Interactive Brokers Review 2026: Fees, FX Costs, and Is It Worth It?

Interactive Brokers was founded in 1978 and went public in 2007. It is regulated in the US (FINRA, SEC), UK (FCA), EU (CySEC), Australia (ASIC), and more than 15 other jurisdictions. As of 2025, it holds over $500 billion in client assets and executes more than 2 million trades per day.

• FX conversion: 0.1% (min $2) through IBKR's own forex desk
• Commission: $0.005 per share (US stocks), with IBKR Lite offering $0 commissions
• Interest on idle cash: up to 4.83% on USD (as of early 2026)
• Margin rates: among the lowest in retail brokerage (~6% USD base)
• Account minimum: $0 for cash accounts; $2,000 for margin
• Inactivity fee: none (removed in 2021)

For non-US investors funding in a local currency, FX conversion is often the largest hidden cost of investing globally. IBKR charges 0.1% of trade value (minimum $2) for currency conversions, compared to 0.5–1.5% at most retail alternatives. On a $50,000 portfolio rebalance, that difference can be $200–$700 per transaction.

To convert currency on IBKR, you need to use the Forex section of Trader Workstation (TWS) or the IBKR Mobile app. Navigate to the Forex section, select the currency pair (e.g., GBP.USD), enter the amount, and execute. The conversion settles T+1 and your base currency balance updates immediately for trading purposes.

IBKR offers two main account tiers: IBKR Pro and IBKR Lite (US residents only). IBKR Pro uses a tiered commission structure and accesses the full suite of order types, algorithmic tools, and SmartRouting. IBKR Lite offers $0 commissions on US stocks but uses payment for order flow (PFOF), meaning execution quality is slightly lower.

For international investors (non-US), only IBKR Pro is available. The commission structure is fixed at $0.005/share for US stocks with a $1 minimum. For most individual investors buying fewer than 200 shares at a time, the fixed $1 minimum makes the effective commission higher than advertised — factor this into your analysis.

Trader Workstation (TWS) is IBKR's desktop platform and is genuinely professional-grade. It supports over 100 order types, options strategy builders, portfolio analytics, and real-time data from 150+ global markets. The learning curve is steep — expect 2–4 weeks before you're comfortable navigating it efficiently.

The mobile app and Client Portal (web) are significantly more accessible. Most individual investors can do everything they need — fund accounts, place market/limit orders, convert currency, and review positions — through the web interface alone. TWS is worth learning if you trade options, futures, or need advanced charting.

• Platform complexity: TWS intimidates new investors; onboarding takes effort
• US estate tax risk: non-US clients holding US-domiciled ETFs face US estate tax on assets above $60,000 — use UCITS alternatives
• Currency conversion requires manual steps: no automatic sweep unlike some brokers
• Customer support: available, but not known for speed on complex queries
• Fractional shares: available for US stocks but not always for international equities

IBKR is best for investors who: (1) are investing meaningful sums ($10,000+), (2) need access to global markets beyond their home country, (3) are willing to invest time in learning the platform, or (4) are already experienced investors frustrated by high FX spreads at their current broker.

It is probably not right for: first-time investors who want hand-holding, people investing small amounts where the learning curve doesn't pay off, or anyone who wants a sleek consumer-grade UX above all else.