Why a lump sum usually wins on paper
Every dollar invested today has the maximum possible time to compound. An SIP invests the same total amount, but each installment starts compounding later than the last — so on average, across a steadily rising market, a lump sum invested immediately tends to end up ahead of the same money trickled in over time.
Why people choose SIP anyway
The math favors lump sum on average, but it assumes you're comfortable with the full amount being exposed to a downturn right away. Spreading it out trades some expected return for a smoother ride — a real trade-off, not just a smaller number. See the SIP Calculator for a step-up SIP, or the Compound Interest Calculator for a general lump-sum projection.
Frequently asked questions
Is a lump sum or SIP better?
In a steadily rising market, investing a lump sum today usually wins mathematically — the money starts compounding immediately instead of gradually over months or years. An SIP's advantage is spreading your entry across market ups and downs, which reduces the risk of investing everything right before a downturn.
When does SIP make more sense than a lump sum?
When you don't have the full amount available today, when markets are volatile or richly valued, or simply when spreading investments feels more comfortable than committing everything at once. It is as much a risk-management choice as a returns one.
Does this account for market timing risk?
No — both paths use the same constant assumed return for a clean comparison. In reality, a lump sum invested right before a downturn can underperform an SIP, and vice versa. This tool compares the average-case math, not the risk.
Can I combine both approaches?
Yes — many investors put a portion in as a lump sum and SIP the rest, balancing the higher expected return of investing early against the smoother risk profile of spreading it out.
Last updated: June 2026