Finance Formula • Published on September 04, 2026 • Last updated September 04, 2026
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Outstanding balance remaining on home loan or mortgage ($P_{\text{loan}}$)
Annual interest rate charged on borrowing ($R_{\text{loan}}$)
Surplus capital allocated to reducing loan balance ($P_{\text{prep}}$)
Annual compounded return expected from Equity Mutual Fund SIP ($R_{\text{SIP}}$, e.g. 12%–14%)
Investment horizon matching the original or reduced loan amortization timeline ($m$)
The Loan Prepayment vs Investment decision is a classic corporate finance and personal wealth dilemma. Prepaying a debt provides a guaranteed, risk-free return equivalent to the effective post-tax loan interest rate (e.g., 8.5%–9.5%).
In contrast, investing surplus capital into a diversified Equity SIP targets a higher expected historical return (12%–14%), but carries market volatility risk. This formula quantifies the mathematical wealth difference between total interest saved versus terminal investment compounding.
Prepaying is mathematically superior when: (1) Loan interest rate is very high (above 10%–11%), (2) You are near retirement and need guaranteed cashflow peace of mind, or (3) Your alternative investments yield low returns (e.g. FDs yielding 6.5%–7% taxable).
No. Under Reserve Bank of India (RBI) guidelines, banks and Housing Finance Companies (HFCs) cannot charge any foreclosure or prepayment penalties on floating-rate home loans availed by individual borrowers.
A popular financial strategy is the 50:50 Rule: Allocate 50% of annual bonuses or surplus savings toward home loan principal reduction, and the remaining 50% toward an equity index SIP. This steadily brings down debt while compounding long-term wealth.
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