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Priya, 29, is a schoolteacher in Nagpur. Her cooperative bank offered her a ₹1,00,000 personal loan at "12% per annum." She signed happily — 12% sounded reasonable.
Six months later, a colleague told her the bank was actually charging closer to 22%. Priya didn't believe it. She had the paper right there: 12% per annum. Black and white.
Her colleague was right. The bank was using a flat rate method. The paper said 12%. The truth was 22%.
This is one of the oldest tricks in Indian lending — and it is entirely legal, as long as it is disclosed. Most of the time, it is not explained clearly.
Three Methods, Three Very Different Costs
Method 1: Flat Rate (Also Called Add-On Rate)
In the flat rate method, interest is calculated on the original principal for the entire loan tenure — even as you repay the principal each month.
Example: ₹1,00,000 loan at 12% flat for 2 years
Annual interest = 12% × ₹1,00,000 = ₹12,000 Total interest for 2 years = ₹24,000 Total repayment = ₹1,00,000 + ₹24,000 = ₹1,24,000 Monthly EMI = ₹1,24,000 ÷ 24 = ₹5,167
The problem: By month 12, you have already repaid ₹60,000 of principal. But you are still being charged 12% on the original ₹1,00,000 — not the ₹40,000 you still owe. You are paying interest on money you already gave back.
The equivalent reducing balance rate for this loan: approximately 21.5%
Method 2: Reducing Balance Rate (Also Called Diminishing Balance)
In the reducing balance method, interest is calculated on the outstanding principal — which reduces each month as you repay.
Same loan: ₹1,00,000 at 21.5% reducing balance for 2 years
Month 1 interest: 21.5%/12 × ₹1,00,000 = ₹1,792 Month 2 interest: 21.5%/12 × ₹98,450 (reduced by principal repaid) = ₹1,764 ...and so on, reducing every month Monthly EMI = approximately ₹5,167 (same EMI!)
The EMI is identical. The total interest paid is similar. But the reducing balance rate (21.5%) honestly represents the true cost. The flat rate (12%) conceals it.
Most banks and NBFCs now use reducing balance, because RBI strongly recommends it. But some cooperative banks, microfinance institutions, and gold loan companies still use flat rates — legally, if disclosed.
Method 3: Daily Reducing Balance
Used by many digital loan apps. Interest accrues daily on the outstanding balance. This is the most granular method and, for short-tenure digital loans, produces the highest-looking effective APRs.
Example: ₹10,000 at 0.5% per day, 30-day tenure
Day 1 interest: 0.5% × ₹10,000 = ₹50 Day 2 interest: 0.5% × ₹10,050 = ₹50.25 (if compounding daily) Total 30-day cost: approximately ₹1,614 Effective APR: 195% (not 0.5%)
How to Tell Which Method Your Loan Uses
Ask directly: "Is this flat rate or reducing balance rate?" A legitimate lender must answer this. If they cannot, escalate to their Nodal Officer.
Check the KFS: The Key Facts Statement (RBI mandated since 2022) must state the APR. If the APR is roughly double the stated interest rate, you have a flat rate loan.
Run the numbers: Use SahiSujhav's EMI Truth Calculator. Enter what you were told you'd receive, your actual EMI, and the tenure. The calculator shows your true APR regardless of which method the lender uses internally.
The rule of thumb: For personal loans, if a lender quotes a rate and the EMI seems surprisingly affordable for that rate, suspect a flat rate. A flat rate at 12% produces the same EMI as a reducing balance rate at approximately 21–22%.
Who Uses Which Method
| Lender Type | Typical Method | Risk Level |
|---|---|---|
| Public sector banks | Reducing balance | Low |
| Private banks | Reducing balance | Low |
| Large NBFCs | Reducing balance | Low |
| Digital loan apps | Daily reducing | Medium (high APR for short tenure) |
| Cooperative banks | Sometimes flat rate | Medium |
| Microfinance institutions | Flat rate (common) | High — effective APR often 40–80% |
| Gold loan companies | Sometimes flat rate | Medium |
| Chit funds / informal lenders | Flat rate | Very high |
Priya's Resolution
When Priya checked her loan documentation carefully, she found the word "flat" in fine print on page 3 of the loan agreement. Her bank had disclosed it — technically. But the sales agent had presented it as "just 12%."
Priya complained to the bank's Nodal Officer, citing that the APR was not prominently disclosed as required by RBI guidelines. The bank could not reverse the loan but agreed to reclassify remaining interest at the reducing balance equivalent — saving Priya approximately ₹4,200.
This outcome is not guaranteed. But it happened because Priya understood the difference and made a specific, RBI-cited complaint.
Your Action Steps
Right now: Find out whether your loan uses flat or reducing balance. Check your loan agreement or KFS. Calculate your real APR: Use SahiSujhav's EMI Truth Calculator — free at www.sahisujhav.com If you were not clearly told: Ask HeyZ AI to draft a KFS compliance complaint to your lender. Before your next loan: Always ask "Is this flat or reducing balance?" and always request the APR in writing before signing.
SahiSujhav's EMI Truth Calculator works for all three rate methods. Enter your numbers and see your true APR in under 60 seconds.
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