Flat Rate vs Reducing Rate: What 8% Flat Really Costs
The difference in one example
Take a ₹5 lakh loan over 3 years.
- Flat 8%: interest is 5,00,000 × 8% × 3 = ₹1,20,000. Add it to the principal and divide by 36 months: EMI = ₹17,222.
- Reducing 12%: the EMI is ₹16,607.
The 8% flat loan has the higher EMI. The flat rate looked four points cheaper, but it costs more every month.
Why a flat rate costs so much more
With a flat rate, interest is calculated on ₹5 lakh for all 3 years, even though your outstanding balance falls every month. By the final month you owe almost nothing but you are still being charged as if you owed the whole amount.
A reducing-balance rate charges interest only on the amount you still owe. This is how banks quote home, car and most personal loans.
Flat to reducing rate conversion
The equivalent reducing-balance rate for common flat rates:
| Flat rate | 3-year loan | 5-year loan |
|---|---|---|
| 6% | 11.1% | 10.8% |
| 7% | 12.8% | 12.5% |
| 8% | 14.5% | 14.1% |
| 9% | 16.2% | 15.7% |
| 10% | 17.9% | 17.3% |
| 12% | 21.2% | 20.3% |
As a rule of thumb, multiply the flat rate by about 1.8 to get the reducing rate. Use the flat to reducing rate calculator for any rate and tenure.
Reducing-balance method, monthly compounding. Rate shown is indicative: confirm the live rate with your lender.
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*Monthly take-home needed if EMI is capped at 50% of income.
Year-by-year repayment schedule
| Year | Principal paid | Interest paid | Balance |
|---|---|---|---|
| Year 1 | ₹29,757 | ₹9,529 | ₹70,243 |
| Year 2 | ₹33,201 | ₹6,086 | ₹37,042 |
| Year 3 | ₹37,042 | ₹2,244 | ₹0 |
Where you will see flat rates
Two-wheeler and used-car finance, some small personal loans, consumer-durable loans, and "0% EMI" or low-rate dealer schemes. A "0% EMI" offer may hide the cost in a processing fee or a higher product price, so compare the total amount paid.
How to compare two loans correctly
- Ask for the reducing-balance rate, or the APR including fees.
- Compare the total amount you will repay for the same loan amount and tenure.
- Add up processing fees, documentation charges and insurance bundled into the loan.
- Check the foreclosure charge if you might repay early.
FAQ
What is a flat interest rate?
A flat rate charges interest on the original loan amount for the whole tenure, regardless of how much you have already repaid.
Is a flat rate or a reducing rate better?
For the same stated number, a reducing rate is far cheaper. Convert any flat rate to a reducing rate before comparing.
How do I convert flat rate to reducing rate?
Compute the flat-rate EMI (principal plus total flat interest, divided by the months), then find the monthly rate that gives the same EMI under the reducing-balance formula. Or multiply the flat rate by about 1.8 for a quick estimate.
Is 0% EMI really free?
Not always. Check for processing fees, a higher product price, or lost cash discounts. Compare the total you will pay with the cash price.
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This guide is for general information, not financial advice. Rates and rules change: confirm current terms with your lender.