Neither a SIP nor a lumpsum investment is universally better — they simply do different jobs. Here is what actually changes when you invest a fixed sum every month instead of investing everything at once.
Lumpsum: all your money enters at today's price
If you invest ₹1,00,000 as a lumpsum, every rupee buys units at today's NAV. If the market rises steadily from here, a lumpsum captures the full move. If the market falls shortly after you invest, the entire amount feels that fall at once.
SIP: your money enters at many different prices
A Systematic Investment Plan spreads the same total amount across many purchase dates. In months when NAV is lower, your fixed instalment buys more units; in months when NAV is higher, it buys fewer. Over time, this averages your purchase price — commonly called rupee-cost averaging — and removes the pressure of picking a single "right" day to invest.
When each tends to suit an investor better
- SIP suits income that arrives monthly, and investors who would rather not time the market at all.
- Lumpsum suits money that has already arrived — a bonus, maturity proceeds, an inheritance — where spreading it out over many months means the balance sits idle in the meantime.
A blended approach is common
Many investors do both: a fresh lumpsum is sometimes staggered into a scheme over 3–6 months (a Systematic Transfer Plan, or STP, from a liquid fund), while ongoing monthly savings continue via a separate regular SIP.
