What this estimate uses
Loan amount, Flat annual rate, Reducing annual rate, Loan tenure.
Loans calculator
Which loan-rate method costs less?
Compare a flat-rate quote with a reducing-balance loan on monthly and total cost.
Your estimate
Live result
Interest saved with reducing rate
—How it works
A useful estimate, with the assumptions out in the open.
Flat interest is charged on the original principal for the full tenure. Reducing-balance interest is charged monthly on the outstanding principal. Fees and taxes are excluded.
This result is an educational estimate. Rates, taxes, fees, product rules, and market returns can change.
India-focused guide
Which loan costs less: a flat interest rate or a reducing balance rate?
Enter your own values above to compare flat-rate interest with reducing-balance loan interest and monthly payments. The live result separates the most important totals so you can compare scenarios before making a decision.
Important assumption
Flat interest is charged on the original principal for the full tenure. Reducing-balance interest is charged monthly on the outstanding principal. Fees and taxes are excluded.
Created and maintained byAll Tool Central
Formula and content reviewed20 August 2026
See how estimates are builtCalculation methodology
Detailed guide
Understand the result before using it.
This calculator converts flat-rate and monthly reducing-balance loan quotes into comparable monthly and total costs. The quoted percentages cannot be compared directly because a flat rate continues to use the original principal while a reducing rate applies to the outstanding balance.
Flat rate versus reducing balance
Under the flat method, total interest is calculated from the original loan amount for the full tenure and spread across all instalments. Repaying principal does not reduce the amount used in that interest formula.
Under the reducing method, each month’s interest is calculated on the outstanding principal. The EMI stays level in this model, but the interest portion generally falls and the principal portion rises as the balance declines.
FormulaFlat interest = principal × flat annual rate × years; reducing EMI uses the monthly rate and remaining principal
Example: ₹10 lakh for five years
An 8% flat quote can cost more than a 12% reducing-balance quote in this example. This is why the method, total repayment and annual percentage rate matter more than choosing the smaller-looking headline percentage.
| Method | Quoted annual rate | Monthly payment | Total interest | Total repayment |
|---|---|---|---|---|
| Flat rate | 8% | ₹23,333 | ₹4.00 lakh | ₹14.00 lakh |
| Monthly reducing balance | 12% | ₹22,244 | ₹3.35 lakh | ₹13.35 lakh |
How to compare real loan offers
Enter each offer using the method the lender actually quotes, then compare total repayment over the same principal and tenure. Ask for the Key Fact Statement and check the disclosed annual percentage rate, because processing fees and other charges can change the all-in cost.
A floating reducing-balance loan may not keep the same rate for the full tenure. A reset can change the EMI, tenure or both, so the calculator’s fixed-rate path is only a starting scenario.
Items excluded from the calculation
- Processing fees, documentation charges, insurance, GST on fees and other lender charges.
- Penal charges, missed-payment interest and payment-date differences.
- Rate resets on floating loans and lender-specific rounding.
- Prepayments or foreclosure and any applicable terms for applying them.
Common questions
Frequently asked questions
Is an 8% flat rate cheaper than a 12% reducing rate?
Not necessarily. The percentages use different principal bases. Compare the monthly payment, total interest, total repayment and disclosed APR over the same loan amount and tenure.
Why does flat-rate interest stay high as I repay the loan?
The simplified flat formula continues to calculate interest from the original principal for the entire tenure rather than the declining outstanding amount.
Does this result include a processing fee?
No. Fees, insurance, taxes and other charges are excluded. Add them when comparing the real all-in cost.
Will a reducing-balance EMI always remain fixed?
The calculator holds the entered rate constant. A floating-rate reset can change the EMI, the remaining tenure or both according to the loan terms.
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