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Home loans are amortised: your EMI is fixed, but the split between interest and principal changes every month. In the early years, the majority of each EMI goes toward interest. As years pass, the principal portion gradually increases.

This front-loading of interest is why prepaying early has an outsized effect. Every rupee that reduces your principal in year 2 saves interest on that amount for the remaining 18 years of the loan. The same rupee prepaid in year 15 only saves 5 years of interest.

The first half of your loan tenure, roughly years 1 through 7–8, is when interest forms 70–80% of each EMI. Prepaying during this window gives you the maximum impact per rupee.

Here is the arithmetic: in year 1 of a ₹50L / 8.5% / 20-year loan, your outstanding balance is close to ₹50L. Each ₹1 lakh prepayment saves interest on ₹1L for the remaining 19+ years. In year 15, the outstanding balance is much lower and the remaining tenure is only 5 years, so the same ₹1L prepayment saves a fraction of that amount.

After the midpoint, the interest-to-principal ratio shifts. You are no longer in the high-interest phase. Prepaying at year 15 of a 20-year loan still saves money, but the savings are significantly smaller for the same outflow.

The table below shows the impact of adding ₹5,000/month extra on a ₹50L loan at 8.5% for 20 years, depending on when you start:

The table below shows how each monthly EMI breaks down between interest and principal across the life of a ₹40L loan at 8.5% for 20 years (EMI ≈ ₹34,700). Notice how the interest share dominates the early years and falls sharply after year 12.

Within a given loan year, timing a prepayment before the end of the financial year (March 31) has a small tax advantage for borrowers on the old income tax regime. Here is why:

• Section 24 allows deduction of home loan interest up to ₹2L per financial year. The interest in any given year is calculated on the outstanding principal at the start of that year.
• If you prepay in February or March, the principal reduction applies immediately. For the new financial year starting April 1, the outstanding balance is lower, so the annual interest (and therefore your Section 24 deduction) is slightly lower, but so is your total interest cost.
• A prepayment made in April instead of March effectively earns one extra month of interest reduction for the current financial year.
• For borrowers in the new tax regime, where home loan interest deductions are not available, this timing has no tax relevance, prepay whenever you have surplus cash.

Prepayment is not the right move in every situation. Four cases where you should wait or redirect funds elsewhere:

• You do not have 6 months of expenses in liquid savings, so build your emergency fund first
• You have higher-interest debt (personal loans, credit cards), and that debt costs more than your home loan, so clear it first
• You are in the final 3–4 years of the loan, when the remaining interest is small and the saving is minimal
• Your loan is fixed-rate and carries a prepayment charge that erodes or eliminates the saving

If none of these apply and you are in the first half of your loan tenure, there is a strong case for starting prepayment as early as possible.

Upload your home loan statement to see exactly how much you can save based on your current balance, rate, and tenure. If you want a quick bank-wise benchmark first, browse all home loan prepayment calculators by bank.