Should you invest in SIP or prepay your loan? Free calculator compares both options and gives a data-driven recommendation.
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Every salaried person with both a home loan and monthly savings faces this question: should the surplus go toward repaying the loan early, or toward building long-term wealth through monthly SIP investments? This is one of the most discussed personal finance questions in India — and the mathematically correct answer is more nuanced than most people realise.
The Fundamental Principle:
If Expected Investment Return > Effective Loan Rate → Invest in SIP
If Effective Loan Rate > Expected Return → Prepay the loan
"Effective" means after adjusting for all applicable taxes.
Home loan at 8.5% → Section 24 interest deduction (30% tax slab):
Effective loan rate = 8.5% × (1 − 0.30) = 5.95% after tax
Equity SIP historical return: 12–14% per annum over 10+ years
LTCG tax at 12.5% on gains above ₹1.25L per year: ~11–13% after tax
Decision at these rates: SIP clearly wins mathematically
High-rate loans (above 10%): Personal loans at 14–18%, consumer loans at 18–24%, credit card debt at 36–42% — for any of these, prepayment provides a guaranteed, risk-free return equal to the rate avoided. No equity investment offers this kind of guaranteed return. Prepay aggressively.
Risk-averse investors: SIP returns are variable and market-linked. Your home loan interest is fixed and certain. For investors who lose sleep during market corrections, the psychological value of debt freedom justifies prepayment even when the mathematical case for SIP is strong.
Near retirement: With 5–7 years to retirement, debt freedom provides certainty of no EMI obligations in retirement. This security often outweighs the mathematical argument for continuing SIP in late career.
Low-rate home loans (below 8.5%): After Section 24 deduction, the effective cost drops to 5–6% for taxpayers in the 30% bracket. Equity SIPs have historically returned 12–14% over 15+ year periods. The 6–8% differential compounds to a very large advantage over a 20-year period.
Early career investors: Time is the most powerful factor in compound growth. A 30-year-old investing ₹10,000/month for 25 years at 12% accumulates ₹1.89 crore. The same investor prepaying instead of investing for 10 years, then investing for 15 years, accumulates far less due to the lost compounding years.
For home loans between 8.5–10%, neither pure prepayment nor pure SIP is clearly dominant when all factors are considered. The recommended approach for most borrowers: allocate 40–50% of monthly surplus to home loan prepayment (reducing tenure) and 50–60% to equity SIP. This combines mathematical optimisation with psychological comfort, captures debt reduction and wealth creation simultaneously, and leaves flexibility to adjust as rates and market conditions change.
Before allocating any surplus to either SIP or prepayment, ensure you have an emergency fund of 3–6 months of household expenses (including EMIs) in a liquid instrument — savings account, liquid mutual fund, or short-term FD. Without this buffer, a medical emergency or job loss could force you to either miss loan payments (damaging credit) or liquidate investments at the wrong time. The emergency fund is not a competing use of money — it is a prerequisite that makes both SIP and prepayment strategies sustainable.
When making a home loan prepayment, specify to your bank whether you want the prepayment to reduce your tenure (keeping EMI the same) or reduce your EMI (keeping tenure the same). For most borrowers, reducing tenure is more beneficial — it shortens the debt obligation period and saves more total interest. Most banks default to EMI reduction if not specified. Always confirm this in writing with your bank before each prepayment transaction.