Flat Rate vs. Reducing Balance Interest: What's the Difference?
When taking a loan from a bank or buying a bike on EMI, you often hear terms like "Flat Rate" and "Reducing Balance." While the interest percentage might look the same (e.g., 10%), the amount of money you pay back is completely different.
1. Flat Rate Interest
In this method, interest is calculated on the full original principal amount throughout the entire loan tenure, even if you have already paid back half the loan.
Loan: ₹1,00,000
Rate: 10% Flat
Interest: ₹10,000 every year, regardless of how much you repay.
Verdict: This is very expensive for the borrower but profitable for the lender.
2. Reducing Balance (Diminishing) Interest
Here, interest is calculated only on the outstanding balance (the money currently remaining).
Loan: ₹1,00,000
Rate: 10% Reducing
Year 1: Interest on ₹1L = ₹10,000. (You pay back ₹50k principal).
Year 2: Interest is now on remaining ₹50k = ₹5,000.
Verdict: This is cheaper for the borrower and is the standard for home loans and credit cards.
Which one are you using?
In the unorganized sector (friends, family, local lending), most dealings work like a Reducing Balance system but with flexible payments. You pay interest only on what you owe. However, if you don't track the dates of every repayment accurately, you might end up calculating like a Flat Rate system, which is unfair.
Conclusion
Transparency builds trust. Always clarify with your borrower or lender which method is being used.
Track Reducing Balances Automatically: With Byaj Khata Book, every time you add a repayment (minus entry), the app automatically adjusts the principal and calculates future interest only on the remaining balance.