Home Loan Prepayment: Close Early or Invest the Money? A Calculator and the Simple Rule That Decides It

Home loan prepayment calculator

The one rule that settles the debate

When you prepay ₹1 of a loan charging 8.25%, you stop paying 8.25% on that rupee for the rest of the loan. That is exactly like earning a guaranteed 8.25%, with no tax on it and no risk. So the real question is:

Can you earn more than your loan rate, after tax, on the same money, with a risk you can live with?

• An FD or debt fund at 6.5–7.5%, taxed at your slab: no. Prepaying wins.
• An equity fund over 10+ years: historically often yes, but not guaranteed, and some years will be negative.
• If you are in the old tax regime and use the full interest deduction, your effective loan rate is lower. At a 30% slab, an 8.25% loan costs about 5.8% after tax on the interest that is deductible, which makes investing more attractive.

Our calculator shows this directly. In the example, if the money earns exactly the loan rate (8.25%), investing it and prepaying it end up equal, about ₹22 lakh either way at the end of 18 years. At 10% a year, investing comes out about ₹7 lakh ahead; at 12%, about ₹19 lakh, before tax on gains, and only if those returns actually arrive.

Reduce tenure or reduce EMI?

When you prepay, the lender asks whether to cut the EMI or the remaining years. Our example: ₹40 lakh outstanding at 8.25%, 18 years left, EMI about ₹35,600, prepayment ₹5 lakh.

The chart above shows the same comparison. Cut the tenure unless your monthly budget genuinely needs the lower EMI, for example after a job loss or a big new expense.

When prepaying clearly makes sense

• Your job or income feels uncertain, and a smaller loan would let you sleep better.
• You are in the new tax regime, so the loan gives you no tax benefit.
• Your loan rate is high compared with what your safe investments earn.
• You are within 10 years of retirement and want to be debt-free by then.
• You already have an emergency fund of at least six months' expenses, and term and health insurance.

When investing may be better

• You have many years left on a loan at a moderate rate, and you invest steadily in equity for the long term.
• You are in the old regime and use the full interest deduction.
• You do not yet have an emergency fund or retirement savings; build those first, because a prepaid loan cannot be withdrawn in an emergency.

A sensible middle path for most families: keep the EMI going, run a SIP for long-term goals, and put annual bonuses, increments or windfalls towards prepayment.

Rules you should know

• No prepayment charges: RBI directions effective 1 January 2026 bar regulated lenders, including banks and NBFCs, from charging prepayment fees on floating-rate loans to individuals for non-business purposes, for part or full prepayment, with no lock-in. Fixed-rate loans may carry charges; check your sanction letter.
• Tax: the old regime allows up to ₹2 lakh a year of interest deduction on a self-occupied home and principal within the ₹1.5 lakh Section 80C limit. The new regime gives no deduction for a self-occupied home. Under the new regime, income up to ₹12 lakh is effectively tax-free anyway.
• Rate hikes: RBI raised the repo rate to 5.50% in October 2026. On a ₹30 lakh, 20-year loan, a 0.25-point rise adds roughly ₹470 to the EMI, or extends the tenure if the EMI is kept unchanged. Watch your statement for tenure creeping up.

If your rate is too high: reset or transfer

Borrowers on older loans are sometimes left on a higher rate than new customers get. If your rate is well above your lender's current rate:

1. Ask for a reset to the current rate. Many lenders allow existing borrowers to switch for a conversion fee.
2. Compare a balance transfer to another lender, counting processing fees, legal and valuation charges, and stamp duty on the new mortgage.
3. Act if the saving is meaningful: a gap of about 0.5 percentage points or more on a large balance with many years left usually justifies the effort.

Final word

There is no single right answer to "prepay or invest", but there is a clear way to decide. Your loan rate is the guaranteed return on prepaying. If your alternative earns less, or the loan keeps you awake at night, prepay and cut the tenure, not the EMI. If you have long years ahead, a moderate rate and the discipline to stay invested through market falls, investing can do better. Most families do best with both: steady investing, and every windfall towards the loan.

This guide and calculator are general information, not financial or tax advice. Loan terms, interest rates and tax rules change, and investment returns are not guaranteed. Check your loan agreement and consult a chartered accountant or SEBI-registered adviser for your situation.