SIP vs Lumpsum Comparison Calculator

Rupee cost averaging means your SIP buys more mutual fund units when prices are low and fewer when prices are high. Over time, this averages out your purchase cost. For example, if NAV drops from 100 to 80, your SIP of Rs 10,000 buys 125 units instead of 100. When market recovers, those extra units generate higher returns. This is SIP's biggest advantage over lumpsum in volatile markets.

In a steadily rising market, lumpsum mathematically always beats SIP because all your money compounds from Day 1. Historical data shows lumpsum outperforms SIP about 65-70% of the time over 10+ year periods. However, SIP outperforms during volatile periods, market corrections, and bear markets. The key difference is risk — SIP has lower downside risk due to averaging.

STP (Systematic Transfer Plan) combines benefits of both strategies. You invest your lumpsum in a liquid/debt fund earning 6-7%, then auto-transfer a fixed amount to equity fund monthly. Your idle money earns returns while you get SIP-like averaging. STP gives roughly 0.5-1% higher returns than pure SIP because the un-invested portion keeps growing in debt fund.

In low volatility (large cap / index funds), lumpsum almost always wins. In medium volatility (flexi cap / mid cap), the difference narrows significantly. In high volatility (small cap / sectoral funds), SIP often wins due to aggressive averaging — buying many more units during sharp corrections. Choose SIP for volatile funds and lumpsum for stable, upward-trending markets.

For a windfall like a bonus, the best approach is STP (Systematic Transfer Plan). Park Rs 10 lakh in a liquid fund and set up monthly transfers of Rs 80,000-1,00,000 to your equity fund over 10-12 months. If markets correct 10-15% during this period, you can accelerate the transfer. This gives you lumpsum returns on the idle portion plus SIP's averaging protection.