Loan Prepayment Calculator
Evaluate the exact interest savings and tenure reduction from making a partial loan prepayment.
Input Error
Current remaining balance on your loan
Current annual interest rate
Total remaining monthly payments (e.g. 15 years = 180 months)
Lump-sum amount you plan to prepay
Tenure reduction maximizes interest saved
Results
Assumes reducing balance interest calculation without prepayment penalties.
How loan prepayment savings work
Every rupee of prepayment directly subtracts from your outstanding loan principal. Because monthly interest on reducing-balance loans is computed strictly on the remaining unpaid principal balance, shrinking the principal immediately prevents future interest compounding:
P_new = Outstanding Balance − Prepayment Amount
Strategy 1: Tenure Reduction (Keep EMI constant)
n_new = ⌈ −ln(1 − (r × P_new / EMI)) / ln(1 + r) ⌉
Here, the monthly EMI remains unchanged, so a greater fraction of each subsequent installment repays principal, accelerating debt payoff and maximizing interest savings.
Strategy 2: EMI Reduction (Keep tenure constant)
EMI_new = [P_new × r × (1 + r)^n] / [(1 + r)^n − 1]
Here, the remaining tenure is preserved, recalculating a lower monthly installment to enhance immediate monthly household liquidity.
Step-by-step worked example: ₹30 Lakh Loan
Consider an outstanding home loan balance of ₹30,00,000 at an annual interest rate of 8.5% with 180 months (15 years) remaining. The current monthly EMI is ₹29,542, with a cumulative remaining interest obligation of ₹23,17,498. You decide to make a ₹3,00,000 lump-sum prepayment:
Key Comparison: Choosing tenure reduction saves an additional ₹1,13,583 in interest compared to EMI reduction because the debt is liquidated 32 months earlier.
Decision guide: Tenure reduction vs. lower EMI
When to Choose Tenure Reduction
- Your regular monthly salary/cash flow comfortably accommodates the current EMI.
- Your primary objective is minimizing total lifetime finance costs.
- You want to achieve debt freedom before major milestones (e.g. child education, retirement).
- Highest compounded interest savings over the life of the loan.
When to Choose EMI Reduction
- Household monthly budget is tight, or living expenses have escalated.
- You are transitioning careers, starting a venture, or anticipating income variability.
- You want to improve your debt-to-income (DTI) ratio to qualify for other credit facilities.
- Provides immediate cash flow relief every single month.
Assumptions & practical considerations
Prepayment Penalty Rules
Under Reserve Bank of India (RBI) regulations, banks and HFCs cannot levy foreclosure or prepayment charges on floating-rate individual home loans. However, fixed-rate loans and commercial facilities may carry penalties (2%–4%).
Lender Processing Guidelines
Lenders frequently specify minimum prepayment thresholds (such as minimum 1 or 2 EMIs or ₹10,000–₹25,000) and may restrict the frequency of partial payments per financial year.
Tax Shield Considerations
Under the Old Tax Regime in India, Section 24(b) permits interest deduction up to ₹2,00,000 for self-occupied property. Substantially shrinking loan interest reduces this tax shield, which should be factored into net savings.
Guaranteed vs. Equity Returns
Prepaying an 8.5% loan yields a guaranteed, tax-free return of 8.5%. Compare this risk-free hurdle rate against alternative long-term investment options before deploying surplus capital.
Frequently asked questions
Should I choose tenure reduction or EMI reduction when prepaying?
How does part-prepayment save interest on a reducing-balance loan?
Are there prepayment penalties on home loans?
What is the best time during a loan tenure to make a prepayment?
Is there a minimum amount required for loan prepayment?
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Total Interest Saved
₹6,45,350