SIP vs Lump Sum
Putting money in all at once and spreading it over months each have a case. The data and your own behaviour both matter.
- In markets that rise over time, money invested earlier has longer to grow, so lump sum often ends higher.
- A SIP spreads the risk of investing everything just before a fall.
- The best plan is the one you can stick to through a bad year.
How they differ
A lump sum puts the full amount to work on day one. A SIP (systematic investment plan) invests a fixed amount every month, buying more units when prices are low and fewer when they are high, which is called rupee cost averaging.
What past data usually shows
When an index rises over the long run, a lump sum invested at the start has more time in the market, so across many past start dates it has often ended higher than a SIP of the same total. But in the periods that began just before a big fall, the SIP did better and felt much easier to hold. The SIP Strategy Tester lets you compare both on the real NAV history of any fund.
For most salaried investors
Income arrives monthly, so a SIP is often the natural choice rather than a choice against lump sum. If you do have a large amount, some people split the difference by spreading it over 6 to 12 months.
Common mistakes
- Stopping a SIP during a fall, which is when it buys the most units.
- Judging a SIP by its absolute return instead of its XIRR.
- Waiting for the perfect moment to invest a lump sum and staying in cash for years.
Common questions
Is SIP better than lump sum?
Not always. In rising markets a lump sum has often ended higher because the money was invested longer. A SIP reduces the risk of investing everything just before a fall.
What is rupee cost averaging?
Investing a fixed amount regularly, so you automatically buy more units when prices are low and fewer when they are high.
How do I compare SIP and lump sum for a fund?
Use the SIP Strategy Tester: it runs a regular SIP, a step-up SIP and a lump sum on the same fund and dates using real NAVs.