Interactive Brokers Currency
Conversion Guide (2026)
IBKR charges just 0.03% for auto-conversion and as low as $2 per manual FX trade — making it the cheapest currency conversion of any European broker. This guide covers the exact EUR→USD workflow, what “base currency” actually means, what it costs, and the mistakes that quietly create FX drag.
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TL;DR
- Manual FX: ~$2 minimum per conversion (0.08–0.20 bps × value).
- Auto FX: 0.03% markup, no commission — use for small amounts.
- Best workflow: fund in EUR → convert in chunks → buy from USD cash.
- Base currency is a reporting setting, not your actual cash.
- Multi-currency: hold EUR + USD simultaneously — convert when you choose.
- Buying USD assets without converting first — IBKR will lend you USD and charge margin interest.
- Converting €200 at a time — $2 on €200 = 1% effective fee. Batch instead.
- Changing base currency and expecting cash to convert automatically.
- Using “Forex trading” in TWS instead of “Convert Currency.”
How much does IBKR currency conversion cost?
IBKR offers two conversion methods. Both are far cheaper than any European neobroker.
- Commission: 0.08–0.20 bps × trade value (tiered).
- Minimum: $2 per conversion.
- Spread: interbank rate, no markup — as tight as 1/10 of a pip on EUR/USD.
- Use for: planned monthly or quarterly conversions of €1,000+.
- Markup: 0.03% on the exchange rate.
- Commission: none — the markup replaces it.
- Triggers: when you buy an asset in a currency you don’t hold.
- Use for: convenience on small amounts below the €400–500 threshold.
| Broker | FX method | Cost on €5,000 |
|---|---|---|
| IBKR (manual) | $2 min + interbank spread | ~€2 (0.04%) |
| IBKR (auto) | 0.03% markup, no commission | ~€1.50 (0.03%) |
| Trading 212 | 0.15% on interbank rate | ~€7.50 (0.15%) |
| DEGIRO | 0.25% auto-conversion | ~€12.50 (0.25%) |
Over 10 years of monthly €500 conversions, the difference between 0.03% and 0.25% compounds into real money. See the FX drag study for the full model.
How IBKR currency conversion actually works
Three concepts prevent 90% of beginner confusion. Understand these before you convert anything.
You can hold EUR, USD, GBP, CHF and more simultaneously in the same account. FX conversion is a real transaction that changes your balances: EUR goes down, USD goes up. You choose when to convert — IBKR doesn’t force you into automatic conversion on every buy.
Base currency controls how your statements, P&L, and portfolio are displayed. It does not automatically convert your cash. Switching from EUR to USD base currency changes your statements — your EUR cash stays as EUR. You still need to convert manually to hold USD cash.
If you buy a USD asset without holding USD cash, IBKR doesn’t block the trade. Instead it creates a negative USD balance and charges you margin interest — currently around 5.5–6.5% annualised depending on currency and tier. Many beginners don’t notice for weeks.
Fix: always check your cash balances before buying. Convert EUR→USD first, then buy from your USD balance.
The best EUR→USD workflow for European investors
Fund in EUR. Convert in chunks. Buy from USD cash. That’s it.
- Fund in EUR via SEPA (free, arrives same or next business day).
- Pick a cadence: convert monthly or quarterly — not on every deposit. The $2 fee hurts more on small amounts.
- Convert EUR→USD in Client Portal or TWS. Verify your USD cash balance has increased.
- Buy USD assets from your USD balance. No further FX cost.
- Alternative: buy EUR-listed UCITS ETFs (e.g. VWCE on AMS) directly in EUR — no FX needed at all.
| Cadence | $2 fee impact |
|---|---|
| €300/month (each deposit) | $2 = 0.67% — avoid |
| €1,000 monthly batch | $2 = 0.20% — ok |
| €3,000 quarterly batch | $2 = 0.07% — very cheap |
Below ~€400–500 per conversion, use auto-conversion (0.03%) instead of manual.
How to convert currency in IBKR
Two routes: Client Portal (simpler) or TWS (more control). Most investors only need Client Portal.
- Log in to Client Portal (portal.interactivebrokers.com).
- Go to Transfer & Pay → Convert Currency. (May also appear under Trading → FX depending on your portal version.)
- Select From: EUR and To: USD.
- Enter the amount. Convert accumulated savings in one chunk — not every deposit separately.
- Review the preview: check rate, estimated commission ($2 min), and total cost.
- Submit. Then go to Account → Balances and confirm USD cash increased and EUR cash decreased.
If you don’t see “Convert Currency,” search for “FX” in the portal search bar. IBKR occasionally reorganises menu items.
- Open TWS and search for the FX pair (EUR.USD).
- Critical: select “Convert Currency” — not “Forex” trading. Currency conversion changes your cash balance; Forex creates a leveraged position.
- Create an order to sell EUR / buy USD. Use a limit order during 14:00–17:00 CET for tightest spreads.
- After execution, verify EUR cash decreased and USD cash increased in the Account window.
When to convert: timing and spread behaviour
- Convert during 14:00–17:00 CET (European/US overlap) — tightest EUR/USD spreads.
- Use a limit order if you want a specific rate — it may or may not fill, but gives you control.
- Focus on cadence over timing — your conversion schedule matters far more than the exact minute you click.
- Converting during off-hours (midnight, early morning) when spreads are wider.
- Converting during major economic releases (NFP, CPI) — spreads spike sharply.
- Obsessing over 1-pip timing differences — the $2 fee and your cadence dwarf this.
