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Flat Rate vs Reducing Balance Comparison

Discover the true cost difference — flat rates always have a higher effective cost

tuneLoan Details
Loan Amount
₹
≈ 5 Lakh
Flat Interest Rate
% p.a.
4%20%
Reducing Balance Rate
% p.a.
4%30%
Loan Tenure
Years
1 yr10 yrs
Cheaper Loan Saves
₹—
Calculating...
Flat Rate Equiv.
—% p.a.
Effective reducing-balance rate
Flat Rate Reducing Balance
Interest Rate 8% p.a. 14% p.a.
Monthly EMI — —
Total Interest — —
Total Payment — —
—

functions Flat Rate EMI

EMI = (P + P × r × t) / (t × 12)

Flat rate charges interest on original principal throughout — much more expensive than reducing balance where interest reduces as you repay.

Flat Rate vs Reducing Balance — What's the Difference?

In a flat rate loan, interest is calculated on the original principal for the entire tenure — even though you're repaying part of the principal every month. This makes the effective interest significantly higher than the advertised rate.

In a reducing balance loan, interest is calculated only on the outstanding balance. As you repay principal, the interest component of each EMI decreases — this is how most banks calculate home, car, and personal loans. Always ask lenders for the reducing balance rate before comparing.

lightbulb Key Insight
Rule of thumb: A flat rate of X% is roughly equivalent to a reducing balance rate of 1.7–1.9× X%
1Flat 8% for 3 years ≈ Reducing 14.5% p.a.
2Flat 10% for 5 years ≈ Reducing 18.7% p.a.
3Always ask: "Is this flat rate or reducing balance?"
✓ NBFCs and vehicle dealers often quote flat rates — always convert to reducing balance before comparing
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Frequently Asked Questions

Flat rate vs reducing balance — the hidden cost explained

Why do NBFCs and vehicle dealers quote flat rates?
Because flat rates appear lower. A flat 8% sounds much better than a reducing 14.5% even though they cost the same. Most borrowers don't know how to convert flat to reducing, so lenders use this to make their offering appear cheaper. RBI requires banks to disclose the effective annualised rate, but this rule is inconsistently enforced by NBFCs.
How do I convert a flat rate to reducing balance rate?
There's no simple formula — you need to solve iteratively. The method: (1) calculate flat rate total interest = P × flat rate × years; (2) calculate flat EMI = (P + total interest) / months; (3) find the reducing rate where the EMI formula gives the same EMI as the flat EMI. This calculator does that automatically and shows you the equivalent reducing rate.
Do all Indian banks use reducing balance method?
Yes. All scheduled commercial banks (PSU and private) are required by RBI to use the reducing balance method for loans. The flat rate method is common in: vehicle financing by dealers, some NBFC small-ticket loans, hire purchase agreements, and informal lending. If a lender quotes a flat rate, ask for the reducing balance equivalent or the Total Payable amount before signing.

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