Prepay the Loan or Invest?
Compare putting spare money against your loan with investing the same money in a SIP — judged over the same number of years, with the EMI you free up counted in.
Your loan
The money you are deciding about
Over and above the EMI
A bonus or maturing deposit
An assumption, not a promise
Prepay the loan
The surplus goes against the loan until it clears, then the whole ₹41,035 is invested for the years that remain.
- Loan clears in
- 8 years 8 months
- Interest paid
- ₹12,41,128
- Invested after that
- ₹56,07,200
Worth at the end of 20 years
₹1.20 Cr
Invest the surplus
AheadThe loan runs its full term on the normal EMI, and the surplus goes into a SIP from month one.
- Loan clears in
- 20 years
- Interest paid
- ₹32,48,327
- Total invested
- ₹36,00,000
Worth at the end of 20 years
₹1.50 Cr
Investing is ahead by ₹29.89 L after 20 years.
At an assumed 12% against a loan rate of 8.5%, the surplus works harder invested. That gap only exists if the 12% actually materialises and you stay invested through the falls — drop the assumption to 8.5% and the two are identical. Prepaying still buys certainty and a debt-free household 11 years 4 months sooner.
All figures are pre-tax. This does not model Section 24(b) interest relief, 80C principal relief, or capital-gains tax on redemption — each can move the answer. It is a comparison, not financial advice.
EMI Calculator
Your EMI plus the full year-by-year repayment schedule and prepayment savings.
SIP Calculator
Estimate what a monthly investment grows to on its own, without a loan in the picture.
About the Prepay Loan vs Invest Calculator
You have spare money and a loan running: pay it down, or invest it? Prepaying earns a guaranteed, tax-free saving equal to your interest rate. Investing may beat that, but only if post-tax returns actually exceed the rate — and only if you hold through the volatility on the way. This free calculator runs both strategies side by side over the same years, spending identical money every month in both, so the finish-line comparison is fair. Home-loan holders agonising over bonuses and personal-loan borrowers counting every rupee get the same honest arithmetic, entirely in-browser.
The one comparison that matters
Strip away opinions and one equation remains: prepaying a loan at R% is financially indistinguishable from earning a guaranteed, tax-free R% on that money, because every rupee prepaid permanently cancels interest you would otherwise have paid. Investing therefore wins only if the expected post-tax return clears your loan rate — and clears it by enough to justify accepting risk. Against a 9% home loan, a bank FD paying 7% loses clearly, especially after tax: in the 20% slab that FD nets about 5.6%. An equity fund assumed at 12% offers a two-point cushion, which is meaningful over fifteen-plus years but arrives attached to drawdowns that regularly reach 20–30%. At exactly your loan rate the two paths tie on paper — and since one side of the tie is certain while the other is hoped-for, many households reasonably treat a tie as a vote for prepaying.
Why many comparisons mislead — and how this one stays fair
The usual mistake compares interest saved against the SIP corpus while forgetting the freed-up EMI. When aggressive prepayments close your loan years early, the entire EMI becomes investable surplus for every remaining year — ignore it and the comparison quietly rigs itself in favour of staying invested. Here, both strategies spend an identical monthly budget — your EMI plus your surplus — for the whole original tenure. In the prepay path the loan closes early and the freed budget is invested for the years left; in the invest path the loan runs full term while the surplus enters the SIP from month one. Both end at the same finish line, so net worth is compared like for like. Honesty about limits matters too: all figures are pre-tax, and Section 24(b) interest relief, 80C principal benefits and capital-gains tax on redemption are deliberately not modelled — each can shift the answer in your situation.
Before you decide
Sequence matters more than optimisation. Build an emergency fund first — six months of expenses somewhere reachable — because money pushed into a loan is very hard to pull back out, while a mutual fund redeems in days. Next, know your rate: personal loans and credit-card EMIs at 14–24% make prepaying close to automatic; home loans near 8.5–9.5% create the genuine dilemma worth calculating carefully. Tax positions tilt things further — claim home-loan deductions under the old regime and your effective prepay return drops below the headline rate. Many households ultimately split the surplus between both goals, capturing some certainty and some upside at once. And whatever you choose, re-run the numbers whenever your rate, tenure or surplus changes, because the break-even moves with them. This tool provides education, not financial advice.
Real numbers, start to finish
The decision compresses neatly into rates. Say your outstanding home loan charges 9% and you have ₹10,000 of spare monthly income. Three destinations compete for that money, each with a different character of return:
| Destination | Return used | Guaranteed? | Illustrative verdict |
|---|---|---|---|
| Prepay the loan | 9% — the loan rate itself | Yes — it is interest never paid | Baseline: certain and tax-free |
| Bank FD | 7% pre-tax; ≈ 5.6% post-tax at the 20% slab | Yes (rate fixed for the term) | Loses to prepaying by ≈ 3.4 points |
| Equity fund SIP | 12% expected — not promised | No | May win over long horizons; volatile path |
Same spare money, three destinations (illustrative rates)
Against the FD, prepaying wins outright — 9% certain beats 5.6% certain, no debate. Against equity, the two-point edge exists only if the 12% materialises and you stay invested through every fall; shorten the horizon or shade the assumption downward and the edge evaporates. That asymmetry — certain versus conditional — is the entire decision. Rates shown are illustrative; your loan rate and tax slab set your own numbers.
Video slot: prepay-vs-invest-walkthrough.mp4
Entering a running home loan with ₹15,000 spare monthly, moving the expected-return field from 8.5% to 13% to show the verdict flip at the break-even, and pointing out the freed-EMI line inside the prepay card.
Coming soonHow to Use Prepay Loan vs Invest Calculator Online
Follow these simple steps to use Prepay Loan vs Invest Calculator securely in your web browser.
- 1
Enter Loan Details
Type remaining principal loan amount, interest rate (%), and tenure.
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- 2
Enter Investment Surplus
Type or enter available monthly surplus cash and choose expected mutual fund return rate.
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- 3
Click to Calculate Net Worth
Click compare to calculate guaranteed interest saved versus compounded investment returns.
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Features & Specifications
Comparison Scope
Guaranteed Loan Interest Saved vs Compounded Equity SIP
Horizon
Remaining Loan Tenure
Privacy Status
100% In-Browser Local Processing
100% Free & Private In-Browser Processing
Rupix operates on a zero-upload architecture. All computations, file parsing, and transformations occur locally inside your web browser. No document bytes, sensitive text, or personal data are ever uploaded or transmitted to remote servers.
Why use Rupix Prepay Loan vs Invest Calculator?
Dual Strategy Comparison
Side-by-side simulation of loan interest savings versus compounded market returns.
Freed EMI Effect
Models reinvesting former EMI payments into investments once the loan is paid early.
Net Wealth Projection
Clear summary of which strategy yields higher final net worth.