Guide
Flat rate versus reducing balance: the same number, twice the cost
Flat-rate interest is charged on the original amount for the whole tenure. Reducing-balance interest is charged only on what you still owe. The same quoted percentage produces very different costs.
5 min read · Reviewed 1 September 2026
How each is computed
Flat: interest = principal × annual rate × years, and the instalment is (principal + that interest) ÷ months. Your repayments never reduce the base on which interest is charged.
Reducing balance: interest each month = outstanding balance × monthly rate. As the balance falls, the interest portion falls with it. This is what banks and NBFCs use for home, car, personal and most business loans.
The same loan, both ways
The flat version costs about ₹1,12,600 more on the same borrowing. As a rough rule, a flat rate is close to 1.75–1.9 times the equivalent reducing-balance rate over a typical tenure — so a 10% flat quote behaves like roughly 17–18% reducing.
| Method | Instalment | Total interest |
|---|---|---|
| Flat 10% | ₹12,500 | ₹2,50,000 |
| Reducing balance 10% | ₹10,624 | ₹1,37,411 |
Where flat rates still show up
- Consumer durable and no-cost EMI schemes at retail counters.
- Some dealer-arranged two-wheeler and used-car finance.
- Small-ticket informal or unregulated lending.
- Certain business and equipment loans quoted as a monthly percentage.
Questions to ask before signing
- Is the quoted rate flat or reducing balance? Ask for it in writing.
- What is the annual percentage rate including fees? Regulated lenders must disclose it in the Key Fact Statement.
- What is the total amount payable over the tenure? One number settles most arguments.
- Does prepaying reduce interest at all? On a flat loan it usually does not, which is a strong reason to avoid it.
Comparing a flat quote fairly
Work out the total amount payable under the flat quote, then use the EMI calculator to find the reducing-balance rate that produces the same total. Compare that number with the other offers on your table — not the headline percentage.
Frequently asked questions
- Is no-cost EMI really free?
- Usually the interest is converted into an upfront discount that you forgo, or into a processing fee. Ask for the cash price without EMI and compare; the gap is the real financing cost.
- Can I convert a flat loan to reducing balance?
- Not with the same lender mid-tenure. The practical route is to refinance the outstanding amount with a lender that charges reducing-balance interest, after checking the foreclosure cost.
Last reviewed: 1 September 2026
ByeToEMI provides indicative calculations for educational and planning purposes. Actual lender calculations, charges, interest-rate changes and repayment schedules may differ. ByeToEMI is not a lender, loan broker or financial advisor.