Norbert's gambit — converting CAD to USD without the spread

Moving money between Canadian and US dollars is one of the few costs in a brokerage account that is both large and entirely avoidable. A bank branch, or the conversion built into a discount broker's trading screen, typically takes somewhere between 1.5% and 2.5% of the amount — not as a stated fee, but as a rate set a percentage point or two away from the one quoted on the news. On C$50,000 that is several hundred to well over a thousand dollars, extracted quietly, for a transaction that carries them no risk and almost no work.

Norbert's gambit is the standard way around it. Rather than asking anyone to convert your currency, you buy a security that trades in both currencies, move it to the other side of the account, and sell it there. The conversion happens at the market's own exchange rate, and the only money that leaves is two trading commissions.

Where the spread hides

Brokers do not itemize foreign exchange. There is no line on the confirmation reading "FX fee"; there is only a rate, and the rate already contains the markup. That is precisely why the cost survives — a fee you can see gets compared, and a rate you cannot benchmark does not.

The size of it is worth stating plainly. A 1.5% spread on C$50,000 is about C$750. On a portfolio of that size held in a low-cost index fund, C$750 is roughly seven years of management fees. It is also charged in both directions, so a round trip out and back costs it twice, and anyone converting a US-dollar paycheque or dividend stream every few months pays it again on each pass. If you are weighing a US-dollar offer against a Canadian one, this cost belongs in the comparison alongside the tax difference the cross-border salary calculator works out.

The mechanism

The gambit needs one thing: a security interlisted in both currencies, meaning the same asset has a Canadian-dollar ticker and a US-dollar ticker. Three steps follow.

1. Buy the Canadian-dollar listing with your Canadian dollars.
2. Journal the position to the US-dollar listing. A journal is not a trade — it is your broker recognising that the two tickers hold the same thing and re-labelling your position. Nothing is bought or sold, and no disposition occurs.
3. Sell the US-dollar listing. The proceeds land in the US-dollar side of your account.

The canonical vehicle is a US-dollar cash ETF that trades as DLR in Canadian dollars and DLR.U in US dollars. It holds nothing but US-dollar deposits, so its net asset value in US dollars barely moves; its Canadian price is essentially that stable US value multiplied by the exchange rate. This is the property that matters. For the day or two you hold it, the exchange rate is the only thing that can move your position — which is the exposure you had already accepted by deciding to convert.

A dual-listed operating company works mechanically, and people did it that way before purpose-built vehicles existed. It is a worse idea now: holding a bank or a railway across the journal adds two days of equity risk to a transaction whose entire point was to stop paying for things you did not want.

A worked example

Take C$50,000, an exchange rate of 1.3500 Canadian per US dollar, and a broker charging C$9.99 a trade. At that rate the fund's mid prices are C$13.50 and US$10.00. Assume you cross the spread on both sides: you buy at an ask of C$13.51 and sell at a bid of US$9.995.

That is an effective rate of 1.3523, against a mid-market 1.3500. The whole conversion cost C$85 — about C$62 of bid–ask spread on the two trades and C$23 of commissions, and nothing else. Set it beside the alternatives on the same amount:

The frictions

Nothing above is free, and the reasons people abandon the gambit halfway are consistent.

Settlement and the journal queue. Trades settle a business day after execution, and most brokers will not journal a position that has not settled. Some platforms journal automatically the moment you place a sell order on the other listing; others require a secure message or a phone call and take a business day to action it. Budget two to four business days end to end, and do not start one the week you need the money.

The bid–ask spread on the fund itself. A cent on a C$13.50 unit is a little under a tenth of a percent, and you may pay it twice. Limit orders at or inside the quoted spread recover most of it; market orders on a thin quote can cost more than the commissions did.

Odd lots and leftover cash. Buy whole units, and a small Canadian-dollar remainder stays behind. That is fine — chasing the last C$40 with a second trade adds a commission to save nothing.

The auto-conversion trap. This is the one that turns a saving into a loss. If the account cannot hold US dollars, the broker converts the proceeds back to Canadian dollars at the house rate the moment they settle. You have then paid the spread you were avoiding, plus two commissions, plus the bid–ask. Confirm the account holds both currencies before the first trade, not after the third.

Reporting. In a non-registered account the round trip is a disposition. It is normally a gain or loss of a few dollars, reported in Canadian dollars, and it still has to appear on the return.

When it is worth doing

The commissions are fixed and the spread savings scale with size, so the answer is a threshold rather than a rule. Below roughly C$1,700 the two commissions eat the whole advantage. Above it, the gap widens in a straight line.

What the gambit saves, by amount converted

	What the gambit saves, by amount converted
$2,000	≈ $4
$5,000	≈ $45
$10,000	≈ $114
$25,000	≈ $321
$50,000	≈ $665
$100,000	≈ $1,353

Broker FX at a 1.5% spread against the gambit at about 0.12% of bid–ask plus C$23 of commissions. Figures rounded.

In practice the honest floor is higher than the break-even. Under about C$5,000 you are working two or three days for a coffee-shop sum and accepting a small chance of fumbling a step; above C$10,000 it is clearly worth the afternoon, and above C$50,000 it is difficult to justify not doing it. The same arithmetic — a small percentage applied to a large number, invisible because it is expressed as a rate — is what makes the cost of borrowing to invest worth checking with the same suspicion.

Registered accounts and what the US dollars are for

Most people converting large sums are doing it to buy US-listed securities, and the account those securities sit in changes the calculation around them. US dividends paid into an RRSP escape the withholding tax that a tax treaty does not relieve elsewhere, which is one reason the RRSP is the natural home for US dividend payers; the same dividends paid into a TFSA lose a slice that can never be reclaimed. Neither point changes how the gambit works, but both change where the converted money should end up.

Registered accounts add one practical constraint. The gambit only works where the plan can hold US dollars as a currency, and support varies by broker and by account type. Where it is unsupported, converting outside the plan and contributing US dollars in is sometimes possible and sometimes not — worth confirming before you start, because discovering it at the sell step means paying the spread anyway.