Lump Sum or Spread Over 12 Months? What 13 Years of Fund History Shows
We tested every start month since 2013 across six fund categories: money put in at once versus the same money spread over 12 monthly parts. Putting it in at once finished ahead in roughly three out of four five-year windows. Here is what that does and does not tell you.
By FinResp Research · Published 12 Oct 2026
The question we asked
Someone has a sum of money to invest in a mutual fund. Do they put all of it in on day one, or spread it over 12 equal monthly parts and keep the rest in cash meanwhile?
We answered it with history. For every fund in a category and every start month from January 2013, we compared two things valued on the same last day: the whole sum invested at the start, and the same sum invested in 12 equal monthly parts (money not yet invested earns nothing). The answers are pooled by category.
What the numbers say
For a five-year holding period, the lump sum finished ahead of the 12-month spread in these shares of windows: large cap 76%, ELSS 74%, flexi cap 74%, aggressive hybrid 75%, mid cap 72%, small cap 72%.
For ten years the shares are higher, 77% to 86% depending on the category.
The reason is simple. Markets rose in most of these windows, and money that waits in cash misses part of the rise. When markets fell right after the start, spreading did better.
Where the lump sum lost money
Over five years, the lump sum ended below the amount put in in a small share of windows: about 0.2% for large cap, 0.4% for flexi and mid cap, 1.4% for aggressive hybrid and 3% for small cap.
Over ten years none of the six categories had a losing window in this data. Small cap was the weakest, with a worst ten-year result of about 3.5% a year.
These are rare events, but they are not zero, and small cap carried the most.
Why this does not settle the question
Closed and merged funds are missing. Only funds that exist today are in the data. Funds that did badly and were shut or merged are not counted, which makes every number above look better than the full picture.
One long rising period. Thirteen years is a single market era. A long fall would look different.
Overlapping windows. Start months next to each other share almost all of their history, so 106 windows are far fewer than 106 independent tests.
Not included: taxes, exit loads, and what you would earn on cash while it waits. If the waiting money sits in a savings account or an FD instead of earning nothing, the gap shrinks.
How to read this
The data says that, on average and in this period, waiting did not pay. It does not say a lump sum is right for you. The question for a person is usually not the average outcome but how they would feel and act if the value fell by a fifth in the first year.
If a fall like that would make you stop and sell, the cost of spreading is a lower average result, and the benefit is a lower chance of a bad start. That trade-off is yours to weigh. FinResp analyses. You decide.
You can run the same comparison for a category and a period of your choice in our Lump Sum and SIP tools. Past results do not predict future ones.
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