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Home > Home Loan > Learn > Flat Interest Rate vs Reducing Interest Rate for Home Loans – Which One to Choose

Flat Interest Rate vs Reducing Interest Rate for Home Loans – Which One to Choose

April 8, 2025
Table of Contents

When taking a home loan, understanding flat vs reducing interest rates is crucial for making a cost-effective decision. A flat interest rate keeps your payments fixed, while a reducing rate lowers interest as you repay. Each method impacts your total repayment differently, making the right choice essential for saving money.

Let’s compare both to see which suits your needs best.

What is a Flat Rate of Interest?

A flat rate of interest is a method where the interest is calculated on the original loan amount throughout the tenure, regardless of how much has been repaid. This means your interest payments remain constant, making it easy to predict but often more expensive in the long run.

Borrowers using fixed installment loans may end up paying more compared to reducing balance methods. The method is very popular in regard to car loans, personal loans, and short-term financing.

Also Read: CRE Home Loan Interest Rates

What is Reducing Rate of Interest?

The reducing rate of interest is calculated on the outstanding loan balance, meaning interest decreases as you repay. This results in lower interest costs over time, making it more cost-effective than a flat rate.


Common in home and business loans, it helps borrowers save money while ensuring fairer repayment terms.

Also Read: Home Loan Options to Buy Independent House

Comparing Flat Vs Reducing Interest Rate

Choosing the right loan type is crucial for managing costs and financial commitments effectively.

According to the mentioned comparison table, a borrower can assess which option will suit their financial goals and repayment ability best.

FeatureFlat Rate InterestReducing Rate Interest
Total Interest PaidHigher, as principal remains unchangedLower, as interest reduces over time
CalculationInterest on full principal for entire tenureInterest recalculated on outstanding balance
EMI ImpactFixed EMI throughoutEMI decreases over time
Best ForAuto loans, personal loans, short-term financingHome loans, business loans, long-term financing

Read More: Home Loan EMI Calculator With Prepayment

How Does Flat Rate and Reducing Rate of Interest Works

When considering loan options, understanding how interest calculations affect your repayments is crucial. The difference between flat and reducing interest rates significantly impacts the total cost of your loan.

Flat Interest Rate:

In this method, interest gets computed on the whole principal amount for the entire duration of the borrowing period. This means your equated monthly installments (EMIs) remain constant, but you might end up paying more in interest over time.

For example, if you take a loan of ₹1,00,000 at a flat interest rate of 10% for 5 years, the interest is calculated on the full ₹1,00,000 for the entire period, leading to higher total interest paid.

Reducing Interest Rate

Here, interest is calculated on the outstanding loan balance, which decreases as you repay the principal. Consequently, your interest burden reduces over time, potentially resulting in lower total interest paid compared to a flat rate.

For instance, with the same loan parameters as above but under a reducing interest rate of 10%, the interest is recalculated on the decreasing principal, leading to overall savings.

Which One is More Beneficial?

  • Flat rate loans suit short-term financing with predictable EMIs.
  • Reducing rate loans are more cost-effective for long-term commitments.

You may make an informed choice that supports your financial objectives by being aware of the subtle differences between flat vs. lowering interest rates.

Check Out: Convert Flat to Reducing Balance Interest Rate

Case Study of Flat vs. Reducing with an Example

When evaluating loan options, it’s essential to understand how different interest calculation methods impact your total repayment. Let’s explore a practical case study comparing flat and reducing interest rates.

Example: You take a loan of ₹5,00,000 for a tenure of 3 years at an annual interest rate of 10%.

Flat Interest Rate Calculation:

Interest Calculation: Interest is computed on the entire principal amount throughout the loan tenure.

Total Interest: ₹5,00,000 × 10% × 3 = ₹1,50,000

Total Repayment: Principal + Total Interest = ₹5,00,000 + ₹1,50,000 = ₹6,50,000

Monthly EMI: ₹6,50,000 ÷ 36 months ≈ ₹18,056

Reducing Interest Rate Calculation:

Interest Calculation: Interest is calculated on the outstanding loan balance, which decreases as you repay.

Monthly EMI: Using the reducing balance method, the EMI can be calculated using the formula:

EMI = [P × r × (1 + r)^n] / [(1 + r)^n – 1]

Where:

P = Principal loan amount

r = Monthly interest rate (annual rate ÷ 12)

n = Total number of EMIs

Plugging in the values:

P = ₹5,00,000

r = 10% ÷ 12 = 0.00833

n = 36

EMI ≈ ₹16,134

Total Repayment: ₹16,134 × 36 ≈ ₹5,80,824

Total Interest: ₹5,80,824 – ₹5,00,000 ≈ ₹80,824

Comparison:

Total Interest Paid:

  • Flat Rate: ₹1,50,000
  • Reducing Rate: ₹80,824

Monthly EMI:

  • Flat Rate: ₹18,056
  • Reducing Rate: ₹16,134

The reducing interest rate method lowers total interest and EMIs compared to the flat rate, making it essential to understand for informed financial decisions.

Source: Understanding the Calculation of Flat vs Reducing Rate by Economic Times

Conclusion

Choosing between flat and reduced interest rates depends on your loan type and financial goals. While flat rates keep EMIs predictable but costlier, reducing rates helps save on interest over time.

Credit Dharma simplifies the home loan process, ensuring you choose the most cost-effective option for your borrowing needs.

Frequently Asked Questions

Is flat or reducing loan better?

A reducing interest loan is generally better for long-term borrowing as it lowers interest costs over time. Flat-rate loans are simpler but often costlier. The best choice depends on your financial goals, loan tenure, and repayment capacity.

How to convert flat rate to reducing rate?

You can’t directly convert a flat rate loan to a reducing rate loan. However, refinancing with a lender offering reducing interest rates can help. Use a loan calculator to compare both methods and determine potential savings before switching.

What is the difference between flat rate and reducing balance?

A flat rate calculates interest on the full principal amount throughout the tenure, while a reducing balance method recalculates interest on the outstanding loan amount, decreasing over time. Reducing balance loans usually result in lower total interest payments.

What is the benefit of a flat rate?

Flat rate loans offer predictable EMIs, making budgeting easier. They are commonly used for short-term loans, such as personal or auto loans. However, they usually result in higher interest payments compared to reducing balance loans over time.

How can I know my EMI before taking the loan?

You can calculate your EMI using an online loan calculator by entering the principal amount, interest rate, and tenure. Many banks and financial institutions also provide EMI calculators to help borrowers estimate monthly payments before applying.

How to secure the lowest interest rate on a loan?

To get the lowest interest rate, maintain a high credit score, compare multiple lenders, opt for a shorter tenure, and negotiate with banks. Additionally, securing loans against collateral or choosing government-backed loan schemes can help reduce interest rates.

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