The risks and the costs of public equity are different in kind. One is mostly survivable; the other is certain, compounding, and largely within your control.
13 min read · Level 2
Turnover is the cost investors control most completely and examine least, and the imbalance is not accidental - the fee is levied by somebody else and therefore feels like something being done to you, while turnover is self-inflicted and therefore reads as activity rather than as expense. The arithmetic does not respect the distinction. In the illustration above, annual realisation at a 20% rate cost roughly two-thirds of what the gap between an expensive wrapper and a cheap one cost over the same 25 years, and it arrived without a single line item anywhere. That was also the most generous comparison the fee could have been given: 82 basis points is about as wide as that choice ever gets, while the charge on turnover does not shrink when the fee spread narrows - so move the spread toward what most holders are really deciding between and the ordering reverses. The awkward implication is that a wrapper is chosen once and a rate of activity is chosen again every year, so the largest improvement still available once a cheap wrapper has been taken is not a better selection but less activity, and that is the hardest one to adopt because it looks and feels like doing nothing. Anyone who has moved a platform to save ten basis points and then traded their portfolio over twice in the same year has optimised the visible cost and multiplied the invisible one, and they will have felt diligent throughout.
Four things take money out of an equity holding, and they are genuinely different in character.
Drawdown is the fall from a previous high. It is uncomfortable, it is frequent, and on its own it costs nothing unless you transact. The distinction between a decline you sit through and a loss you cannot recover is the subject of the Risk, Return and Compounding lesson on volatility versus permanent loss, and is not re-argued here; what matters for this class is that a continuously quoted price makes every decline visible, which turns a survivable event into a decision.
Permanent loss is the residual claim being extinguished or badly impaired - the business failing, or being diluted, or being worth structurally less than you paid with no path back. That is the real risk, and it is not the same as the price being down.
Costs are certain. Explicit ones - commission, an expense ratio on any fund wrapper, custody and platform charges - and implicit ones, principally the bid-ask spread and the slippage from working an order through the book. The implicit ones never appear on a statement and are paid on every round trip.
Tax is the fourth, and in most jurisdictions it is triggered by the act of selling rather than by the passage of time. That single design feature is what makes turnover expensive in a way that is invisible to anyone comparing headline returns.
Because the risk gets nearly all the attention and the costs do nearly all the predictable damage.
Drawdowns are dramatic, so they dominate the conversation, and they recover often enough that a holder who does nothing is usually fine. Costs are undramatic, so nobody discusses them, and they recur every single year without ever recovering. Over a long hold the arithmetic is not close.
And because the tax treatment of a realised gain is the one cost that is almost entirely a consequence of your own behaviour. You cannot choose whether the market falls. You can choose how often you sell, and in most systems that choice changes your outcome by more than the difference between a good and a mediocre selection.
This is educational information, not tax or accounting advice. Rules differ by country and change — get advice from a qualified professional in your jurisdiction before acting.
Educational, not personalised financial advice. Nothing in the Investor Academy is a recommendation to buy, sell or hold anything — what is right for you depends on your own circumstances and the rules where you live.
Sources: U.S. SEC - Investor.gov; U.S. IRS - official tax information; UK Government - Capital Gains Tax guidance; FINRA - investor information
Three costs, on the same starting sum, over the same period, so they can be compared honestly. Start with 50,000, assume a gross return of 7% a year for 25 years, and treat every rate as illustrative.
First, the ongoing charge. Compare a wrapper costing 0.90% a year with one costing 0.08%.
Net return at 0.90%: 7.00% - 0.90% = 6.10% Net return at 0.08%: 7.00% - 0.08% = 6.92% 50,000 x 1.0610^25 = 219,712.42 50,000 x 1.0692^25 = 266,344.51 Difference: 46,632.09
The cheaper wrapper ends 21.2% ahead. The annual gap was 0.82 percentage points and nobody felt it in any single year.
Second, the spread. On a share quoted 47.80 / 47.95, the half-spread is 0.075, which is 0.16% of the price on each side and 0.31% for a round trip. That is paid every time you change your mind, and it is charged whether the trade turns out well or badly.
Third, tax on turnover. Suppose - purely as an illustration, because rates and rules differ by country and change over time - that a 20% rate applies to realised gains. Compare two holders of the same asset over the same 25 years at the same 7%.
Holder A never sells until the end: Gross value: 50,000 x 1.07^25 = 271,371.63 Gain: 221,371.63 Tax at 20%: 44,274.33 After tax: 227,097.31
Holder B realises and re-buys every year, paying tax annually: Net annual return: 7% x (1 - 0.20) = 5.60% 50,000 x 1.0560^25 = 195,239.62
Difference: 31,857.68, or 16.3% more for the holder who did nothing
Both holders made identical selections and identical gross returns. The 31,857.68 is the price of turnover alone, and it exists because tax deferred is tax that keeps compounding for you in the meantime. Expressed as an annual rate, Holder A compounded at 6.24% after tax and Holder B at exactly 5.60%.
