Reducing Balance vs Flat Rate

By Pradipta Ray · Published 23 September 2026

Two lenders quote you 10%. One means 10% on what you still owe; the other means 10% on what you borrowed, every year, regardless of how much you have repaid. The second is close to twice as expensive.

This is the most expensive misunderstanding in Indian retail lending, and it is entirely about which balance the interest is charged on.

Reducing balance: interest is charged each month on the amount still outstanding. As you repay, the interest falls.
Flat rate: interest is charged on the original amount for the full tenure. Repaying makes no difference to the interest bill.

Compare a flat quote against a reducing-balance quoteFlat vs Reducing Rate Calculator

The same number, two very different loans

Take a five-lakh loan over five years, quoted at 10% under each structure.

₹5,00,000 over 5 years: a flat 10% quote against a reducing-balance 10% quote. The flat rate works out to 17.27% in reducing-balance terms.
Structure	EMI	Total interest	Total repayment
Flat 10%	₹12,500	₹2,50,000	₹7,50,000
Reducing 10%	₹10,624	₹1,37,403	₹6,37,403
Flat, in reducing terms	17.27%	-	-

₹5,00,000 over 5 years: a flat 10% quote against a reducing-balance 10% quote. The flat rate works out to 17.27% in reducing-balance terms.

The bottom row is the one that matters. To match what the flat quote actually charges, a reducing-balance lender would have to quote a rate close to double. That is the real comparison, and it is never the one printed on the poster.

Why the gap is so wide

By the middle of a five-year loan you have repaid roughly half the principal. Under a reducing balance, your interest has roughly halved with it. Under a flat rate you are still being charged on the entire original amount, including the half you have already returned.

The longer the tenure, the wider the gap, because there are more months in which you are paying interest on money you no longer have.

Where you will meet a flat rate

Banks quote reducing-balance rates on retail loans. Flat rates turn up elsewhere:

Two-wheeler finance arranged at the dealership.
Some consumer durable loans for appliances and electronics.
Certain gold loan schemes.
Much of the unorganised lending market, where the structure is rarely stated at all.

How to tell which one you are being offered

Ask directly, and then verify. Three checks settle it:

Ask whether interest is calculated on a reducing balance or a flat basis. Get the answer in writing.
Ask for the amortisation schedule. On a reducing-balance loan the interest column falls every month. On a flat-rate loan it is identical in every row.
Ask for the annual percentage rate or the effective rate. A lender quoting flat will usually have a much higher number here.

A flat rate is not automatically a bad deal - it is a bad deal when it is compared against a reducing rate as though the numbers mean the same thing. A flat 5% can genuinely beat a reducing 12%. Run both through the flat vs reducing calculator before deciding.

The short version

Never compare a flat rate to a reducing rate directly. Convert the flat quote into its reducing-balance equivalent first, then compare like with like. On most multi-year tenures, that conversion roughly doubles the number you were quoted.

Frequently asked questions

Is a flat rate always worse than a reducing rate?

No. It is worse at the same quoted percentage, which is the usual comparison. A sufficiently low flat rate can beat a high reducing rate - convert to the equivalent reducing rate and compare that.

Roughly how much does a flat rate cost in reducing terms?

On a multi-year tenure it tends to land close to double the quoted number, though the exact figure depends on the tenure. Use the calculator rather than the rule of thumb.

Do banks in India use flat rates?

Banks quote reducing-balance rates on retail loans. Flat rates are more common in dealership-arranged vehicle finance, some consumer durable loans and parts of the unorganised market.