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In summary
Understanding Home Loan
Most home loans and long-term loans use reducing balance rates, while some car loans and personal loans use flat rates. Converting between the two helps you compare loan offers accurately and identify which is cheaper over the full tenure.
This page covers:
- What a reducing interest rate is and how it works
- What a flat interest rate is and how it works
- Why converting reducing rate to flat rate is useful
- The conversion formula with a worked example
- When to use flat rate calculations
- Which type is better for which loan
- Important points to remember when comparing loans
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What is a reducing interest rate?
A reducing interest rate (also called a diminishing balance rate) calculates interest on the outstanding loan amount at the end of each month. As you repay the principal, the outstanding balance falls — and so does the interest charged. This means each successive EMI pays proportionally more towards principal and less towards interest.
Reducing rates are standard for home loans, personal loans, and car loans because they correctly reflect the declining debt. The total interest paid under a reducing rate is significantly less than under a flat rate for the same nominal rate.
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What is a flat interest rate?
A flat interest rate calculates interest on the entire original loan amount throughout the loan tenure — regardless of how much principal you have repaid. The interest amount remains constant every month, making EMI calculations straightforward but resulting in a higher total interest cost compared to the equivalent reducing rate.
Example: Rs. 5 lakh at 10% flat rate over 3 years = Rs. 50,000 interest per year, regardless of repayment progress.
Flat rates are commonly used in car loans and some personal loans where simple EMI structures are preferred.
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How do reducing rate and flat rate compare?
| Feature | Reducing interest rate | Flat interest rate |
|---|---|---|
| Interest calculated on | Outstanding balance (decreases each month) | Original loan amount (fixed throughout) |
| EMI structure | EMI is fixed but interest-to-principal ratio changes | Fixed interest amount every month |
| Total interest paid | Lower — interest reduces as principal reduces | Higher — full interest on original amount throughout |
| Common usage | Home loans, personal loans, car loans | Some car loans, consumer finance products |
| Transparency | Better reflects true borrowing cost | Simpler to explain but masks true cost |
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Why would you want to convert reducing rate to flat rate?
Converting helps you compare loan offers on equal footing when different lenders quote in different formats:
- If one lender quotes a 10% reducing rate and another quotes 5.5% flat rate, which is cheaper? Converting one to the other's format gives a direct comparison
- It also helps you decide whether refinancing your current loan at a different rate type is financially worthwhile
- Flat rate equivalents give you a simple way to estimate total interest cost over the tenure
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Home loan for professionals
How to convert reducing rate to flat rate — formula and example
Formula: Flat Rate = (2 × Reducing Rate) ÷ (1 + Loan Tenure in Years)
Worked example
Home loan of Rs. 10 lakh at a reducing rate of 10% p.a. for 5 years:
- Flat Rate = (2 × 10%) ÷ (1 + 5)
- Flat Rate = 20% ÷ 6
- Flat Rate = 3.33%
So a 10% reducing rate on a 5-year loan is equivalent to approximately 3.33% flat rate. If a competing lender offers 4% flat on the same loan, the 10% reducing rate loan is actually cheaper.
What the formula tells you
The formula reveals that flat rates always appear numerically lower than their reducing rate equivalent — which is why comparing loan offers without converting can lead to incorrect conclusions. A seemingly low flat rate can hide a much higher true borrowing cost.
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When should you use flat rate calculations?
Use flat rate calculations when you want to:
- Compare loans from multiple lenders who quote different rate types — convert all to the same type before comparing
- Understand total interest cost — a flat rate gives a quick estimate of how much you will pay in interest over the full tenure
- Evaluate refinancing decisions — check whether switching from your current reducing rate loan to a flat rate offer (or vice versa) will actually save money
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Which type of interest rate is better?
| Loan type | Preferred rate type | Why |
|---|---|---|
| Home loans (long tenure) | Reducing rate | Significant interest saving as the large principal reduces over 15-30 years |
| Personal loans (short tenure) | Either — compare using formula | Tenure is short, so the difference is smaller |
| Car loans | Usually flat rate | Common industry practice; compare with reducing rate offers |
For long-tenure loans like home loans, always prefer reducing rates. The actual interest saving over a 20-30 year tenure compared to an equivalent flat rate is substantial — often lakhs of rupees.
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Important points to remember
- The conversion formula gives an approximate value — actual interest cost may vary slightly based on compounding method
- Always consider processing fees, prepayment charges, and other costs alongside the interest rate when comparing loans
- A lower flat rate number does not mean a cheaper loan — always convert to the same type before comparing
- For home loans specifically, the difference between flat and reducing rates over a 20-year tenure can amount to several lakhs in total interest
Understanding the difference between reducing and flat rates — and knowing how to convert between them — puts you in a stronger position when comparing home loan offers. Bajaj Housing Finance offers home loans from 7.25% p.a.* p.a.* (reducing balance) with amounts up to Rs. Rs. 15 Crore* and tenures up to 32 years years. Check your eligibility today.
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Frequently Asked Questions
About the conversion
Choosing the right rate
Is the flat rate conversion formula accurate for all loan types?
The formula Flat Rate = (2 × Reducing Rate) ÷ (1 + Tenure in Years) gives a good approximation for comparison purposes. The exact result can vary slightly depending on the compounding method used by the lender (monthly, quarterly, or annual) and any special fee structures. For precise comparisons, ask your lender for the full amortisation schedule showing total interest outgo.
Why do flat rates appear lower than reducing rates for the same loan?
Flat rates are applied to the original loan amount throughout the tenure, while reducing rates are applied to the declining balance. Because the flat rate base (original amount) is higher than the reducing rate base (which shrinks with each repayment), a flat rate appears numerically lower while actually resulting in higher total interest payments. A flat rate of 5% can cost more in total interest than a reducing rate of 8-9% on the same loan.
For a home loan, should you always choose reducing balance over flat rate?
Yes, for home loans. Home loans typically have tenures of 15 to 32 years and large principal amounts. Under a reducing balance method, the principal reduces every month — meaning interest is charged on progressively smaller amounts. This results in substantially lower total interest paid compared to a flat rate on the same nominal rate. The difference over a 20-year tenure on a Rs. 50 lakh loan can easily exceed Rs. 10-15 lakh.
How do you check if a lender is quoting a flat rate or reducing rate?
Ask the lender directly, or check the loan agreement. If the EMI calculation uses the original loan amount as the base for interest throughout the tenure, it is a flat rate. If the EMI calculation uses the outstanding balance (which reduces each month), it is a reducing rate. Most lenders are required to disclose the effective annualised rate (reducing balance equivalent) in loan documents.
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