SIP vs Lump Sum: Equal Contributions, Different Investment Timing
Examples reviewed 15 September 2026. Calculated from the same engines used by the linked tools.
A SIP invests money at regular intervals; a lump sum invests available money at once. Equal total contributions do not mean equal time invested. Money saved from future salary is not available for an upfront investment today.
Ten-year illustration
Invest INR5,000 at each month end for ten years, or INR600,000 at the start. Both assume an 8% nominal annual return compounded monthly. Uninvested cash earns nothing in this illustration.
| Measure | Monthly SIP | Initial lump sum |
|---|---|---|
| Total invested | ₹6,00,000.00 | ₹6,00,000.00 |
| Value after ten years | ₹9,14,730.18 | ₹13,31,784.14 |
| Illustrative growth | ₹3,14,730.18 | ₹7,31,784.14 |
How to interpret the difference
The lump sum has more time invested under this positive constant-return assumption. This does not show that either approach will outperform in a fluctuating market. A SIP changes purchase timing; it does not guarantee profit or eliminate loss.
Fees, taxes, inflation, market volatility and returns on uninvested cash are excluded. The 8% rate is a scenario assumption, not a forecast.
SIP vs lump sum: which is better in practice?
The lump sum only wins in the illustration because the return is constant and positive; with money already in hand, investing it at once has historically beaten spreading it out more often than not, but the margin is modest and the worst cases are worse. A SIP is not a strategy for money you already have so much as a description of how most people actually save, from monthly income, and its real advantage is behavioural: it removes the decision about timing and keeps buying through a fall, when a lump-sum investor is most likely to stop. If you have a lump sum and cannot bear the thought of investing the week before a drop, splitting it over six to twelve months costs a little expected return and buys a lot of peace. Either way, the total invested, the years in the market and the return assumption matter far more than the timing pattern, which is why the compound interest calculator lets you change all three.
Change the contributions and assumed return to examine your own scenario.