Costs
The exchange rate is where the quiet charge lives
Buying a foreign-listed holding usually means converting money twice. The rate you actually get is not the rate you saw quoted anywhere.
This is written to be used rather than admired. Each section below is a decision about currency conversion charges, and each one has a default.
Before you start
- Conversion cost is often a margin on the rate rather than a stated fee.
- A home-currency listing of the same exposure avoids the conversion entirely.
- Conversion cost and currency risk are different problems with different fixes.
Two costs in one transaction
When you buy an asset priced in another currency, the platform converts your money and charges you for performing that conversion. That charge frequently takes the form of a margin added to the exchange rate rather than a separate line on the contract note.
A stated percentage fee plus an undisclosed margin on the rate means the true cost is higher than the headline number implies. The same happens in reverse when you sell, so a round trip in a foreign currency pays the conversion cost twice over. Because it is embedded in the rate, most people never see it and consequently never compare it between providers.
How much it varies
Conversion margins differ enormously between platforms, and some tier the rate so that larger transactions convert more cheaply. The published reference rate is usually an interbank figure, which is a rate no retail customer has ever actually received.
Some providers offer a currency account that lets you hold the foreign currency and convert once rather than on every single trade. That arrangement suits somebody trading foreign holdings repeatedly and matters very little to a monthly buyer of a home-listed fund. The disclosure sits in the charges schedule rather than on the trading screen, which is where the decision actually gets made.
Avoiding it entirely
A fund listed and priced in your own currency removes the conversion at the point of trade, even when it holds foreign assets. The fund still converts currency internally, but it does so at institutional rates and inside the ongoing charge you were paying anyway. That is usually far cheaper than a retail conversion performed separately on every purchase you make.
Where it helps most, the choice of listing is therefore a cost decision as well as a convenience one, and both point the same way for regular contributors. Where the same fund is available on several exchanges in several currencies, the home-currency line is frequently the cheaper route in.
Dividends arrive in a currency too
Income paid by foreign holdings arrives in the currency of the holding and is converted before it reaches your account. That conversion is charged in exactly the same way, quietly and at a rate you did not choose or see in advance. For a portfolio generating regular income, this turns into a recurring cost rather than a one-off charge at purchase.
The useful part is this: accumulation share classes sidestep it by keeping the reinvestment inside the fund at institutional rates.
Where a platform offers a currency account, leaving income in that currency to reinvest can avoid one leg of the conversion.
What this is not
Paying a conversion cost is not the same thing as taking currency risk, and the two get confused with striking regularity. The conversion cost is a one-off charge at the moment of transaction, usually measured in a fraction of a per cent. Currency risk is the continuing exposure of your assets to exchange rate movement, and in most years it is far larger.
On an ordinary week, a hedged share class addresses the second and does nothing about the first, while a home-listed fund addresses the first. Knowing which of the two you are actually worried about determines which of two very different responses is relevant.
Some of this will suit you and some will not, and that is the point.
A short checking routine
Look up the conversion margin in your platform's charges schedule and write it down next to the dealing fee. Estimate how many conversions your normal pattern of investing generates in a year, which for many people turns out to be none.
On an ordinary week, if the answer is more than a handful, check whether a home-currency listing of the same exposure exists on the same platform. If you genuinely need foreign currency holdings, ask whether the platform lets you hold that currency rather than converting each time. This is one-off housekeeping rather than something to monitor, and it stays fixed once you have addressed it.
The takeaway
Find the conversion margin once. For most people the answer is to buy a home-currency listing and forget about it.
Pick the one that costs you least, and let the rest wait.
Questions readers ask
Is the conversion charge included in the dealing fee?
Usually not. It is commonly a separate margin applied to the exchange rate, disclosed in the charges schedule rather than shown on the trade confirmation.
Does buying a home-currency listing remove currency risk?
No. It removes the conversion cost at the point of trade. The assets inside still carry whatever currency exposure they carry.