A note on the jurisdiction, because it decides everything above. This illustration uses a flat 20% rate on realised gains, which is a simplification of no country's actual system. In the United States, for example, gains on assets held beyond a threshold period are taxed at different rates from short-term gains, dividends may be taxed at either rate depending on how they qualify, and account type changes the treatment entirely. In the United Kingdom, capital gains and dividends are taxed under separate regimes with their own allowances and rates, and certain wrappers remove the charge altogether. Other countries differ again, and several tax realised gains not at all. Rates, thresholds and definitions also change with each budget. Use the illustration for the mechanism - deferral compounds - and get the numbers for where you actually live from your own tax authority or a qualified adviser.
Finally, the risk figure worth keeping beside all of this. Recovering from a fall requires a larger gain than the fall:
A 20% decline needs a 25.0% gain to get back A 30% decline needs a 42.9% gain A 50% decline needs a 100.0% gain
That asymmetry is arithmetic, and it is the reason avoiding the permanent kind of loss matters so much more than avoiding the temporary kind.
Start with the one nearly everyone makes: negotiating hard on the visible fee and ignoring the invisible ones. People will move a platform to save 0.10% a year and then pay 0.31% in spread six times in the same year without noticing.
The second is reading a drawdown as a loss. It becomes one when you sell, and the continuous quote is very good at making it feel like it already happened.
The third is rebalancing or repositioning without asking what the tax event costs. In a taxable account a sale is a charge brought forward, and in the illustration above the holder who never brought it forward finished 16.3% more than the one who did it every year.
The fourth is assuming the treatment that applies to a friend or an article applies to you. Account type, residence, holding period and the nature of the income all change the answer, and they change it by more than most of the decisions people agonise over.
The fifth is confusing low volatility with low risk. A share that moves very little can still be a residual claim on a business that is slowly being competed out of existence, and that is the kind of loss you do not recover from.
Platform or custody fee, any fund expense ratio, commission per trade, and an estimate of spread cost: your annual traded value multiplied by the round-trip spread. Express the whole thing as a percentage of your portfolio. Most people have never seen this number and it is usually larger than the one they were arguing about.
Ask whether the residual claim has been impaired - obligations grown, earnings power structurally reduced, dilution - or whether the price has moved without the business changing. Write which one you think it is and why. The answer determines whether selling is prudent or expensive, and the quote itself cannot tell you.
Take the total value of everything you bought and sold in the last twelve months and divide by the average value of the portfolio. That percentage is the input that drives both spread cost and, in a taxable account, the timing of every charge. It is also entirely yours to change.
Go to your own tax authority for the current rates, thresholds, holding-period rules and account types, and check how dividends are treated relative to gains. If any of it is not obvious, that is a question for a qualified adviser in your jurisdiction rather than a thing to infer from an article written elsewhere.
Before any discretionary sale in a taxable account, compute the charge it triggers and compare it with what you expect to gain from the switch. A 20% charge on an accumulated gain is a high bar for a marginal improvement to clear, and most repositioning is marginal.
Write down now what you will do if a holding falls 30%: add, hold, or sell, and on what evidence. A decision made in advance is a decision made by you; one made during the fall is made by the quote, and the quote is updating every few seconds.
When you are comparing wrappers or platforms, when you are considering a change of position in a taxable account, and once a year as an audit of what your own activity is costing.
Do not use any tax figure in this lesson as the rate that applies to you - it is illustrative and no country works this way. And do not let tax considerations stop you selling something that genuinely should be sold; the charge is a cost of a good decision, not a reason to avoid making one.
When investors are asked what their equity holdings cost them annually, the answers reliably cluster around the explicit charges - the platform fee and the fund expense ratio - because those appear on statements with names attached. Spread, slippage and the tax brought forward by discretionary sales are typically absent from the answer entirely, not because they are considered and dismissed but because nothing in the reporting surfaces them. A cost that is embedded in the price you transacted at has no line, no label and no annual summary, and for most holders it is therefore invisible regardless of its size.
Estimate the unstated costs once a year by hand: traded value times round-trip spread, plus tax realised. Anything with no line item will not be noticed by any other route.
A consistent observation about behaviour during sharp market declines is that selling activity by individual holders peaks near the bottom of the move rather than at the start of it, and that the decision is typically described afterwards as having been about risk rather than about discomfort. The mechanism is the continuous quote: a decline that would be invisible in an unquoted asset is, in this class, a number updating in front of you, and the longer it persists the more it reads as accumulating evidence rather than as one fact repeated. A response written down in advance is the only version of that decision made with a clear head.
Write your response to a 30% decline before one occurs, with the evidence that would change it. Decisions made while watching a quote are made by the quote.
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