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Flat vs Reducing Rate Calculator
True cost of flat rate loans · Equivalent reducing rate · Interest difference · Updated 2026
Flat → equivalent reducingReducing → flatTotal interest savedAmortization table
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A 14% flat rate loan is NOT the same as a 14% reducing rate loan
A 14% flat rate charges interest on the full original principal every month - even as you repay it. A 14% reducing rate charges interest only on the outstanding balance, which shrinks each month. The flat rate hides the true cost. 14% flat ≈ 25–26% reducing for a 2-year loan.
Enter the flat rate loan details - find the true (reducing) rate
₹
₹10K₹1Cr
% p.a.
136
months
3360
= 2yr
14% flat rate is equivalent to
22.9%
reducing balance rate for a 2yr loan
Monthly EMI
₹26,667
Total interest
₹1.40 L
Total repayment
₹6.40 L
Effective rate
22.90% reducing
14.00% flat → equivalent reducing rate by tenure
Loan: ₹5.00 L - the shorter the tenure, the higher the hidden cost
| Tenure | Flat EMI | Total interest | Equivalent reducing rate | Interest if reducing at same rate |
|---|---|---|---|---|
| 6mo | ₹89,167/mo | ₹35,000 | 22.64% | ₹20,614 |
| 1yr | ₹47,500/mo | ₹70,000 | 23.31% | ₹38,723 |
| 1.5yr | ₹33,611/mo | ₹1.05 L | 23.19% | ₹57,237 |
| 2yr(yours) | ₹26,667/mo | ₹1.40 L | 22.90% | ₹76,155 |
| 3yr | ₹19,722/mo | ₹2.10 L | 22.22% | ₹1.15 L |
| 4yr | ₹16,250/mo | ₹2.80 L | 21.54% | ₹1.56 L |
| 5yr | ₹14,167/mo | ₹3.50 L | 20.93% | ₹1.98 L |
Flat Rate vs Reducing Balance - India's Most Misunderstood Loan Concept
When an NBFC or lender quotes you a "12% interest rate," they may mean something very different from your bank's "12% interest rate." Banks and regulated lenders use the reducing balance method - which charges interest only on the outstanding loan balance each month. Many NBFCs, personal loan apps, and informal lenders use the flat rate method - which charges interest on the original principal throughout the entire tenure, even as you repay.
The difference is enormous. A 12% flat rate loan is equivalent to approximately 21–22% reducing balance - nearly double. The flat rate hides the true cost of borrowing by anchoring on a lower-sounding number.
How each method calculates interest
Flat rate method
Monthly interest = Principal × Annual rate ÷ 12
EMI = (Principal + Total interest) ÷ Months
₹5L at 12% flat for 24 months:
Monthly interest = ₹5L × 12% ÷ 12 = ₹5,000 every month
Total interest = ₹5,000 × 24 = ₹1,20,000
EMI = (₹5L + ₹1,20,000) ÷ 24 = ₹25,833
Reducing balance method
Monthly interest = Outstanding balance × Monthly rate
EMI = fixed via reducing formula
₹5L at 12% reducing for 24 months:
Month 1: Interest on ₹5L = ₹5,000
Month 2: Interest on ₹4,76,453 = ₹4,765
...interest falls each month as balance reduces
EMI = ₹23,537 · Total interest = ₹64,888
How to identify if a loan is flat or reducing rate
1
Ask the lender directly - and get it in writing
Directly ask: 'Is this flat rate or reducing balance rate?' If the lender is evasive or unclear, that's a red flag. RBI mandates disclosure of the Annual Percentage Rate (APR) which should reflect the true cost including all fees.
2
Check if the interest component changes each month
In a reducing balance loan, the interest portion of your EMI decreases every month as the principal reduces. In a flat rate loan, the interest portion is constant every single month. Ask for the amortization schedule — flat rate loans won't have a changing interest portion.
3
Calculate the effective annual rate yourself
Use the flat→reducing calculator above. If a lender quotes 12% but the equivalent reducing rate comes out to 22%, the loan is far more expensive than alternatives. Always compare loans using the reducing balance equivalent rate — never compare a flat rate to a reducing rate directly.
4
Compare total interest paid, not just EMI
Don't compare loans by EMI alone - a lower EMI may hide a longer tenure or flat rate that costs far more total interest. Always compare: total interest paid ÷ principal borrowed = effective interest cost percentage. This normalizes across different tenures and methods.
Calculate your actual EMI
Full amortization schedule for home, car, and personal loans
Frequently asked questions
Do banks in India use flat rate or reducing balance?▼
All scheduled commercial banks in India (SBI, HDFC, ICICI, Axis, etc.) are required by RBI to use the reducing balance method for all loan products — home loans, car loans, personal loans, and education loans. Flat rate loans are primarily used by NBFCs, microfinance institutions, some credit cooperatives, and informal moneylenders. Some personal loan apps also quote flat rates to make their rates sound lower. Always verify the method before signing any loan agreement.
Which is better — flat rate or reducing balance?▼
Reducing balance is always better for the borrower when comparing loans at the same quoted rate. The flat rate method systematically overstates the interest you pay relative to the stated rate. A 12% flat rate loan charges nearly the same total interest as a 21–22% reducing balance loan - but sounds cheaper. When comparing any two loans, convert both to reducing balance equivalent rates first, then compare apples to apples.
Why do lenders use flat rates if it's more expensive for borrowers?▼
Flat rates are used precisely because they make the loan sound cheaper. A borrower comparing '12% flat' versus '18% reducing' intuitively assumes the flat rate loan is cheaper — but it isn't. The actual interest cost of 12% flat (over 2 years) is equivalent to about 21% reducing. NBFCs and informal lenders use this to attract borrowers who don't know the difference. This is why financial literacy around flat vs reducing rates is so important.
Is the rule of thumb 'flat rate × 2 = reducing rate' accurate?▼
The rough rule of thumb is: Flat rate × 1.8 to 2.0 ≈ equivalent reducing rate. This approximation is most accurate for 2–3 year tenures. For shorter tenures (6–12 months), the multiplier is higher (2.0–2.2×). For longer tenures (5 years), the multiplier is lower (1.6–1.8×). The exact conversion depends on both the rate and the tenure — which is why using this calculator gives a more precise answer than the rule of thumb.
Can I prepay a flat rate loan early?▼
Technically yes, but prepaying a flat rate loan doesn't save as much interest as you'd expect. With a reducing balance loan, prepayment reduces the outstanding principal on which future interest is calculated — saving substantial interest. With a flat rate loan, the total interest is pre-computed on the original principal regardless of how quickly you repay. Some flat rate lenders do recalculate on prepayment, but many don't — effectively locking in the full interest even if you repay early. Always check the prepayment clause specifically for flat rate loans.