Investing term
What is Behaviour gap?
The gap between the returns a fund delivers and the returns its actual investors earn.
The behaviour gap is the shortfall between the returns a fund delivers and the returns its actual investors pocket, caused by buying high and selling low at the worst moments. The fund's published number assumes you bought once and held; real investors pile in after a run-up and bail out after a fall, so their real-money timing lags the fund itself.
It's a reminder that an investor's own decisions — not the fund — are often the biggest drag on results. Studies of investor cash flows repeatedly find that people earn less than the very funds they hold, by one to several percentage points a year, purely because of poorly timed buying and selling. The gap is the measurable cost of letting emotion drive timing, and closing it requires no skill — just holding steady and automating contributions rather than reacting to markets.
Investors tend to buy after a rise and sell after a fall — poor timing that makes their real returns trail the very funds they hold. The gap is the cost of letting emotion drive timing.
For example
A fund returns 8% a year, but investors who bought after it soared and sold after it slumped earn just 5% — the 3-point behaviour gap is the cost of their timing.
Learn it by doing
That's Behaviour gap in theory — it clicks when you use it. Practise it hands-on in a free, interactive lesson (Stage 11, Automate, Compound & Start Early).
Try the free lesson →Why it matters to you
The behaviour gap matters because it shows that what you own matters less than how you behave with it. A great fund delivers nothing if you keep jumping in and out at the wrong times, while a mediocre one held steadily can beat it. Closing the gap costs nothing and needs no expertise — automating contributions and not touching the plan when markets get emotional captures returns most investors give away through poor timing.
⚠ Blaming the fund for your own timing
When returns disappoint, it's tempting to fire the fund and chase a better one — but the shortfall is often the behaviour gap, not the fund. Switching just locks in the loss and restarts the same buy-high, sell-low cycle with a new holding. The fix is usually to stop trading the plan, not to change what you hold.