Home Loan Prepayment vs Investment Calculator
Compare: Prepay your loan · Invest in SIP · Invest in FD — and see exactly which option builds more wealth
Equity mutual funds — market-linked, not guaranteed
Fixed deposit — quarterly compounding, capital safe
Original EMI
₹0
Original Total Interest
₹0
Total Loan Cost
₹0
Interest Saved
₹0
guaranteed savings
SIP Corpus
₹0
market-linked returns
FD Maturity Value
₹0
guaranteed, capital-safe
Calculating best option...
Visual Comparison
Track how each option performs over the loan tenure
Year-by-Year Comparison
Detailed breakdown: loan balance, interest saved, and investment growth
| Year | Loan Balance | Prepay Balance | Interest Saved ▲ | SIP Corpus | SIP Profit ▲ | FD Corpus | FD Profit ▲ |
|---|
What is the Home Loan Prepayment vs Investment Calculator?
This free online calculator helps Indian home loan borrowers answer one of the most important personal finance questions: Should you use your lumpsum (say ₹30 lakh) to prepay your home loan and save on interest, or invest it in a Systematic Investment Plan (SIP) or Fixed Deposit (FD) to earn returns?
The calculator compares three strategies side-by-side — loan prepayment on a reducing balance, lumpsum SIP investment in equity mutual funds, and lumpsum FD investment — and shows you exactly which option generates more wealth over your loan tenure, with an interactive year-by-year breakdown and charts.
The Three Options Explained
Prepay Home Loan
Use your lumpsum to reduce the outstanding principal. This immediately cuts the interest calculation base, saving guaranteed interest over the remaining tenure on the reduced balance.
Invest in SIP
Continue paying your original EMI while investing the lumpsum in equity mutual funds via SIP. Over 15–20 years, equity historically delivers 12–15% CAGR, potentially creating far more wealth.
Invest in FD
Park the lumpsum in a fixed deposit at 7–7.5% with quarterly compounding. Returns are guaranteed and capital is protected by DICGC up to ₹5 lakh, making this a risk-free but lower-return option.
How to Use This Calculator
- 1.Enter your current outstanding home loan amount (e.g., ₹50 lakh).
- 2.Set your loan interest rate and remaining tenure in years.
- 3.Enter the lumpsum amount you have available (e.g., ₹30 lakh from a bonus or windfall).
- 4.Adjust the SIP expected return rate (historical equity average: 12%) and FD interest rate.
- 5.Read the Winner Banner — it instantly tells you which option generates the most wealth.
- 6.Switch between "Final Outcome" and "Year-by-Year" charts to see how values grow over time.
Formulas Used
EMI (Reducing Balance)
EMI = P × r × (1+r)ⁿ / ((1+r)ⁿ − 1)
P = Principal, r = Monthly rate (Annual% ÷ 12 ÷ 100), n = Tenure in months
SIP Lumpsum Growth (Monthly Compounding)
FV = L × (1 + r_monthly)^(n_months)
L = Lumpsum invested, r_monthly = Annual SIP rate ÷ 12 ÷ 100
FD Maturity (Quarterly Compounding)
FV = L × (1 + r_fd/4/100)^(4×T)
T = Tenure in years, r_fd = FD annual interest rate
Practical Example: ₹30 Lakh Decision
Rahul has a home loan of ₹50 lakh at 8.5% for 20 years. He receives a bonus of ₹30 lakh. Here's what each option yields:
| Metric | Prepay ₹30L | SIP @12% | FD @7% |
|---|---|---|---|
| Lumpsum Used | ₹30 lakh (for prepay) | ₹30 lakh (invested) | ₹30 lakh (invested) |
| Remaining Loan | ₹20 lakh | ₹50 lakh (unchanged) | ₹50 lakh (unchanged) |
| Monthly EMI | ~₹17,547 (reduced) | ~₹43,867 (original) | ~₹43,867 (original) |
| Net Benefit at End | ~₹26.2L saved | ~₹2.59 Cr profit | ~₹86L profit |
| Verdict | Safe, guaranteed savings | ★ Maximum wealth creation | Better than prepay if FD > loan rate |
* Example values are approximate. Use the calculator above for exact figures based on your inputs.
