Fixed deposit accounts are known to offer stability and predictable returns as you know the exact amount you will earn at maturity. They are also suitable for individuals who have a specific savings goal and do not need immediate access to the funds.

How does a fixed deposit account work?

It's important to note that once you open a fixed deposit account, you generally cannot withdraw the funds before the maturity date without incurring penalties or losing the interest earned. This lack of liquidity is a characteristic of fixed deposit accounts.

Other ways a fixed deposit account works include.


You deposit a certain amount of money into the fixed deposit account. The minimum deposit requirement varies depending on the bank or financial institution.


You choose a specific period, known as the tenure or term, for which you want to keep the money in the fixed deposit account. The tenure can range from a few months to several years, depending on the options provided by the bank.

Interest rate

The bank offers you an agreed-upon interest rate for the duration of the fixed deposit account. This interest rate is typically higher than the interest rate offered on regular savings accounts. The interest rate may be fixed for the entire tenure or variable, depending on the terms set by the bank.


At the end of the tenure, the fixed deposit account reaches maturity. The original principal amount you deposited, along with the interest earned, becomes available for withdrawal.

Withdrawal Options

You have several options when the fixed deposit account matures:

You can choose to withdraw the entire amount, that is the principal and interest from the account.

Or you can renew the fixed deposit account for another term with the accrued interest. This allows you to continue earning interest on your investment.

You are also given a partial withdrawal while keeping the remaining amount as a new fixed deposit for the remaining tenure.

Advantages of fixed deposits

Fixed deposits (FDs) offer several advantages as an investment option. Here are some of the key advantages of fixed deposits:


Investors generally consider fixed deposits as safe investments. The Nigerian Deposit Insurance Corporation (NDIC) typically protects the principal amount invested in an FD up to a certain limit.

Guaranteed Returns

FDs offer a fixed interest rate for a predetermined period. This ensures that the investor will receive a guaranteed return on their investment. Investors know the interest rate at the time of investment, which provides certainty and predictability of returns.

Low Risk

FDs are considered low-risk investments. The principal amount invested is not subject to market fluctuations or volatility, providing stability to the investment. The fixed nature of FDs reduces the risk associated with market fluctuations, making them suitable for risk-averse investors.

Capital Preservation

Fixed deposits are ideal for individuals who prioritize capital preservation. The invested amount is protected, and the returns are assured, ensuring that the principal amount remains intact. This makes FDs a reliable option for safeguarding savings or meeting short-term financial goals.

Income Generation

Fixed deposits can serve as a source of regular income. The payout frequency for the interest earned on FDs depends on the investor's choice and can be periodic, such as monthly, quarterly, or annually. This can be beneficial for individuals who require a steady stream of income.

Tax planning

Investors can utilize fixed deposits for tax planning purposes. In certain countries, the interest earned on FDs may qualify for tax deductions or exemptions up to a specific limit. By strategically investing in FDs, individuals can optimize their tax liabilities and potentially reduce their tax burden.

Loan Collateral

Investors can use fixed deposits as collateral to secure loans. Banks and financial institutions often provide loans against the value of the FD, allowing individuals to access funds while still earning interest on the deposit.

Fees or charges that may apply to fixed deposits.

Fees or charges associated with fixed deposits can vary depending on the bank or financial institution offering the deposit. Here are some common fees or charges that may apply to fixed deposits:

Premature withdrawal penalty

If you decide to withdraw your fixed deposit before the maturity date, the bank may impose a penalty or charge a fee. The penalty amount is usually a percentage of the interest earned or a predetermined fee. The purpose of this penalty is to discourage early withdrawals and compensate the bank for the inconvenience caused.

Renewal or roll over fees

Some banks may charge a fee if you choose to renew or roll over your fixed deposit for another term after its maturity. The fee for this service may vary among institutions and can either be deducted from the interest earned or added to the principal amount.

Service charges

Some banks may levy service charges for managing fixed deposit accounts. These charges can include administrative fees, account maintenance fees, or transaction fees. It's important to review the terms and conditions provided by the bank to understand the specific service charges associated with the fixed deposit account.

Tax deductions at source (TDS)

Depending on the tax regulations in your country, the bank may deduct tax at source from the interest earned on your fixed deposit. The tax authorities typically remit the deducted amount on your behalf as the rate of TDS (Tax Deducted at Source) can vary. However, you may be able to claim a refund or adjust the tax liability during your income tax filing, depending on your overall tax situation.

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Types of fixed deposit accounts

There are several types of fixed deposit accounts available, each with its own features and benefits.

It's important to note that the availability of these types of fixed deposit accounts may vary depending on the banks. The features, interest rates, and terms and conditions of these accounts can also differ.

Here are some common types of fixed deposit accounts:

1. Regular Fixed Deposit

This is the standard type of fixed deposit account where you deposit a lump sum amount for a fixed period at a fixed interest rate. The interest rate remains constant throughout the tenure, providing predictable returns.

2. Senior Citizen Fixed Deposit

This type of fixed deposit is exclusively available to senior citizens (usually individuals aged 60 years and above). It offers higher interest rates compared to regular fixed deposits, providing additional income for retirees.

3. Tax-saving Fixed Deposit

Some countries offer specifically designed fixed deposits that provide tax benefits. These deposits typically have a lock-in period, usually ranging from 5 to 10 years, and the applicable tax laws may allow for tax deductions on the interest earned.

4. Flexi Fixed Deposit

Flexi fixed deposits allow depositors to withdraw funds from their fixed deposit account without breaking the entire deposit. It offers flexibility by providing a pre-approved credit limit against the fixed deposit, allowing individuals to meet their urgent financial requirements while still earning interest on the remaining deposit amount.

5. Monthly Income Fixed Deposit

Also known as Monthly Interest Scheme (MIS), this type of fixed deposit pays out interest at regular intervals (typically monthly) rather than at the end of the tenure. It can be beneficial for individuals seeking a steady stream of income from their fixed deposit investments.

6. Cumulative Fixed Deposit

In a cumulative fixed deposit, the interest earned is compounded and reinvested with the principal amount. The entire maturity amount (principal plus interest) is paid out at the end of the tenure. This type of fixed deposit is suitable for individuals who do not require periodic interest payments and want to maximize their returns over the long term.

Calculating the interest rate on your fixed deposit account

To calculate the interest rate on a fixed deposit account, you typically need the following information:

Principal Amount

This refers to the initial amount of money you deposit into the fixed deposit account.

Interest Rate

This is the annual interest rate offered by the bank or financial institution where you have a fixed deposit account.

Time Period

The duration for which you will keep the money in the fixed deposit account is typically measured in years or months.

The formula to calculate the interest earned on a fixed deposit account is:

Interest Earned = Principal Amount × Interest Rate × Time Period

Here's an example to illustrate the calculation:

Let's say you deposit N10,000 into a fixed deposit account with an annual interest rate of 5% for a duration of two years.

Principal Amount = N10,000

Interest Rate = 5% (expressed as 0.05)

Time Period = Two years

Interest Earned = N10,000 × 0.05 × 2 = N1,000

Therefore, in this example, you would earn N1,000 as interest over the 2-year duration of the fixed deposit account.

Note that different banks or financial institutions may have variations in their interest calculation methods.

Some institutions compound the interest annually, quarterly, or monthly, while others may use a different formula altogether. It's always a good idea to check with your specific bank or financial institution for their precise calculation method.

nairaCompare has a wide pool of fixed deposits and other kinds of savings accounts for you to choose from. Visit nairaCompare to compare fixed deposits and select the one that’s best for you!

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