🎯 In 30 seconds: Investors often earn less than the funds they own, because they buy after prices rise and sell after they fall. Morningstar measured this gap at about 1.1 percentage points a year over the ten years ended 2023, roughly 15% of what the funds actually returned. The fix is less activity, not more skill.
What the gap is
A fund’s published return assumes you bought at the start and held to the end. Real investors add and pull money at different times. Morningstar calculates a dollar-weighted “investor return” that captures that timing, and compares it with the fund’s total return.
| Study | Morningstar, Mind the Gap 2024 |
| Period | 10 years ended December 31, 2023 |
| Investor return (average dollar) | 6.3% a year |
| Funds’ total return | About 7.3% a year |
| Gap | About 1.1 percentage points a year, roughly 15% of total return |
Morningstar also found the gap was widest in sector equity funds, about 2.6 percentage points a year, and that the gap appeared in all ten calendar years of the study. Narrow, volatile funds tempt people to trade at the wrong times. Morningstar publishes a new edition each year, so check the latest for current figures.
Five habits that cause it
| Habit | What it looks like | A rule that helps |
|---|---|---|
| Panic selling | Selling after a 25% drop “until things settle down” | Decide your mix in advance; rebalance on a date, not a headline |
| Chasing performance | Buying last year’s top fund or hot sector | Look at 10-year records and costs, not 1-year returns |
| Overconfidence | Frequent trading; a few big bets | Cap any single stock at a small slice; track your real results |
| Home bias | Owning only US stocks, or your employer’s stock | Know what share of your stocks is outside the US, and why |
| Market timing | Waiting in cash for a dip that may come at a higher price | Automate contributions every payday |
Worked example
Take $100,000 for 30 years. If the funds earn 7% a year, the end balance is about $761,000. If poor timing shaves off 1.1 percentage points (5.9% a year), it is about $558,000. That is roughly $203,000 lost without paying a single extra fee, purely from when money moved in and out. Illustrative numbers, not a forecast.
What narrows the gap
- Automation. Payroll contributions to a 401(k) buy on schedule in good markets and bad.
- All-in-one funds. Morningstar has repeatedly found smaller gaps for allocation and target-date style funds, which rebalance for you.
- Fewer looks. Checking balances daily makes normal swings feel like emergencies.
- A written plan. One page: your mix, when you rebalance, and what you will do in a 30% drop.
- A cooling-off rule. Wait 72 hours before any trade that isn’t on the plan.
For a feel of what a crash does to a portfolio before you live through one, see the investing guide and the crashes page in this section.