Common IBKR currency conversion mistakes (and the fix)
IBKR doesn’t block the trade — it lends you USD at 5.5–6.5% annualised margin interest. Some beginners don’t notice for months.
Fix: always check your cash balances before buying. Convert EUR→USD first, then buy from your USD balance.
Base currency is reporting-only. Switching from EUR to USD base currency changes your statements — not your cash.
Fix: use Transfer & Pay → Convert Currency (or FX order) to actually move cash between currencies.
Converting €200 costs $2 minimum = 1% effective fee. That’s worse than DEGIRO.
Fix: batch deposits and convert in chunks of €1,000+ (manual), or use auto-conversion (0.03%) for small amounts.
Forex trading creates a leveraged FX position. Currency conversion changes your cash balance. They look similar in the UI.
Fix: always select “Convert Currency” and verify the order type before submitting. Check cash balances afterwards.
VWCE, CSPX, IWDA all have EUR-denominated listings on Euronext Amsterdam or XETRA. Buying the USD listing instead triggers FX conversion for no reason.
Fix: check whether your target ETF has a EUR listing before placing the order. See the UCITS vs US ETFs guide for context.
How dividends work with multi-currency accounts
No dividends are paid out — they’re reinvested inside the fund. No FX event at the broker level. This is the cleanest option for most European investors: zero currency friction from distributions.
Dividends arrive in the fund’s native currency — USD dividends stay as USD cash. IBKR does not auto-convert them to EUR.
Don’t convert each small payment individually — the $2 minimum makes that expensive. Let dividends accumulate and batch-convert, or use them directly toward your next USD purchase.
Why IBKR’s FX cost beats “commission-free” brokers
Brokers like DEGIRO (0.25% FX) and Trading 212 (0.15% FX) advertise zero commissions — but if you regularly buy assets in a different currency, FX conversion is your largest recurring cost, not commissions.
IBKR’s 0.03% auto-conversion (or ~$2 per manual trade) is 5–8× cheaper than the alternatives. Over a 20-year investing career with monthly conversions, the difference compounds into thousands of euros of drag.
The cleanest setup is the one that keeps you consistent and minimises unnecessary conversions. IBKR makes FX explicit and controllable — which is an advantage once you understand the workflow.
Ready to open an IBKR account?
Fund in EUR, convert in planned chunks (€1,000+), buy from your USD cash balance. Check for negative balances after every trade. That’s the entire workflow.
Go deeper
Frequently asked questions
How much does IBKR charge for currency conversion?
Manual conversion costs 0.08–0.20 basis points of the trade value, with a $2 minimum per trade. Auto-conversion charges 0.03% with no separate commission. On a €5,000 conversion: manual costs ~€2 and auto costs ~€1.50. Both are far cheaper than DEGIRO (0.25%) or Trading 212 (0.15%).
Do I need to convert EUR to USD before buying US stocks or ETFs?
Strongly recommended. If you buy a USD asset without USD cash, IBKR lends you the USD and charges margin interest (roughly 5.5–6.5% annualised). The correct workflow: fund in EUR → convert to USD in planned chunks → buy from your USD cash balance.
What happens if I buy a USD ETF without converting first?
IBKR creates a negative USD cash balance — effectively a margin loan charged at daily interest. Many beginners don’t notice for weeks. Always check your cash balances after every trade and convert EUR to cover any negative balance immediately.
What is “base currency” at IBKR?
Base currency determines how your statements, P&L, and portfolio value are displayed. It does not automatically convert your actual cash. Changing base currency from EUR to USD changes your statements — your EUR cash stays as EUR until you manually convert it.
Should I convert EUR to USD or buy EUR-denominated UCITS ETFs?
If your target ETF has a EUR-listed UCITS version (e.g. VWCE on Euronext Amsterdam, CSPX on Euronext), buying in EUR avoids FX conversion entirely. For most European investors, EUR-denominated UCITS ETFs are the simpler and cheaper path. FX conversion only makes sense if you specifically need a USD-denominated instrument that has no EUR equivalent.
Can I automate currency conversion on IBKR?
There’s no recurring conversion feature. You can enable auto FX (0.03% markup), which triggers automatically when you buy assets in a currency you don’t hold. For deliberate conversions, you log in and convert manually. A simple calendar reminder on your conversion day is the easiest workaround.
When is the best time to convert currency on IBKR?
During the European/US market overlap: roughly 14:00–17:00 CET (8:00–11:00 ET). EUR/USD spreads are tightest when both London and New York are active. Avoid off-hours, weekends, and the minutes around major economic releases (NFP, CPI, Fed decisions).
Can I hold both EUR and USD in my IBKR account?
Yes — multi-currency balances are a core IBKR feature. You can hold EUR, USD, GBP, CHF, and dozens of other currencies simultaneously. This is a genuine advantage: you choose when to convert rather than being forced into constant auto-conversion on every transaction.
What happens to dividends from USD assets?
USD dividends arrive as USD cash — IBKR does not auto-convert them. You can leave them in USD for your next purchase, or batch-convert back to EUR periodically. Don’t convert each small dividend payment individually — the $2 minimum makes that expensive. Accumulating ETFs sidestep this entirely since no cash dividends are paid out.
Is IBKR FX conversion cheaper than DEGIRO or Trading 212?
Significantly. IBKR auto-conversion is 0.03% vs DEGIRO’s 0.25% and Trading 212’s 0.15%. On a €5,000 conversion that’s ~€1.50 (IBKR) vs ~€12.50 (DEGIRO) vs ~€7.50 (Trading 212). Over years of monthly conversions, the compounded difference is substantial. See the FX drag study for the full numbers.
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