Flat Interest Rate | Compare Interest Rates in India
When you take out a loan—whether for a car, personal need, or the latest must-have appliance—you will encounter a few different interest rate terms, including one of the more frequently discussed (and often misunderstood), Flat Interest Rates.
So, what is a Flat Interest Rate? How does it affect your monthly EMIs? And how do you go about comparing it with a few other different types of interest rates so you can choose the plan that will be the best for you financially?
Don’t worry! We’ve got you covered in this casual and straightforward guide.
What is a Flat Interest Rate?
A flat interest rate is a fixed rate charged on the entire original loan amount, regardless of how much you’ve repaid. It doesn’t reduce over time, which means you end up paying more interest compared to other methods.
In this instance, the interest rate or lending rate is fixed for the life of your loan and will be computed at the beginning of your loan term.
How It Works in Loans
Understanding how flat interest rates are calculated can help you figure out the total cost of your loan.
Here’s a simple formula for calculating interest under the flat rate method:
Flat Interest Rate Formula
The following formula is used to determine flat rates:
Flat interest rate = (P × R × T)
The loan principal, interest rate, and repayment period are denoted by P, R, and T, respectively, in the formula above.
Example Calculation
For instance, if your loan has a principal of Rs. 1,00,000 and you have three years to repay it at a 10% interest rate. So the calculation would go as such:
Loan Amount (P) = ₹1,00,000
Interest Rate (R) = 10%
Tenure (T) = 3 years
Interest = ₹1,00,000 × 10% × 3 = ₹30,000
Total Payable = ₹1,00,000 + ₹30,000 = ₹1,30,000
Monthly EMI = ₹1,30,000 / 36 months = ₹3,611
Answer: Rs. 3,611
Reducing Balance Rate
In a reducing balance rate, interest is calculated on the remaining loan amount after each EMI payment. So as you repay the loan, the interest portion gets smaller over time.
Calculation Formula
To calculate a reduced interest rate, you’ll need the EMI amount, which is determined as follows.
EMI = [P x Ix (1+I) ^T]/ [((1+I) ^T)-1)]
P is the principal amount, I is the interest rate divided by (100 × 12), and T is the number of years × 12 in the calculation above.
The following formula can be used to get the decreasing interest rate:
Reduced interest rate = Monthly EMI x T – P
Example Calculation
• Principal Amount – Rs. 5,00,000
• Interest Rate – 15%
• Repayment Period – 5 years
• (EMI) Rs. 11,895/- per month
In the first year, you pay a total EMI of ₹1,42,740—where ₹72,596 goes towards interest and ₹70,144 towards the principal repayment. Now, the interest rate is computed at 15% on the remaining principle amount, which is Rs. 4,37,404/-.
If you can pay bigger sums as part payments, you can use this strategy to lower your interest payments. This repayment strategy helps you reduce the total interest paid over the loan tenure, making your personal loan more cost-effective.
Also Read: How to Calculate Interest Rate for Loan
Flat Interest Rate vs Reducing Balance Rate
To truly assess the costs of borrowing, you must compare the flat rate with the reducing balance technique.
Flat Rate vs Effective Rate Comparison Table
FactorsReducing Balance Interest RateFlat Interest Rate
EMIRs 3,134Rs 3,444
Total Interest PayableRs 12,811Rs 24,000
Total PayableRs 1,12,811Rs 1,24,000
Which One Should You Choose?
If you prefer fixed EMIs and a simple structure, flat interest might work—but only if the rate is competitive. However, if you want to save on total interest, go for reducing balance.
Compare Flat Interest Rates in India – 2025
Let’s take a closer look at what India’s top lenders are offering in 2025 when it comes to flat interest rate loans.
• Bajaj Finserv
• Tata Capital
• HDFC Bank (select personal/car loans)
• TVS Credit
• Mahindra Finance
Interest Rate by Banks (2025)
BanksStarting Interest Rate (p.a.)
Kotak Mahindra Bank8.65% p.a. onwards
Union Bank of India7.85% p.a. onwards
Bank of Baroda8.00% p.a. to 9.50% p.a.
Central Bank of India7.85% p.a. onwards
Bank of India8.40% p.a. onwards
State Bank of India8.00% p.a. onwards
HDFC Home Loans8.50% p.a. onwards
LIC Housing Finance8.00% p.a. onwards
Axis Bank8.75% p.a. onwards
Canara Bank7.90% p.a. onwards
Where Are Flat Interest Rates Commonly Used?
Now that you know how flat interest works, where do you actually see it in action? Flat rates are often found in loans that are short-term or require predictable EMIs.
