Flat vs Reducing Rate Converter
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How it works
A flat rate charges interest on the full principal for the entire tenure — even in the last month, when you owe almost nothing. A reducing-balance rate charges only on what you still owe. Same EMI, wildly different cost.
The gap is brutal: 12% flat ≈ 21% reducing on a 3-year loan. Dealers and NBFCs quote flat precisely because it sounds cheap — a "10% flat" two-wheeler loan is really ~17.5%.
Always convert, then compare. Bank personal loans (11–14% reducing) routinely beat "9% flat" dealer finance once you see the true number.
Frequently asked questions
What is a flat interest rate?
Interest calculated on the original principal for the whole tenure, regardless of repayments. EMI = principal × (1 + flat rate × years) ÷ months. Common in dealer and two-wheeler finance.
Why is flat rate misleading?
Because you keep paying interest on money you already repaid. In the final year of a 3-year loan you owe little but still pay interest on the full original amount.
What is the quick conversion rule?
Reducing ≈ flat × 1.8 for 2–5 year tenures. So 10% flat ≈ 18% reducing, 12% flat ≈ 21.6% reducing. This calculator gives the exact figure.
Which loans use flat rates?
Two-wheeler loans, consumer durable loans, many dealer-arranged car loans, and some NBFC personal loans. Banks typically quote reducing balance — which is why bank quotes look "higher" but cost less.
Can I negotiate flat to reducing?
Ask the lender to quote the reducing-balance equivalent — RBI-aligned lenders will. If they refuse, convert it yourself here and walk away if the true rate is poor.
Does tenure change the conversion?
Yes — longer tenures widen the gap slightly because more interest accrues on the "phantom" repaid principal. Enter your exact tenure above.
Is 0% finance really 0%?
Rarely — the "interest" is usually baked into a higher product price or a processing fee. Compare the on-road price with and without the scheme before celebrating.
How do I compare two loan offers?
Convert everything to reducing-balance rate AND compare total interest payable. Same tenure + lower total interest = cheaper loan, regardless of how the rate is quoted.
Are flat rates ever okay?
Only if the converted reducing rate still beats alternatives. A genuinely cheap flat rate exists — but verify with this calculator rather than trusting the headline.
What about processing fees?
Add them to the comparison: a "low rate" with 3% processing fee often loses to a slightly higher rate with zero fees. Compute total cost, not just rate.