Cumulative return
What is Cumulative return?
Cumulative return is the total compounded gain or loss from the beginning to the end of a measurement period.
Why cumulative return matters
Cumulative return shows the complete change in invested value over the selected horizon and maps directly to a growth-of-one or VAMI chart. It avoids the smoothing introduced by annualization and makes the economic size of long-term gains or losses visible. Portfolio and benchmark cumulative returns are useful for identifying periods when relative performance diverged.
How it is calculated
Periodic returns are geometrically linked: multiply one plus each return and subtract one at the end. Adding returns is incorrect when compounding matters. A direct beginning-to-ending calculation can be used only when valuations, distributions, and external cash flows are handled consistently. Time-weighted subperiod returns are commonly linked for manager or strategy evaluation.
Example
A portfolio returns 10% in year one and negative 10% in year two. Its cumulative return is negative 1%, because 1.10 multiplied by 0.90 equals 0.99. Adding the two returns incorrectly produces zero. To recover from a 10% loss, the portfolio needs an 11.11% gain on the smaller capital base.
How to interpret it
State the start date because cumulative results are highly endpoint-dependent. Display portfolio and total-return benchmark on the same dates and currency. A strong cumulative gain can coexist with a severe interim drawdown. Examine the return path, rolling periods, cash-flow method, and annualized result before drawing conclusions about consistency or investor experience.
Limitations
Cumulative return grows mechanically with the length of a successful record and is therefore unsuitable for comparing unequal horizons without additional context. It hides risk, timing of external cash flows, and the source of performance. Cherry-picked start dates can change the narrative substantially, especially after a market trough or peak.
Practical checklist
Validate and geometrically link periodic returns, preserve missing-data rules, and use a total-return benchmark. Show the exact date range and allow users to inspect subperiods without silently rebasing one series differently. Pair the chart with annualized return, drawdown, and cash-flow-aware investor return. Test that the ending cumulative figure fully reconciles with the displayed growth of invested portfolio capital.
Sources and further reading
- GIPS Standards Handbook for Firms, Global Investment Performance Standards