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, how cash and margin accounts behave differently, settlement timing, 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.
- Settlement: EUR/USD conversions typically settle T+1. Cash accounts need settled funds before trading.
- Buying USD assets without converting first — creates margin borrowing in margin accounts, or trade rejection in cash accounts.
- Converting €200 at a time — $2 on €200 = 1% effective fee. Batch instead.
- Changing base currency and expecting cash to convert automatically.
- Converting every last euro — leave a small EUR buffer for fees.
- 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+.
- Order type: use a limit order in TWS for price control on large amounts; the Convert Currency tool places a market order.
- 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 mainly controls how your statements, P&L, and portfolio are displayed. It can also affect margin calculations, some fees and charges, and cash-account product currency rules. 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.
In a margin account, 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 margin interest — currently around 5.5–6.5% annualised depending on currency and tier. In a cash account, the trade may be blocked or auto-converted depending on your account setup. Many beginners don’t notice margin interest for weeks.
Fix: always check your cash balances before buying. Convert EUR→USD first, then buy from your USD balance. See the cash vs margin section below for the full breakdown.
Cash account vs margin account: how FX behavior differs
The most important variable for IBKR currency conversion is your account type. The same action produces a different outcome depending on whether you hold a cash or margin account.
- Cannot have a negative currency balance by design.
- Buying a USD asset without USD cash may be rejected, unless eligible auto-FX is triggered.
- Converted funds must fully settle (T+1) before you can use them to buy. IBKR may show the balance before settlement completes.
- Some product currency permissions may depend on your base currency setting.
- Trade can go through even without the required currency — creates a negative balance.
- Negative balances accrue daily margin interest at around 5.5–6.5% annualised.
- Converted funds are generally available to trade immediately, before T+1 settlement.
- Falling below margin requirements due to currency moves can trigger automatic liquidation of positions.
| Situation | Cash account | Margin account |
|---|---|---|
| Buy USD asset, no USD cash | Trade rejected or eligible auto-FX triggers | Trade executes — negative USD balance + margin interest |
| Convert EUR→USD, buy immediately | May need to wait for T+1 settlement first | Generally usable before settlement clears |
| Recurring investment, no trade currency | May auto-convert or reject | May auto-convert or create negative balance |
| FX move against you after conversion | No liquidation risk — no leverage | Possible margin call if requirements not met |
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. Leave a small EUR buffer — see Mistake #6 below.
- Wait for settlement if you hold a cash account. Check “Available Funds” before buying, not just your balance total.
- 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. Note: trading in EUR does not eliminate the ETF’s underlying USD exposure, only the broker-level conversion cost.
| 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
Three routes: Client Portal (recommended), TWS (more control), and GlobalTrader (mobile). Most investors only need Client Portal.
- Log in to Client Portal (portal.interactivebrokers.com).
- Go to Trade → Convert Currency. If you can’t find it, use the portal search bar and type “Convert Currency” — IBKR occasionally reorganises menu layouts.
- 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. The Convert Currency tool places a market order — if you want a specific limit rate, use TWS instead.
- Submit. Go to Account → Balances and confirm USD cash increased and EUR cash decreased.
- 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 and price control.
- After execution, verify EUR cash decreased and USD cash increased in the Account window.
IBKR GlobalTrader (the newer mobile-first app) has a dedicated Convert icon on the home screen. Steps: tap Convert → select the currency pair (EUR → USD) → enter the amount → preview → slide to confirm. It’s the simplest interface and has fewer ways to make mistakes, but offers less control than TWS limit orders.
| Interface | Best for | Notes |
|---|---|---|
| Client Portal | Most desktop users | Cleanest workflow; market order only via Convert Currency tool |
| GlobalTrader | Mobile users | Simplest interface; dedicated Convert button on home screen |
| TWS | Advanced users | Best for limit orders, large conversions, closing residual balances |
| IBKR Mobile | Secondary option | Useful if already familiar; similar to GlobalTrader but older UI |
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 in TWS if you want a specific rate — gives you price control on larger amounts.
- 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)
In a margin account, IBKR lends you USD at 5.5–6.5% annualised margin interest and most beginners don’t notice for months. In a cash account, the trade may simply fail.
Fix: always check your cash balances before buying. Convert EUR→USD first, then buy from your USD balance. Check “Available Funds” not just total balance.
Base currency is primarily a reporting setting — it also affects some fee billing and margin calculations, but it does not move your actual cash. Switching from EUR to USD base changes your statements, not your EUR balance.
Fix: use Trade → 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.
If EUR is your base currency, some IBKR fees and charges may be billed in EUR. If you convert 100% of your EUR cash, IBKR may later auto-convert a small amount back to cover a fee — creating unnecessary tiny FX transactions at their cost.
Fix: leave a small EUR buffer (€50–100) in your account if EUR is your base currency. Enough to cover any fee charges without triggering back-conversions.
After selling USD assets, receiving dividends, or partial conversions, you can be left with small residual USD or GBP balances sitting idle. These don’t earn meaningful interest at small amounts and add clutter to your statements.
Fix: in TWS, use Close Currency Balance from the Market Value / Real FX section to convert residual balances back to base currency. Don’t overuse it for cents — only worth doing when the residual is meaningful enough to justify the $2 minimum.
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. In a margin account, buying a USD asset without USD cash creates a negative USD balance — IBKR lends you USD and charges margin interest at roughly 5.5–6.5% annualised. In a cash account, the trade may simply be blocked. 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?
In a margin account, IBKR creates a negative USD cash balance — a margin loan charged at daily interest. Many beginners don’t notice for weeks. In a cash account, the trade may be blocked or auto-converted at 0.03% depending on your settings. 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 primarily controls how your statements, P&L, and portfolio value are displayed. It can also affect margin calculations, some fee billing, and cash-account product currency permissions. It does not automatically convert your actual cash. Changing base currency from EUR to USD changes your reporting — 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 broker-level FX conversion entirely. Important distinction: trading in EUR removes the broker FX cost at purchase but does not remove the ETF’s underlying currency exposure — a EUR-listed world ETF still holds USD-denominated companies. The EUR trading currency affects your broker costs; the fund’s underlying currency affects your investment exposure. These are separate things.
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.
What does a currency conversion notification from IBKR mean?
IBKR sends conversion notifications when it converts currency to settle a trade, charge a fee, complete a recurring investment, or cover a negative balance. Common causes: buying a USD asset without USD cash in hand, recurring investment executions, or fees being charged in your base currency when you have no balance in it. To identify the source, go to your Activity Statement in Client Portal and check the Trades and Cash Report sections for the date in question.
How does settlement timing affect currency conversion on IBKR?
EUR/USD forex transactions typically settle in one business day (T+1). Your account balance may visually update before settlement completes. For cash account holders, this matters: if you convert EUR to USD and immediately try to buy, your order may fail or be delayed because the converted funds aren’t yet fully settled. Check the “Available Funds” or “Settled Cash” figure — not just the total balance — before placing a buy order after converting. Margin accounts generally allow trading against converted funds before T+1 settlement clears.
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