Loan Prepayment Calculator

Evaluate the exact interest savings and tenure reduction from making a partial loan prepayment.

₹

Current remaining balance on your loan

%

Current annual interest rate

Months

Total remaining monthly payments (e.g. 15 years = 180 months)

₹

Lump-sum amount you plan to prepay

Tenure reduction maximizes interest saved

Results

Total Interest Saved
₹6,45,350
Current Monthly EMI₹29,542
Tenure Saved32 months (2.7 yrs)
Revised Remaining Tenure months (NaN yrs)
Revised Monthly EMI₹NaN

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:

Outstanding Balance before Prepayment:₹30,00,000
Lump-Sum Prepayment Amount:₹3,00,000 (10% of balance)
Revised Principal Balance (P_new):₹27,00,000
Original Monthly EMI:₹29,542
Strategy A: Reduce Tenure (Keep EMI at ₹29,542)
New Remaining Tenure:148 months (12.3 years)
Tenure Saved:32 months (2.7 years)
Total Interest Saved:₹6,45,333
Strategy B: Reduce EMI (Keep Tenure at 180 Months)
Revised Monthly EMI:₹26,587 (saves ₹2,955/mo)
Total Interest Saved:₹5,31,750

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.

Debating whether to prepay your home loan or invest in mutual funds?Read our in-depth research guide on Home Loan Prepayment vs. SIP: Which Builds More Wealth? to see the 20-year net wealth math, tax impacts, and the 5-year hybrid repayment framework.
How do interest rate cycles affect prepayments on floating vs. fixed loans?Read our analysis on Fixed vs. Floating Rate Loans: How to Decide in Changing Interest Rate Cycles to model tenure expansion and RBI repo rate reset dynamics.

Frequently asked questions

Should I choose tenure reduction or EMI reduction when prepaying?
If your current monthly cash flow is comfortable, reducing tenure saves significantly more interest because loan interest compounds over a shorter timeframe. If your monthly cash flow is strained, reducing EMI lowers your monthly obligation and improves liquidity.
How does part-prepayment save interest on a reducing-balance loan?
Every rupee of prepayment directly deducts from the outstanding principal balance. Since future monthly interest is computed strictly on the remaining principal, shrinking the principal immediately reduces monthly interest accumulation.
Are there prepayment penalties on home loans?
Under RBI rules in India, banks and housing finance companies cannot charge prepayment or foreclosure penalties on floating-rate individual home loans. For fixed-rate loans or non-individual borrowers, penalties of 2% to 4% may apply.
What is the best time during a loan tenure to make a prepayment?
Prepayments yield the highest financial benefit early in the loan tenure, when the principal balance is highest and the interest component forms the largest portion of each monthly EMI installment.
Is there a minimum amount required for loan prepayment?
Most lending institutions mandate that partial prepayments equal at least one or two monthly EMIs, or a minimum threshold such as ₹10,000 to ₹25,000. Refer to your loan sanction letter for specific bank guidelines.

Total Interest Saved

₹6,45,350