To buy US stocks through Interactive Brokers (IBKR) from Canada, you need to convert your Canadian dollars (CAD) to US dollars (USD) — and how you handle that conversion directly affects your profit.
IBKR offers two main currency conversion methods: a manual FX trade through their platform (with a small commission and no markup on quotes), and an auto-conversion service that adds roughly 0.03% to the exchange rate.
Both methods beat what most Canadian bank brokerages charge, but a third option — converting CAD to USD through an external provider before funding your IBKR account — can shave costs even further.
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How does currency conversion work on Interactive Brokers?
IBKR handles CAD-to-USD conversion differently depending on your account type and how you initiate the trade.
Cash accounts
If you hold a cash account, IBKR requires settled USD before you can purchase US-listed stocks. You must manually convert your CAD to USD through their currency conversion tool, then wait for the FX trade to settle (typically T+2) before placing your stock order.
The process is straightforward: open the currency conversion tool in Client Portal or Trader Workstation, select the currency pair (CAD.USD), enter the amount you want to convert, submit the order at the live interbank rate, then wait two business days for settlement.
IBKR charges a commission of 0.002% of the trade value (with a $2 minimum) on manual conversions — no markup on the rate itself. On a $5,000 conversion, that's $2. Compare that to the $75–$125 a bank brokerage would embed in their exchange rate on the same amount.
Margin accounts
With a margin account, IBKR lets you buy US stocks even if your cash is sitting in CAD. However — and this part catches people off guard — the platform doesn't automatically convert your money. Instead, you end up holding a negative USD balance, which is treated as a loan. You pay interest on that borrowed USD balance until you either convert your CAD manually or deposit USD.
IBKR's margin rates vary by currency and balance size, but as of early 2026, USD margin rates hover around 5.8%–6.3% for balances under $100,000. If you buy $5,000 in Walmart stock and leave the negative USD balance untouched for a month, you're looking at roughly $25 in interest charges alone. Converting your CAD before trading avoids the loan entirely.
Auto-conversion
IBKR also offers an auto-conversion service for certain account types and situations. According to IBKR's commission schedule, the auto-conversion typically adjusts the exchange rate by about 0.03% and does not charge a separate commission on those trades. The convenience is real, but you give up control over timing and rate selection.
What is the cheapest way to convert CAD to USD for stock trading?
The lowest-cost conversion path depends on your frequency, amount, and patience. Three main approaches exist for Canadian investors funding an IBKR account with USD, and each carries different tradeoffs between cost, speed, and effort.
| Method | Approximate cost on $10,000 | Settlement time | Effort level |
|---|---|---|---|
| IBKR manual FX conversion | ~$2 (commission only) | 2 business days | Low |
| Norbert's Gambit | ~$5–15 (spread + commissions) | 2–5 business days | Medium |
| External fintech provider + USD deposit | $30–50 (0.3%–0.5% margin) | 2–3 business days + deposit time | Medium |
| Canadian bank branch exchange | $150–250 (1.5%–2.5% markup) | Same day (at branch) | Low |
Manual FX through IBKR
Converting directly through IBKR's FX trading interface gives you interbank rates with a tiny commission. For most retail investors converting under $25,000, the total cost sits well below 0.01% of the converted amount. The only real downside is the two-day settlement wait before you can trade with those funds.
Norbert's Gambit
Norbert's Gambit involves buying a dual-listed ETF (like DLR) in CAD, journaling the shares to the USD side, and selling in USD. The effective conversion cost is minimal (just the bid-ask spread and two small commissions), but the process takes 2–5 business days to complete depending on the brokerage. IBKR's own manual FX conversion is faster and cheaper, so Norbert's Gambit is more relevant at brokerages with high FX markups.
External provider + USD deposit
A third approach involves converting your CAD to USD through an external currency exchange service and then depositing the USD directly into your IBKR account. Canadian fintech providers such as RemitBee charge significantly less than banks — with exchange rate margins of 0.3% to 0.5% and no separate fees — compared to the 2%+ markups most bank branches and credit cards apply.
How do you fund an Interactive Brokers account with USD?
If you've already converted your CAD to USD (through any method), depositing those US dollars into your IBKR account requires linking a bank account and completing a verification process. IBKR supports several deposit methods for Canadian residents, including EFT (electronic funds transfer), wire transfer, and bill payment.
Link your bank account
Log into IBKR's Client Portal and head to the Transfer & Pay section. From there: select "Deposit" and choose USD as the currency, pick your preferred deposit method (EFT is free for most Canadian banks), enter your banking details for the USD account you're depositing from, and submit the linking request.
For EFT deposits specifically, IBKR verifies your bank connection by sending micro-deposits (small credits and debits of a few cents) to your linked account. You'll need to confirm the exact amounts through IBKR's portal before the link becomes active. The whole verification process takes 1–3 business days.
Submit the deposit
Once verification completes, you can request an actual fund transfer. Select the linked USD account, enter your deposit amount, and submit. EFT deposits from a Canadian bank to IBKR typically take 1–4 business days to arrive, depending on your institution. Wire transfers arrive faster (usually same-day or next-day) but most banks charge $15–$45 per outgoing wire.
