Rolling Returns: Judging a Fund Across Many Periods

Most fund pages show trailing returns: the return over the last one, three or five years, ending today. That is useful, but it depends entirely on where today happens to fall.

If the market is near a high today, trailing returns look strong. If it just fell, they look weak. The same fund can seem excellent one month and ordinary the next. Our page on CAGR explains why the dates matter so much.

Rolling returns take a fixed length, say three years, and calculate the return for every three-year period in a longer history. The first period might start in January of one year, the next in February, and so on.

The result is not one number but a set of numbers, often shown as a chart or as minimum, maximum and average figures.

Consistency: how often the fund delivered decent returns across different periods.

Range: the best and worst outcomes an investor could have had, depending on when they invested.

Typical experience: the average or median result, which is often more realistic than a single headline figure.

Trailing returns look at one period ending today. Simple, but sensitive to timing.

Rolling returns look at many periods across history. More work, but a fairer picture of how the fund behaves over time.

Use trailing returns for a quick look. Use rolling returns when you want to judge consistency.

Two funds may show similar five-year trailing returns. But rolling returns might show that one fund was consistently decent while the other swung between very good and very poor periods.

Many investors prefer the more consistent fund, because it is easier to stay invested in. Our page on Sharpe ratio and standard deviation covers related measures of steadiness.

The most useful rolling return comparison is against the fund own benchmark. How often did the fund beat its benchmark across all the three-year periods?

A fund that beat its benchmark in most periods shows more consistent management than one that beat it only in a few. Our page on the benchmark explains which index each fund is compared with.

Imagine a fund whose five-year trailing return today looks excellent because the market just had a strong year. Its rolling returns, however, show that in many earlier five-year periods it barely beat inflation.

Another fund looks only average today, but its rolling returns show steady, decent results in almost every period. The second fund may be the more reliable one, even though its headline number is smaller.

For equity funds, three-year or five-year rolling periods are common, because equity needs time. One-year rolling returns for equity can swing a lot and say little about the long term.

For debt funds, shorter rolling periods can be useful, matched to how long you plan to hold. The right length is roughly the time you expect to stay invested.

Pay special attention to the lowest rolling returns. They show what the worst experience would have been for someone who invested at an unlucky time. If you could not have lived with that, the fund may be too volatile for you, however good its average looks.

Some fund house websites and research platforms show rolling returns charts. They are less common on basic fact sheets.

Our backtest tool lets you look at historical periods yourself, and our Nifty calendar year returns page shows how the market moved year by year.

Rolling returns are usually calculated for a lump sum invested at the start of each period. A SIP experience is different, because money goes in every month.

For your own SIP, XIRR is the right measure, as our page on XIRR explains. Rolling returns are best for judging the fund itself.

For an index fund, rolling returns mostly show how the market itself behaved, since the fund simply follows its index. They are still useful for understanding the range of outcomes over different periods.

For active funds, rolling returns compared with the benchmark reveal whether the manager consistently added value.

Rolling returns describe what happened across past periods. They do not predict the next period. A fund that was consistent for ten years can still have a poor few years ahead.

We do not publish return projections. Use rolling returns as a way to understand past behaviour, alongside costs, the fund manager record and whether the fund suits your goal.

• Pick funds in the same category.
• Look at three or five-year rolling returns over a long history.
• Check the worst periods: could you have lived with them?
• See how often each fund beat its benchmark.
• Prefer consistency over a single great period.

Our page on alpha and beta adds another view of risk and skill.

• Trailing returns: one period, sensitive to dates.
• Rolling returns: many periods, a fairer view of consistency.
• Use them to compare funds and check how often they beat their benchmark.
• Not a forecast, just a clearer picture of the past.

We are distributors rather than investment advisers and we recommend no schemes. If you want help comparing funds properly, get in touch.