Home Loan Prepayment: Month 12 vs Month 60 — When Does It Save More?
Published 29 June 2026 · Home Loans
Rahul and his friend Sanjay both work in Mumbai. Both took ₹50 lakh home loans at 8.5% for 20 years, starting in the same month. Both received a ₹5 lakh Diwali bonus. Rahul got his in year 1 and put it straight toward the loan. Sanjay got his in year 5 and did the same thing.
Rahul saved ₹12.3 lakh in interest. Sanjay saved ₹8.1 lakh. The same ₹5 lakh. The same loan. The same interest rate. The only difference was timing — and it produced a 52% gap in savings. Here is the math behind why early prepayment always wins.
Why the First Year Is the Most Valuable Year
Home loan interest is calculated on the outstanding principal each month. In month 1 of a ₹50L loan at 8.5%, your EMI of ₹43,391 breaks down like this:
Interest = ₹50,00,000 × 8.5% ÷ 12 = ₹35,417 (81.6% of EMI). Principal = ₹43,391 – ₹35,417 = ₹7,974 (18.4% of EMI).
By month 60 (year 5), the outstanding principal has reduced to roughly ₹45.6 lakh. The breakdown shifts: interest is approximately ₹32,300 and principal is ₹11,091. By month 120 (year 10), the split is closer to ₹27,500 interest and ₹15,891 principal.
When Rahul prepays ₹5 lakh in month 12, he is reducing a principal that would have attracted heavy interest for the next 19 years. Every rupee of that ₹5 lakh was going to cost him roughly 0.708% per month in interest for nearly two decades. That is the compounding effect he short-circuits. Sanjay's ₹5 lakh at month 60 kills the same principal, but now it only has 15 years left to compound — not 19.
₹5L Prepayment — Interest Saved vs Timing
All figures assume ₹50L loan at 8.5% for 20 years, with ₹5L prepaid in tenure-reduction mode:
| Prepayment at Month | Interest Saved | Tenure Cut |
|---|---|---|
| Month 12 | ₹12.3L | 3.2 years |
| Month 36 | ₹10.1L | 2.6 years |
| Month 60 | ₹8.1L | 2.1 years |
| Month 120 | ₹4.2L | 1.1 years |
The savings drop by roughly ₹4L for every five years you delay. Waiting from month 12 to month 120 costs you ₹8.1L in lost savings — on a prepayment that itself is only ₹5L. The opportunity cost of waiting is larger than the prepayment amount.
Run this for your own numbers
Calculate Your Prepayment Savings →What Most People Get Wrong About Prepayment
The most common mistake: waiting until you have a "large enough" amount. People think ₹1 lakh is too small to bother with and wait until they have ₹5 lakh or ₹10 lakh. The math does not support this.
₹1 lakh prepaid in year 1 saves approximately ₹2.46L in interest. ₹2 lakh prepaid in year 10 saves approximately ₹1.68L in interest. The smaller, earlier amount saves more. Frequency matters less than timing — one well-timed prepayment in year 1 beats three prepayments in year 8.
The other mistake is choosing EMI reduction over tenure reduction when prepaying. EMI reduction gives you monthly cash flow relief — the benefit is spread over many future months in the form of a slightly lower EMI. Tenure reduction concentrates the benefit as eliminated future interest. Unless you genuinely need the lower monthly payment, always choose tenure reduction when given the option.
Frequently Asked Questions
Does it make sense to prepay a home loan?
Yes, in most cases — especially in the first half of the loan tenure. Prepaying ₹5L at month 12 on a ₹50L@8.5%/20yr loan saves ₹12.3L in interest and cuts 3.2 years off your tenure.
When is the best time to prepay a home loan?
The earlier in the loan tenure, the better. Interest is front-loaded in the amortization schedule — in the first year, about 78% of each EMI goes toward interest. Prepaying early reduces the principal that earns this heavy interest.
How much interest is saved by prepaying a home loan early?
On a ₹50L loan at 8.5% for 20 years: a ₹5L prepayment at month 12 saves ₹12.3L and cuts 3.2 years; the same prepayment at month 60 saves ₹8.1L and cuts 2.1 years.
What is the minimum prepayment amount for a home loan?
Most banks have no minimum for partial prepayment. SBI, HDFC, and ICICI allow prepayments of any amount online. Check your loan agreement for any prepayment charges — floating rate loans typically have zero prepayment penalty.
Is it better to reduce EMI or tenure when prepaying a home loan?
Reducing tenure saves more interest. Reducing EMI gives monthly cash flow relief. If your income is stable, choose tenure reduction — it gets you debt-free faster and saves more total interest.
Do you have a bonus or windfall coming this year — and have you calculated what it would save if you put it toward your home loan today instead of next year?