Registered vs. non-registered
If you hold a TFSA or RRSP with IBKR, you can still fund the account with USD. The deposit process is the same, but registered accounts have stricter rules around currency holding and conversion. IBKR's cash-account structure within registered plans means you need settled currency before trading — no margin borrowing allowed.
Why do Canadians buy US stocks through Interactive Brokers?
The NYSE and Nasdaq rank as the two largest stock exchanges globally by market capitalization. Canadian investors who want exposure to companies like Tesla, Microsoft, or Walmart need access to these exchanges — and IBKR has built a strong reputation for providing that access at lower costs than most Canadian alternatives.
Portfolio diversification
Holding only Canadian equities concentrates your risk in a relatively small market. US stocks let you spread capital across sectors that barely exist on the TSX (think semiconductors, big tech, and large-scale biotech). A USD account also gives you natural currency diversification, which matters if you believe the Canadian dollar will weaken over time.
IBKR's pricing edge
Most Canadian bank brokerages charge $6.95 to $9.95 per stock trade plus a built-in FX markup of 1.5% to 2.5% on every currency conversion. IBKR, by contrast, charges as low as USD $0.0035 per share (with a $0.35 minimum) on its tiered pricing and does not mark up FX quotes at all.
The savings become obvious at scale. On a $10,000 CAD to USD conversion, a 2% bank markup costs you $200. IBKR's manual FX trade on the same amount costs roughly $2.
| Feature | IBKR | Typical Canadian bank brokerage |
|---|---|---|
| Stock commission (US-listed) | USD $0.0035/share (min $0.35) | $6.95–$9.95 flat |
| FX markup on quotes | None (passes through interbank rate) | 1.5%–2.5% embedded in rate |
| FX commission (manual conversion) | 0.002% of trade value (min $2) | Included in markup |
| Auto-conversion charge | ~0.03% rate adjustment | N/A (forced conversion at markup) |
What should Canadian investors watch out for when converting currency?
Currency conversion for stock trading introduces a few pitfalls that new investors miss. Being aware of them saves both money and frustration.
Hidden FX spreads
A "$0 fee" conversion is not necessarily free. Every currency exchange provider builds some cost into the transaction, either as an explicit commission or as a spread (the gap between the mid-market rate and the rate you receive). The mid-market rate — the midpoint between the buy and sell price on the open forex market — is your reference point. Any deviation from that rate is your real cost, whether the provider calls it a fee or not.
Conversion timing
Forex markets close on weekends and have variable liquidity throughout the day. Converting during North American market hours (9:30 AM to 4:00 PM ET) typically gives you the tightest spreads because trading volume peaks during that window. Submitting a conversion Friday evening may result in a less favorable fill when markets reopen Monday.
Tax implications
Every CAD-to-USD conversion creates a taxable event in a non-registered account because the CRA treats it as a foreign currency disposition. If the Canadian dollar weakens between when you bought USD and when you sell it, you may owe capital gains tax on the currency gain — separate from any stock gains. Keeping records of every conversion — the date, amount, and exchange rate — matters come tax season.
Save on CAD to USD conversion with RemitBee
Canadian investors who regularly convert currency for stock trading, cross-border purchases, or family transfers can trim costs by converting through RemitBee before depositing into their brokerage account. RemitBee is FINTRAC-regulated with bank-level encryption, transfers complete in 2–3 business days via EFT, rate alerts notify you when the CAD/USD rate moves in your favor, and exchange rate margins are just 0.3%–0.5% with no separate commission.
Sign up with RemitBee to start converting at rates that consistently beat Canadian bank branches.
Frequently asked questions
Does Interactive Brokers charge a fee to convert CAD to USD?
IBKR charges a small commission of 0.002% of the trade value (minimum $2) on manual currency conversions, but does not mark up the interbank exchange rate. For auto-conversions triggered by stock trades, IBKR adjusts the rate by approximately 0.03% instead of charging a separate commission. Both options cost far less than the 1.5%–2.5% FX markups most Canadian bank brokerages) embed in their rates.
Can I hold USD in my Interactive Brokers account?
Yes. IBKR supports multi-currency accounts, so you can hold CAD and USD balances simultaneously. Holding USD in your account means you avoid conversion costs entirely when buying and selling US-listed stocks, which is especially valuable for frequent traders.
Is it better to convert currency inside or outside of IBKR?
For most Canadian investors, converting directly inside IBKR is the cheapest option because you receive interbank rates with a minimal commission. Converting outside IBKR through a fintech provider makes sense if you want to park USD in a savings account first, or if you prefer to separate your banking and investing workflows. Converting at a bank branch is the most expensive option in almost every scenario.
Do I need a US bank account to fund IBKR with USD?
No. IBKR accepts CAD and USD deposits from Canadian bank accounts. You can deposit CAD and convert it inside the platform, or deposit USD directly if your Canadian bank offers a USD chequing or savings account. A dedicated US bank account is not required.
