A ₹5 lakh loan at a flat 8% for 3 years. What is the real yearly rate?
14.55%a year on a reducing balance
- EMI
- ₹17,222
- Total interest
- ₹1,20,000
- Total you repay
- ₹6,20,000
A reducing rate is better for the borrower. A flat rate charges interest on the full loan for the whole term, even after you have repaid most of it; a reducing rate charges only on what you still owe. So a flat rate costs about 1.7 to 1.8 times the same number on a reducing balance: a flat 8% for 3 years is really about 14.55%.
Try your own numbers- Flat rate: interest on the original loan for every year of the term, even as you repay.
- Reducing rate: interest only on what you still owe, so it falls every month.
- A flat rate is about 1.7 to 1.8 times its reducing equal: flat 10% for 3 years ≈ 17.92%.
- Compare loans by the APR on the Key Facts Statement, or by EMI and total interest, never by the quoted number alone.
Two loan offers sit on your table. A bank says 11%. A finance company or a showroom says 8%. The smaller number looks like the obvious choice, and that is exactly why some lenders quote it. One of these is a flat rate and the other a reducing rate, and the 8% turns out to be the dearer loan.
This guide explains flat vs reducing interest rate in plain words, shows which is better, how to convert a flat rate to a reducing rate, and what to ask before you sign. The converter beside the guide follows along: each part switches it to that part’s example, and you can type your own offer at any time.
What is a flat interest rate?
A flat rate charges interest on the original loan amount for the entire term. It does not matter that you repay part of the loan with every EMI; the interest is worked out as if you still owed all of it until the last month.
The flat rate formula is simple:
Total interest = loan × flat rate × years
On ₹5 lakh at a flat 10% for 3 years, that is ₹5,00,000 × 10% × 3 = ₹1,50,000. Add the loan, divide by 36 months, and the EMI is ₹18,056. By the last year you owe very little, but you are still paying interest on the full ₹5 lakh.
What is a reducing balance interest rate?
A reducing (or diminishing) balance rate charges interest only on what you still owe. Every EMI pays that month’s interest and cuts the loan, so next month’s interest is a little smaller. Banks quote home, car and most personal loans this way, and the standard EMI formula works on it. Our guide what is EMI shows how each EMI splits.
On ₹5 lakh at 11% reducing for 3 years, the EMI is ₹16,369 and the total interest ₹89,297. Expressed the flat way, 11% reducing is only about 5.95% flat.
Flat vs reducing interest rate: which is better?
For the borrower, reducing is better. The same number costs far less on a reducing balance, and a lower flat number often costs more than a higher reducing one.
Prakash repairs mobile phones in Madurai and needs ₹5 lakh for 3 years to open a second shop. A finance company offers a flat 8%; his bank offers 11% reducing.
| Offer for ₹5 lakh, 3 years | EMI | Total interest | Real yearly rate |
|---|---|---|---|
| Finance company, flat 8% | ₹17,222 | ₹1,20,000 | 14.55% |
| Bank, 11% reducing | ₹16,369 | ₹89,297 | 11% |
The “cheaper” 8% is really 14.55% a year. The bank’s offer is ₹853 a month lower and saves Prakash ₹30,703 of interest over the loan.
A flat rate charges you interest on money you have already paid back.
How to convert flat rate to reducing rate
There is no neat formula for the conversion. The converter works out the flat EMI, then finds the reducing rate that gives the same EMI on the same loan; that is the real yearly rate. For terms of 1 to 5 years, it comes out at roughly 1.7 to 1.8 times the flat rate:
| Flat 10% on ₹5 lakh for | EMI | Real reducing rate |
|---|---|---|
| 1 year | ₹45,833 | 17.97% |
| 2 years | ₹25,000 | 18.16% |
| 3 years | ₹18,056 | 17.92% |
| 5 years | ₹12,500 | 17.27% |
So a quick check in a showroom: multiply the flat rate by about 1.8. A flat 9% two-wheeler loan of ₹1 lakh for 2 years works out to about 16.43%. For the exact figure, type the offer into the flat vs reducing rate converter.