1. Personal Loans
You will often see flat interest rates in personal loans as well, particularly from NBFCs and digital lenders. Since the EMI is simple to follow, many borrowers like the convenience, even though they may pay more.
2. Car Loans
Some car loans may be flat rate deals, particularly from dealerships and loans secured with a non-bank financial institution. Even though the EMI sounds great, the effective rate could be higher than expected.
3. Consumer Durable Loans
Think of TVs, smartphones, or refrigerators. Many consumer durable loans will advertise “0% EMI”, typically means it is a flat rate loan with embedded hidden costs or fees.
4. Microfinance Loans
You will find that microfinance institutions often use flat interest rate calculations for small ticket loans to facilitate repayments for rural borrowers, despite substantially impacting the effective interest rate.
Factors Affecting Flat Rate Offers
• Credit Score: If you need better flat rates, you must have more than 750 credit scores.
• Lender Type: Consider NBFCs as they offer flat interest rates.
• Loan Amount: When it comes to flat rates, you may need smaller loan amounts.
• Processing Fees: With this loan, processing fees can lead to an increase in costs.
Tips for Choosing the Right Interest Rate Type
Choosing between flat and reducing balance interest can be tricky. Here are some tips to help you make the right choice.
1. Loan Tenure Consideration
If your loan tenure is short (1–2 years), flat rates may be acceptable. Over longer durations, the cost difference grows, making reducing balance more economical.
2. Loan Amount & Monthly EMI Planning
Flat rates keep EMIs predictable, which helps if you’re planning a tight monthly budget. But they might not be the cheapest option.
3. Effective Cost vs Simplicity
While flat rates look easy to calculate, they can be misleading because they don’t reflect the true cost of borrowing—always check the effective interest rate (EIR). Always ask for the effective interest rate (EIR) to know the real cost of borrowing.
Also Read: Lowest Home Loan Interest Rates in Mumbai 2024
Expert Opinion: When to Choose Flat Interest Rate Loans
Here are some situations where a flat interest rate loan might actually make sense.
1. For Short-Term Needs
If you’re borrowing for 12–18 months, the difference in total interest paid between flat and reducing balance may be small—making flat rate loans a viable option.
2. When EMIs Need to Stay Constant
Flat rate loans offer fixed EMIs, which is useful if you prefer budgeting with consistent monthly outflows.
3. If Reducing Balance Not Offered
Some microloans and retail loans don’t offer reducing balance rates at all. In such cases, comparing flat rate offers from different lenders is your best bet.
FAQs on Flat Interest Rate and Loan Comparisons
Q1. What is the difference between flat rate and interest rate? A flat interest rate is calculated on the full loan amount throughout the loan term, while a reducing interest rate is calculated on the outstanding loan balance. A flat rate pays interest on the original loan amount, even as repayments occur, resulting in higher total interest paid over the loan’s lifetime.
Q2. Which is better, flat or reducing interest rates? Reducing interest rates are generally better, especially for long-term loans, as you pay interest only on the outstanding balance, which lowers your total interest burden. Reducing balance interest is often more cost-effective for borrowers, especially for longer tenures or larger amounts. Flat rates are simpler but cost more over time.
Q3. Which type of interest is better? Floating or variable interest rates work well when market rates are falling, as your EMIs may reduce. But if rates rise, your payments can increase unexpectedly. However, if market conditions change to reflect rising interest rates, there is a chance that interest assessments may eventually be higher at increased rates.
Q4. Are floating rate loans risky? When interest rates fall, floating rates can save money; but, when they rise, they make budgeting and financial planning more difficult. In an era where interest rates are rising, fixed interest rates provide peace of mind and a set monthly payment.
Also read: Fixed vs Floating Interest Rate: Which is better on Home Loan?
Final Thoughts
• A flat interest rate means that you pay interest on the full principal meaning that monthly referenced EMIs are straightforward to work out, but you generally pay more over time.
• Flat interest rates are typically used in personal loans, car loans, consumer finance and microfinance.
• When borrowing small amounts for short durations with a flat rate, always compare the effective interest rate (EIR) and total repayment cost before deciding.
• When borrowing larger amounts of money for extended durations, consider reducing balance loans.
Getting a loan involves more than just taking advantage of the cheap interest rate; it also involves understanding how the interest rate is determined from the borrower’s perspective.
Even if you choose a flat interest rate because you want simplicity, you are likely best served on average when you are deliberate about shopping for multiple offers, reading the fine print and aligning a loan with your finance and borrowing goals.
Also read: Loan Against Property in Mumbai | Lowest Interest Rate