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Under a flat interest rate, the interest is calculated on the original principal throughout the entire loan tenure. The monthly interest component remains unchanged, even as you repay the principal. This means you pay interest on the full amount you borrowed from start to finish.
Example: A ₹1,00,000 loan at 10% flat interest for 2 years.
With a single set of inputs, the flat vs reducing rate calculator computes and contrasts the two methods side by side. You don’t need to calculate the interest manually. The tool shows you exactly how much you’d repay under each structure. That visibility makes it easier to decide whether a flat‑rate or reducing‑rate product suits your budget.
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A reducing interest rate, also called the diminishing balance method, calculates interest on the outstanding principal after each EMI payment with a flat vs reducing rate calculator. As you repay the loan, the principal reduces, and the next month’s interest is computed on that lower balance. Over time, your interest outgo falls.
For example, a ₹10,00,000 loan at 12% annual reducing rate will have a higher interest component in the first month and a progressively smaller one later. The reducing balance method typically results in a lower total interest payout compared to a flat rate of the same percentage. This is easily calculated using the flat vs reducing rate calculator.
The table below summarises the key distinctions:
| Parameter | Reducing Interest Rate | Flat Interest Rate |
|---|---|---|
| Definition | Interest is calculated on the outstanding balance after each EMI, which decreases over time. | Interest is calculated on the original loan amount, remaining constant throughout. |
| Interest Calculation | Monthly interest = Outstanding principal × (Annual Rate ÷ 12). | Monthly interest = Original loan amount × (Annual Rate ÷ 12) |
| Interest Component | Decreases over tenure as principal reduces. | Stays the same for the entire tenure. |
| Best Suited For | Long‑term loans like home loans, business loans, and personal loans. | Short‑term or small‑ticket loans like consumer durable financing. |
A flat vs reducing rate of interest calculator delivers several practical advantages. It removes manual errors, provides instant side‑by‑side EMI numbers, and clarifies the total interest payable under each method. You can compare loan offers quickly; no spreadsheet needed. It’s particularly useful when evaluating personal loan interest rates from multiple lending partners on the Airtel App, as you can run different scenarios and settle on an affordable repayment plan.
With the flat vs reducing rate calculator, you enter three values: loan amount, annual interest rate, and tenure. The tool immediately calculates and displays two sets of results; one using the flat method and the other using the reducing method. Here’s what it helps you do:
See total repayment amounts for both methods at a glance.
Know the exact EMI you’ll pay under each structure.
Spot the method that costs less over the full tenure.
Compare the overall borrowing cost before making a decision.
Align EMI commitments with your monthly budget before signing up.
The flat vs reducing rate calculator uses straightforward formulas to give you an accurate loan cost comparison.
(Principal × Rate × Tenure in years) / (Number of months) = Monthly EMI
EMI = [P × R × (1+R)^N] / [(1+R)^N – 1]
Where P = Principal, R = monthly interest rate, N = tenure in months.
If you’d rather not do the math, the Personal Loan EMI Calculator on the Airtel App handles both calculations instantly.
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