An annual charge of one percent sounds negligible against returns quoted in high single digits. Over an investing lifetime it is not, and the arithmetic is worth working through once.
The compounding asymmetry
Returns compound on the growing balance. So do charges.
Which means a charge is not one percent of the initial amount. It is one percent of a balance that grows, taken every year, and the amounts not taken would themselves have compounded.
Over several decades, the cumulative effect of a one percent annual charge on a portfolio growing at a typical long-run rate consumes a substantial fraction of the final value.
The exact figure depends on the return assumed and the period, and it is always larger than intuition suggests.
The layers
Costs frequently sit at multiple levels and each is disclosed separately.
A platform or custody charge for holding the assets.
A fund management charge for running each fund.
Transaction costs within the fund, arising from its own trading, which do not appear in the management charge.
Advice charges where an adviser is involved.
And in some structures, a further layer where funds hold other funds.
Regulations in most markets require disclosure of an aggregate figure, and finding it is more useful than comparing any single component.
Transaction costs
The least visible layer and not the smallest.
When a fund trades, it pays spreads, commissions and in some markets transaction taxes, and it moves prices against itself when trading in size.
These are borne by the fund and reduce returns without appearing in the headline charge.
Which means a high-turnover fund can cost considerably more than its stated charge, and a low-turnover fund considerably less than the difference in stated charges suggests.
Portfolio turnover is disclosed and is worth checking alongside the charge.
Performance fees
Where a manager takes a share of returns above a threshold.
The structure sounds aligned and the details determine whether it is.
A high water mark prevents the manager charging twice for recovering losses. Without one, a fund that falls and recovers generates fees on the recovery.
A hurdle rate means the fee applies only above a specified return, so the manager is not paid for market movement.
The absence of either is a meaningful weakness in the structure, and both are stated in the documentation.
The spread on the way in
Some products carry an initial charge or a bid-offer spread, which is a one-off cost at purchase.
These have declined substantially under competitive pressure and have not disappeared, particularly in less liquid asset classes where they reflect genuine transaction costs rather than margin.
Currency costs
Frequently overlooked and material for anyone holding foreign assets.
Converting currency to buy a foreign asset carries a spread, applied at purchase and again at sale.
Platform conversion rates vary enormously, from close to the interbank rate to several percent away from it.
For someone making regular foreign purchases, this can exceed the fund charge entirely, and it is rarely presented alongside the other costs.
Where the argument stops
Low cost is not the only consideration and treating it as such is its own error.
A cheap product that does not do what you need is not a bargain, and an expensive product delivering something genuinely unavailable elsewhere may be worth it.
The reasonable position is that cost is one of very few things about future returns that can be known in advance, which is why it deserves attention out of proportion to its apparent size.
Everything else about a fund is a forecast. The charge is a fact.
The practical exercise
Finding the aggregate cost figure for whatever you currently hold takes perhaps thirty minutes and most people have never done it.
Whatever the number turns out to be, knowing it is better than not.
This describes how costs are structured and does not recommend any product. Investment decisions should involve a regulated adviser where the amounts justify it.
The active management question
Where the cost argument becomes contentious.
Higher charges are justified on the basis of expected outperformance, which means the relevant comparison is net of all costs against a comparable passive alternative.
Studies over long horizons consistently find that a majority of active funds underperform their benchmark after costs, with the proportion rising as the period lengthens.
Which is close to arithmetically inevitable in aggregate, since active managers collectively hold the market and their costs are higher.
It does not establish that no manager adds value, only that identifying them in advance is the difficult part, and past performance has proven a weak guide.
Survivorship in the data
Worth knowing when reading performance comparisons.
Funds that perform poorly are frequently closed or merged, which removes them from the record.
Which means a sector average calculated from surviving funds overstates what an investor would actually have experienced, sometimes substantially.
Databases that account for this exist, and figures quoted in marketing generally do not use them.