The Advantage of Taking a Home Loan
Many first-time buyers assume using all their savings to minimise the loan is the smartest move. But financial leverage — borrowing at a lower rate and investing at a higher rate — is a well-established wealth creation strategy.
Tax Benefits of a Home Loan
- •Section 24(b): Deduct up to ₹2 lakh/year on interest (self-occupied property)
- •Section 80C: Deduct up to ₹1.5 lakh/year on principal repayment
- •Section 80EEA: Additional ₹1.5 lakh interest deduction for affordable housing
Effective Loan Cost After Tax
- •Loan rate 8.5% → Effective ~5.95% at 30% tax slab
- •SIP in equity at 12% CAGR yields ~10.2% post-LTCG tax (10% on gains above ₹1L/year)
- •Net spread: ~4.25% per year in investor's favour
Key Insight: When your expected investment return (after tax) exceeds the effective home loan interest rate (after tax deductions), keeping the loan and investing creates more wealth. This is the core advantage of leveraging a home loan — the government effectively subsidises part of your borrowing cost through tax deductions.
When Should You Prepay vs Invest?
Prepay your loan when:
- ✓ You're close to retirement and want to be debt-free
- ✓ Your loan rate exceeds 9% and you have no SIP discipline
- ✓ You've already maxed tax benefits under 24(b) and 80C
- ✓ You're risk-averse and prefer guaranteed peace of mind
- ✓ Your loan is in its early years (high interest component)
Invest in SIP when:
- ✓ You have 10+ years of tenure remaining
- ✓ Your loan rate is below 9% (post-tax ~6%)
- ✓ You have strong risk appetite and investment discipline
- ✓ You're below 45 and building long-term wealth
- ✓ You still have unutilised tax benefits under Section 24(b)
Frequently Asked Questions
Is it better to prepay a home loan or invest in SIP?
If your expected SIP return (historically 12-15% for equity) exceeds your loan's effective interest rate (8.5% loan → ~5.95% after 30% tax), investing in SIP mathematically wins over long tenures. However, this depends on consistent SIP discipline and risk tolerance. For risk-averse borrowers, prepayment provides guaranteed, emotion-free savings.
Should I use ₹30 lakh bonus to prepay home loan or invest?
For ₹30 lakh invested in SIP at 12% over 20 years, the corpus grows to approximately ₹2.89 crore (profit ≈ ₹2.59 crore). Prepaying ₹30 lakh on a ₹50 lakh loan at 8.5% for 20 years saves approximately ₹26 lakh in interest. The numbers clearly favour SIP if you can sustain 12% returns and have remaining tenure of 15+ years. Use our calculator above with your exact numbers for a personalised answer.
Is FD interest more than home loan interest? Should I invest in FD instead of prepaying?
Usually no. Most home loan rates (8-10%) exceed FD rates (6-7.5%), making prepayment more beneficial than FD. However, before any prepayment, always maintain 6 months' expenses as an emergency fund in an FD or liquid fund. If your loan rate ever falls below the FD rate (rare), investing in FD makes sense.
What are the tax implications of prepaying a home loan?
Prepaying your home loan reduces your outstanding principal and interest, which in turn reduces the deduction available under Section 24(b) (up to ₹2 lakh on interest) and Section 80C (up to ₹1.5 lakh on principal). If you're currently utilising these deductions fully, prepaying can increase your taxable income, raising your net tax outgo. For high-income earners in the 30% slab, evaluate the tax impact before deciding.
How does reducing balance method work in home loans?
In the reducing balance (or diminishing balance) method, interest is calculated each month on the outstanding principal, not the original loan amount. As you pay EMI, the principal reduces, so the interest component decreases every month while the principal component increases. This is why home loans charge interest only on what you owe — making prepayment highly effective in early years when the outstanding balance is highest.