Two lenders quote you a loan. One says 8% interest. The other says 14%. The first sounds far cheaper, and most borrowers stop comparing there. But if the first is a flat rate and the second is a reducing balance rate, the cheaper-looking option may actually cost you more. This is one of the most common mistakes borrowers make, and it is easy to avoid once you know what to look for.
What is a Flat Interest Rate?
Under a flat rate, interest is calculated on the original loan amount for the entire tenure. It does not matter how much you have already repaid.
If you borrow ₹2 lakh at a flat rate of 8% for 3 years, interest is charged on the full ₹2 lakh in year one, year two and year three, even though your outstanding balance is falling every month.
Total interest = ₹2,00,000 x 8% x 3 = ₹48,000. Your total repayment is ₹2,48,000, or about ₹6,889 a month.
What is a Reducing Balance Rate?
Under a reducing balance rate, interest is charged only on the amount still outstanding. As you repay principal each month, the interest portion of your EMI falls.
On the same ₹2 lakh borrowed for 3 years at a reducing balance rate of 14%, the EMI works out to approximately ₹6,836, and total interest is roughly ₹46,100.
So the loan quoted at 14% actually costs slightly less than the one quoted at 8%.
Why the Gap Is So Wide
The difference comes down to what the rate is applied to. A flat rate keeps charging you for money you have already returned.
As a rough guide, a flat rate is roughly equivalent to a reducing balance rate of nearly twice the number, depending on tenure. A flat rate of 8% behaves like a reducing balance rate somewhere in the region of 14% to 15% over three years.
The longer the tenure, the wider this gap becomes, because you spend more time paying interest on principal you no longer owe.
Where You Will See Each Type
Reducing balance is the standard for personal loans, home loans and most bank lending. If you personal loan apply online with a regulated lender, the rate quoted is generally on a reducing balance basis.
Flat rates appear more often in vehicle loans from certain financiers, consumer durable financing, some gold loan products and informal lending. They are also common in advertising, because the number looks smaller.
How to Spot Which One You Are Being Offered
Ask directly
The simplest approach. Ask the lender whether the quoted rate is flat or on a reducing balance, and get the answer in writing. Comparing the published personal loan rates across lenders first also tells you whether an unusually low quote is genuinely competitive or simply flat.
Check the total repayment amount
Ignore the rate for a moment and ask for the total amount you will repay over the full tenure. This single number makes comparison easy.
Ask for the APR
The annual percentage rate includes interest and fees, and is always expressed on a comparable basis. Regulated lenders are expected to disclose it.
Look at the amortisation schedule
Ask for the repayment schedule. Under a reducing balance loan, the interest portion of each instalment falls month after month. Under a flat rate, the interest portion stays the same throughout.
Why This Matters for Prepayment
On a reducing balance loan, part-prepayment directly reduces your outstanding principal, which cuts the interest you pay from that month onwards.
On a flat rate loan, the interest was calculated upfront on the original amount. Prepaying often saves far less than borrowers expect, and some agreements offer no interest rebate at all.
If there is any chance you will repay early, this difference alone should decide your choice.
A Quick Way to Compare Two Offers
Take both quotes and ask each lender for one number: the total amount repayable over the full tenure, including all fees and taxes.
Divide that figure by the number of instalments. Whichever offer gives the lower monthly outgo for the same loan amount and tenure is genuinely cheaper, regardless of which rate looked smaller in the advertisement.
Questions to Ask Before You Sign
- Is the quoted rate flat or reducing balance?
- What is the total amount I will repay over the full tenure?
- What is the APR, including all fees and taxes?
- What is the processing fee, and is it deducted from the disbursal?
- Can I part-prepay or foreclose, and what does that cost?
- Will I get a written amortisation schedule?
Conclusion
A lower advertised rate does not always mean a cheaper loan. Compare loans on the total repayment amount and the APR rather than on the headline number, and always confirm whether the rate is flat or on a reducing balance.
One question asked before signing can save you tens of thousands of rupees across the tenure. Ask it every time, and get the answer in writing.
Disclaimer: The figures used above are for illustration only. Interest rates, processing fees and eligibility criteria differ from lender to lender and are subject to change. Please check the applicable terms with the lender before applying.
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