Going the other way, reducing rate to flat rate, pick A reducing rate in the converter. If a lender only tells you the EMI, pick My EMI: an EMI of ₹18,056 on ₹5 lakh for 3 years means a real rate of 17.92%, the same as a flat 10%.
A flat rate is not illegal, but comparing a flat number with a reducing number is comparing two different things. Convert first, then compare.
Where flat rates show up, and what to ask
Flat rates appear most often in car and two-wheeler dealer finance, consumer durable loans for phones, TVs and fridges, some NBFC personal loans and local lenders who quote interest per month. A “2 rupees interest” a month on every ₹100 is 24% a year before you even ask whether it is flat.
Before you sign, ask four things:
- “Is this rate flat or on a reducing balance?”
- “What is the APR in the Key Facts Statement?”
- “What is the EMI and the total amount I will repay?”
- “What are the processing fee and the charge for closing early?”
Fees and the APR
Since 1 October 2024, RBI requires banks and NBFCs to give every new retail borrower a Key Facts Statement showing the APR, the annual percentage rate. It counts the processing fee and other charges along with the interest, so it is the fairest single number for comparing loans. NBFCs have also long been required to state the annualised rate and how it is applied in the sanction terms.
Add a ₹5,000 fee (₹5,900 with GST) to Prakash’s flat 8% offer and the APR rises from 14.55% to 15.39%. Turn on Fees in the converter to see your own.
If you already have a flat-rate loan, moving it to a cheaper reducing-rate loan can save money, but check the closing charge first. RBI’s 2025 rules stop prepayment charges only on floating-rate loans to individuals; flat-rate loans are usually fixed, so a charge may apply.
Questions
What is the difference between flat rate and reducing rate?
A flat rate charges interest on the original loan for the whole term. A reducing rate charges interest only on the amount still owed, so the interest falls as you repay. The same number therefore costs much more as a flat rate.
Which is better, flat or reducing interest rate?
Reducing is better for the borrower. A flat 8% for 3 years costs about the same as 14.55% reducing, so an 11% reducing loan is cheaper than a flat 8% one.
How do I convert a flat rate to a reducing rate?
Work out the flat EMI (loan plus loan × rate × years, divided by the months), then find the reducing rate that gives the same EMI. As a rough check, multiply the flat rate by about 1.8 for terms of 1 to 5 years; the converter gives the exact figure.
What is the flat rate formula?
Total interest = loan × flat rate × number of years. The EMI is the loan plus that interest, divided by the number of months.
Is a flat interest rate good for a personal loan?
Usually not. A flat rate hides a real cost close to double the quoted number. Compare any flat-rate personal loan with a bank’s reducing-rate offer using the APR or the total interest.
Does a reducing rate always mean a lower EMI?
Not always. A longer term or a higher reducing rate can still give a higher EMI. Compare offers for the same amount and term, and look at the total interest and the APR together.
Why do lenders quote flat rates?
A flat number looks smaller than the reducing rate it equals, which makes the loan seem cheaper in a showroom. It is also simpler to work out by hand. The APR on the Key Facts Statement shows the real cost either way.
Sources
Checked 18 Oct 2026RBIKey Facts Statement (KFS) for Loans & Advances (RBI/2024-25/18) · Reserve Bank of India2024
Banks and NBFCs must show the APR, the all-in yearly cost of a loan, in a Key Facts Statement for retail loans sanctioned from 1 October 2024. 15 Apr 2024
RBIMaster Circular: Fair Practices Code (RBI/2015-16/16) · Reserve Bank of India2015
NBFCs must give the sanction terms in writing, including the annualised rate of interest and how it is applied. 1 Jul 2015
SMFGDifference between reducing balance and flat rate interest · SMFG India Credit (a lender’s explainer)2026
How the two methods are worked out; a secondary explainer from a lender, used only for the method. checked 18 Oct 2026
Founder of Elathi, Kallakurichi. Writes our guides and builds the free tools that go with them.