Home Loan Prepayment vs SIP: Which Is Better? (The Math)
Short answer: Prepaying beats investing when your investments are likely to earn less than your loan rate. On a ₹50 lakh home loan at 8.5% over 20 years, putting an extra ₹10,000 a month into the loan clears it 7 years and 1 months early and saves ₹21.79 lakh of interest. Investing the same money wins only if it earns more than about 8.4% a year, before tax, over the whole period.
The setup
Take a home loan of ₹50 lakh at 8.5% a year for 20 years. The EMI is ₹43,391, and over the full term you pay ₹54.14 lakh as interest. You have ₹10,000 a month to spare and two choices: add it to your EMI as a prepayment, or invest it. Most Indian floating-rate loans to individuals can be prepaid without a penalty under the RBI’s 2025 prepayment directions for loans sanctioned or renewed from 1 January 2026, so the first option is usually open to you.
Option 1: prepay ₹10,000 every month
The extra money reduces your outstanding balance every month, so less interest is charged the next month. The loan ends in 155 months instead of 240, which is 7 years and 1 months earlier. Total interest falls from ₹54.14 lakh to ₹32.35 lakh, a saving of ₹21.79 lakh. This saving is certain, because it is simply interest you no longer owe.
Option 2: invest ₹10,000 every month
You keep paying the normal EMI for 20 years and invest the extra ₹10,000 a month. The result depends on the return, which nobody can promise. The table compares both options at three assumed returns. To be fair to the prepayment option, it assumes that once the loan is cleared you invest the whole freed-up EMI plus the extra ₹10,000, at the same return, until the original 20 years end.
| Assumed return on investments | Wealth if you prepay | Wealth if you invest | Better option |
|---|---|---|---|
| 8% a year | ₹61,19,684 | ₹59,29,472 | Prepay |
| 10% a year | ₹66,19,596 | ₹76,56,969 | Invest |
| 12% a year | ₹71,70,902 | ₹99,91,479 | Invest |
The break-even return
The two options give the same wealth when your investments earn about 8.4% a year. Below that, prepaying wins. Above it, investing wins. Notice that the break-even is close to the loan rate of 8.5%, which makes sense: prepaying is like earning your loan rate on that money, with no risk.
What this simple comparison leaves out
- Tax on gains. Investment returns are usually taxed, which lowers the real return. Interest saved on a loan is not taxed.
- Tax benefits on the loan. Under the old tax regime, interest on a home loan can qualify for a deduction, which lowers your effective loan rate. Under the new regime it does not. Use the income tax calculator to see which regime you are in.
- Risk. The loan saving is certain. A return of 12% is an assumption, and markets can fall for years.
- Liquidity. Money put into a loan cannot be taken out again. Invested money can be.
A sensible way to decide
- Build an emergency fund first (see our guide on how much emergency fund you need).
- If your loan rate is higher than the return you can realistically expect after tax, prepay.
- If it is lower and you will not panic when markets fall, investing may suit you, ideally through a SIP.
- Many people split the extra money between both, which gives some certain saving and some growth.
You can test your own loan with the EMI calculator, and compare other big choices with the rent vs buy calculator.
Keep reading
- Home Loan EMI Formula: How to Calculate EMI (With a ₹25 Lakh Example) — Loans, 6 min read
- How Much Emergency Fund Do You Need? A Simple Formula — Money basics, 6 min read
- The 50-30-20 Budget Rule for India: How to Use It on Your Salary — Money basics, 6 min read
- SIP vs FD vs PPF: Where Should ₹10,000 a Month Go? — Investing basics, 7 min read
Frequently asked questions
Is it better to prepay a home loan or invest?
It depends on your loan rate and the return you can expect after tax. In our example, the two options break even at about 8.4% a year, so investing wins only above that, and with risk.
Should I prepay to reduce EMI or tenure?
Reducing the tenure usually saves more interest in total, because you keep paying the same EMI. Reducing the EMI gives lower monthly payments and more cash flow, but saves less interest overall.
Are there prepayment charges on home loans?
Under the RBI’s Pre-payment Charges on Loans Directions, 2025, lenders covered by the rules cannot charge prepayment penalties on floating-rate loans to individuals for non-business purposes, for loans sanctioned or renewed on or after 1 January 2026. Check your own loan agreement for the exact terms.
Does prepaying affect my tax benefit?
It reduces the interest you pay, so the interest deduction (available only in the old regime) also becomes smaller. The money you save in interest is usually still larger than the tax you lose.
Sources: RBI — Pre-payment Charges on Loans Directions, 2025 · SEBI Investor Website