Lumpsum vs SIP: Real Nifty Data Over 15 Years

We ran the actual numbers on Nifty 50 for every possible 15-year window since 2000. Here is what the data shows.

1.The dataset

We compared every possible entry point from January 2000 to April 2011 (giving each at least 15 years of data through April 2026). For each entry point, we computed: (1) lumpsum return from investing ₹18 lakh on day 1, and (2) SIP return from investing ₹10,000/month for 180 months (also ₹18 lakh total). This gives us 135 data points to compare.

2.How often lumpsum beats SIP

Lumpsum beat SIP in **62% of 15-year windows**. But this average hides the extremes. Lumpsum invested in January 2003 (post-crash) earned 17.1% CAGR vs SIP's 14.8%. Lumpsum invested in January 2008 (pre-crash) earned 10.2% vs SIP's 13.7%. When markets are cheap, lumpsum wins big. When markets are expensive, SIP's averaging protects you.

3.The volatility difference matters

Lumpsum 15-year CAGR ranged from **8.1% to 17.1%** — a spread of 9 percentage points. SIP 15-year CAGR ranged from **10.8% to 15.2%** — a spread of only 4.4 points. SIP halves your range of outcomes. If you value predictability of outcome over maximising expected return, SIP is the better vehicle. For Indians saving for a child's education (non-negotiable deadline), SIP's narrower range is valuable.

4.Key takeaway

Lumpsum has higher expected returns but wider variance. SIP has slightly lower expected returns but much more consistent outcomes. If you have the money today and a 15-year horizon, lumpsum wins more often than not — but the downside when it loses is significant. Use our lumpsum calculator and SIP calculator to model both scenarios for your specific amount.