Flat Interest Rate Vs Reducing Rate

When taking a loan, lenders calculate interest using two main methods: flat interest rate and reducing interest rate. Understanding flat vs reducing interest rate is essential, as the method you choose affects the total interest you will pay over the loan tenure
 

Flat interest rate:
In the flat interest rate method, interest is calculated on the entire principal amount for the entire loan tenure, regardless of the repayments made. For example, if you borrow Rs. 1 lakh at a flat rate of 10% for three years, interest is calculated on Rs. 1 lakh throughout, which results in higher overall interest costs compared to the reducing rate method.
 

Reducing interest rate:
With the reducing rate of interest method, interest is calculated on the outstanding loan balance after each repayment. As you pay EMIs, the principal reduces, and so does the interest. For instance, a reducing rate of 10% on Rs. 1 lakh over three years will lead to lower total interest payments than a flat rate, making it a more cost-effective option.

Before applying for a loan, it is important to understand the differences between these two methods. Choosing the right interest calculation—flat or reducing—can help you manage your finances better and save significantly on interest over time.

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A flat interest rate is calculated on the original loan amount for the entire tenure of the loan. Under this method, the interest rate remains fixed, and interest is calculated on the full principal, regardless of the repayments made during the loan period.

Flat interest rate formula

Interest under the flat rate method is calculated using the following formula:

Total Interest = (P × R × T) / 100

Where:

• P is the principal amount
• R represents the annual interest rate (in percentage)
• T is the loan tenure (in years)

A flat interest rate remains constant throughout the loan tenure, making it predictable and easy to calculate. Borrowers know their exact repayment amount, ensuring better financial planning. Unlike reducing rates, the interest does not decrease over time.

Key benefits:

• Fixed EMI amount throughout the loan tenure.
• Simple and easy-to-understand loan calculation.
• Suitable for short-term loans with quick repayments.
• Provides financial stability with consistent payments.

The reducing interest rate is calculated on the diminishing principal amount. Every month when you pay your EMI, your principal loan amount decreases. And, when you opt for the reduced interest rate, the interest will be calculated only on the reduced principal amount at the time of EMI payment.

Each EMI you pay comprises an interest and principal component. Therefore each EMI paid lowers the outstanding principal balance. In this method, the interest calculation depends on the outstanding loan amount. Interest is calculated only on the outstanding principal liability and not the total principal borrowed.

Also, effective lending rates are taken into account. For better planning of your loan repayment journey, we suggest you use a personal loan EMI calculator and know your monthly EMIs in advance.

A reducing interest rate is calculated on the outstanding loan balance after each EMI payment. This means the interest amount decreases over time as the principal gets repaid. The interest for each instalment is calculated using the following formula:

Interest for each instalment = Outstanding loan amount × interest rate applicable for the period

Compared to a flat interest rate, a reducing interest rate usually results in lower total interest payable over the loan tenure. Understanding both calculation methods helps borrowers make informed decisions when comparing flat and reducing personal loan interest rates.
 

Read more: What is interest rate and how does it work?

In a reducing interest rate system, interest is calculated on the outstanding principal, decreasing over time. This results in lower interest payments compared to a flat rate, making it cost-effective for long-term loans.

Key benefits:

• Lower total interest payout over the loan tenure.
• Reduces financial burden as principal decreases.
• More cost-effective for long-term loans.
• Encourages early repayment to save on interest.

1. Basis of calculation

Under a flat lending rate, interest is calculated on the total principal amount sanctioned, whereas interest accrual under a diminishing rate is based on the outstanding loan amount.

2. Effective interest rate equivalence

Fixed-rate calculations result in a higher effective interest rate equivalence. On the other hand, reducing rate calculation reflects the effective interest rate initially.

3. Rate comparison

Under the flat rate calculation method, interest rates are usually fixed at a lower percentage than diminishing interest rates.

4. Simplicity of calculation

Interest calculations under a flat rate are more straightforward than the reducing interest calculations.

These points of difference between flat and reducing interest rates outline how they can impact a borrower’s finances.

Now that you know how interest rate calculation can impact your finances, check the method of calculation with your lender before availing of a personal loan.

Which is better flat or reducing interest rate?

Choosing between a flat interest rate vs reducing interest rate depends on your financial goals and preferences. A flat interest rate stays fixed throughout the loan tenure, offering predictable monthly payments. On the other hand, a reducing interest rate decreases as your outstanding loan balance reduces, which can save you money over time. Assess your financial situation, repayment capacity, and long-term costs to decide which option suits you best.

Read more: Fixed vs floating interest rate