“12%” looks like a precise figure, but on its own it doesn’t tell you what a loan costs. The missing word is the method used to calculate the interest.
For a first-time borrower, this is one of the easiest traps to fall into and also one of the easiest to avoid, because all it takes is a single question: “Is that flat or reducing?”
Same loan, two calculations
For example, take a loan of â‚ą1,00,000, repaid over 24 months, with a rate of 12% a year.
Flat method. Interest is 12% of â‚ą1,00,000 for each of two years:
â‚ą1,00,000 Ă— 12% Ă— 2 = â‚ą24,000 of interest (â‚ą1,00,000 + â‚ą24,000) Ă· 24 = EMI of about â‚ą5,167
Reducing method. Each month, interest is 1% (12% Ă· 12) of the balance still outstanding. A standard EMI calculator gives an EMI of about â‚ą4,707 and total interest of about â‚ą12,976.
The flat-rate borrower pays about â‚ą460 more every month and about â‚ą11,000 more over the loan, on what sounded like the same rate.
Watch the first three months
The gap comes from how the interest charge behaves as the debt shrinks.
| Month | Balance before EMI (reducing) | Interest (reducing) | Interest (flat) |
|---|---|---|---|
| 1 | â‚ą1,00,000 | â‚ą1,000 | â‚ą1,000 |
| 2 | â‚ą96,293 | â‚ą963 | â‚ą1,000 |
| 3 | â‚ą92,548 | â‚ą925 | â‚ą1,000 |
| 24 | about â‚ą4,661 | â‚ą47 | â‚ą1,000 |
In the last month of the flat loan, you are still paying ₹1,000 of interest, on a debt that has almost gone. Under the reducing method, the same month’s interest is about ₹47.
What a flat rate is really equal to
Take the flat EMI of â‚ą5,167 and ask which reducing rate gives that same EMI on â‚ą1,00,000 over 24 months. The answer is about 21.6% a year.
The conversion depends on the term, so there is no single multiplier. Two illustrations:
| Flat rate quoted | Loan and term | EMI | Equivalent reducing rate |
|---|---|---|---|
| 12% | â‚ą1,00,000 for 24 months | about â‚ą5,167 | about 21.6% |
| 10% | â‚ą2,00,000 for 36 months | about â‚ą7,222 | about 17.9% |
Neither figure includes fees. Add a processing fee, and the true annual cost rises further. That is what the APR is designed to capture.
Where you might meet a flat rate
You may see flat rates quoted in loan-related sales conversations, instalment plans and shop finance offers. Not every lender uses them, and the name isn’t always obvious. Terms like “add-on rate” or “only ₹1 interest per ₹100 per month” can point in the same direction. A phrase like that describes 12% flat, not 12% reducing, if it is charged on the original amount each month.
A flat quote on its own isn’t proof that something is wrong. The point is simply that you can’t compare it directly with a reducing rate.
Four steps to compare any two offers
- Ask the method. Get “flat” or “reducing” in writing. If a salesperson can’t answer, treat that as useful information.
- Get the EMI, term and amount received. These three numbers don’t depend on how the rate is described.
- Multiply. EMI Ă— number of months, minus the amount you actually receive, is your total cost of borrowing.
- Read the Key Facts Statement. As of November 2026, RBI rules require lenders to give one for retail term loans, including an APR calculation and a repayment schedule. The APR gives you one common measure across different calculation methods.
For example, a â‚ą1,00,000 offer at 11% flat for 24 months has an EMI of â‚ą5,083 (â‚ą1,22,000 Ă· 24). A reducing-rate offer at 14% for the same amount and term has an EMI of about â‚ą4,801. The lower-sounding number is the more expensive loan.
Two related misunderstandings
“My EMI is the same under both, so the method doesn’t matter.” If the EMIs and fees really are identical, the cost is too. But they rarely are when the rate is the same, and that is exactly the point of checking. Fees and early-closure terms can still differ, so read those too.
“Reducing means my EMI goes down.” Usually not. In a standard loan the EMI stays level. What falls each month is the interest portion, while the principal portion grows. Floating-rate loans are a separate matter, as the rate itself can change: see fixed vs floating home loans.
“No-cost” offers deserve the same scrutiny, since interest can be built in another way. Our no-cost EMI guide explains how they work. Before you commit to anything, also confirm the app or agent is genuine, and never share an OTP, PIN or card details to get a loan quote.
Bottom line
Never compare a flat rate and a reducing rate as if they were the same number. Ask for the method, the EMI and the APR, then work out what you will repay in rupees. Check the current terms with the lender before you sign, because the figure that matters is the total you pay, not the rate in the advert.
Frequently asked questions
Is a flat rate of interest always worse than a reducing rate?
Not at the same number. If both are quoted at 12%, the flat rate costs much more. But a lower flat rate can sometimes match a higher reducing rate, so convert both to an APR before you decide.
How do I convert a flat rate to a reducing rate?
Work out the EMI from the flat rate, then find the reducing rate that gives the same EMI. Any online EMI calculator or a spreadsheet's RATE function can do this. For a loan with fees, the APR in the Key Facts Statement is the better figure to compare.
Does paying off a flat-rate loan early save the same amount of interest?
It may not. Some flat-rate agreements work out early closure differently, and a charge may apply. Ask the lender for a written foreclosure statement before you decide, and check the loan agreement.
