Same Fund, Ten Investors, Ten Different Returns
Why the return you see depends entirely on the day you happened to look
Ten investors put money into the same fund. Same scheme, same fund manager, same portfolio. The only thing that differed was the month each of them invested. Five years later, their CAGRs ranged from 8.4% to 22.1%. Nobody picked a bad fund. They simply picked a different starting line.
A fund's fact sheet usually shows one number: the point-to-point return from a fixed start date to today. That number is accurate. It is also, on its own, close to meaningless for judging what any individual investor is likely to experience, because it depends entirely on when the clock started.
This newsletter looks at rolling returns: what they are, why they give a far more honest picture of a fund's consistency, and how to read one before you invest.
SECTION 1: WHAT A ROLLING RETURN ACTUALLY IS
A point-to-point return picks two dates, a start and an end, and calculates the CAGR between them. A rolling return does the same calculation repeatedly, sliding the start date forward one period at a time, so that every possible entry point gets its own return.
| Measure | What It Calculates | What It Tells You |
|---|---|---|
| Point-to-point | CAGR between one fixed start date and today | How the fund did for someone who invested on that exact date |
| Rolling return | CAGR for every possible start date within a window, calculated repeatedly | How the fund did for an investor no matter when they entered |
SECTION 2: WHAT THE HEADLINE NUMBER HIDES
Consider a fund with a 5-year point-to-point CAGR of 16.8% as of today. On its own, that number looks strong.
The headline 16.8% is real, but it is just one point on a much wider spread. Depending on the month an investor actually entered, the same fund delivered anywhere from 8.4% to 22.1% CAGR over a 5-year holding period. The median outcome, 14.2%, is a more honest expectation than the single number on the fact sheet.
Now look at what every 5-year rolling window over the last decade actually produced:
SECTION 3: WHY ROLLING RETURNS TELL THE TRUTH
A single point-to-point number is vulnerable to two things a rolling return automatically corrects for:
Start-date luck. If the fixed start date happened to fall right after a market crash, the point-to-point return looks unusually strong. If it fell right before a crash, it looks unusually weak. Neither says much about the fund's actual skill.
Cherry-picking. A fact sheet can always be pulled on the date that makes the number look best. A rolling return cannot be cherry-picked in the same way, because it already accounts for every possible date.
SECTION 4: READING A ROLLING RETURN CHART
Once plotted, a rolling return chart shows the fund's 3-year (or 5-year) CAGR recalculated every month over a long history. Here is what that looks like in practice:
What to Look For
A tight band around the average suggests consistency. A wide swing between deep troughs and sharp peaks suggests a fund that depends heavily on timing. The percentage of rolling windows that stayed above a benchmark or above zero is often more useful than the single best or worst window.
SECTION 5: HOW TO CHECK IT YOURSELF
Rolling return data for most mutual funds is available through AMC fact sheets, AMFI, and most fund research platforms. A basic check does not require building a model from scratch.
The Rolling Returns Checklist
Look up the fund's 3-year and 5-year rolling returns over at least the last 7 to 10 years, not just the headline point-to-point figure. Check the minimum, median, and maximum of the rolling range, not just the average. Compare the percentage of rolling windows where the fund beat its benchmark. Be more cautious of funds where the rolling range is very wide relative to the median, since that signals inconsistency.
THE FINIDEAS TEST
THE FINIDEAS TEST
An investor checks a fund's 5-year point-to-point return before investing. What does this number NOT tell them?
- A) The fund's expense ratio
- B) Whether that return held up no matter which month they had actually invested
- C) The fund manager's name
- D) The fund's AUM
Answer (read reversed): B rewsnA
PREVIOUS ISSUES IN THIS SERIES
| Issue | Topic |
|---|---|
| 01 | Direct vs. Regular Mutual Funds |
| 02 | The Past Returns Trap |
| 03 | Understanding Drawdowns |
| 04 | Risk-Adjusted Returns and the Sharpe Ratio |
SECTION 6: THE BOTTOM LINE
A point-to-point return answers one narrow question: how did this fund do from one specific date to another. A rolling return answers the question every investor actually cares about: how would this fund have treated me, whenever I happened to invest.
Ten investors, one fund, ten different outcomes. The rolling return is what tells you how wide that gap really is.
Before investing on the strength of a single headline return, pull up the rolling return chart. It takes the luck of timing out of the picture and shows what the fund has actually delivered, consistently, across every entry point history has offered it.
