Start with the entity, account and pricing plan
This is a document-based review, checked September 10, 2026, not a claim of personal trading experience. Interactive Brokers operates through different entities and offers different plans by residence and account type. The U.S. schedule below must not be assumed to apply to every customer worldwide.
The U.S. IBKR Lite overview describes eligibility for U.S.-resident individual, joint, IRA and qualifying trust accounts and certain advisor clients. Trust conditions and non-retail-order exclusions apply. A global market-access claim does not establish that a particular customer has permission to trade a particular product.
A per-share fee needs its minimum and exclusions
| U.S. stock schedule | Published base commission | Per-order minimum | Qualification |
|---|---|---|---|
| IBKR Pro Fixed | $0.005 per share | $1 | U.S. schedule caps and applicable charges |
| IBKR Pro Tiered, first monthly volume band | $0.0035 per share | $0.35 | Up to 300,000 shares/month; external fees or rebates separate |
| IBKR Lite | $0 for qualifying U.S. exchange-listed stocks/ETFs | Program terms | Eligibility and order exclusions; other charges can apply |
Source: IBKR U.S. stock commission schedule. Assume ordinary whole-share orders of a fictional $50 stock, with no special routing or external charge. A 20-share order has $0.10 raw Fixed commission but pays the $1 minimum; Tiered has $0.07 raw commission but a $0.35 base minimum. A 1,000-share order has base charges of $5 and $3.50 respectively. These examples are not all-in Tiered execution quotes.
The currency commission is not the exchange-rate spread
The spot-currency schedule lists a 0.20-basis-point commission in its first volume tier, equivalent to 0.002% of trade value, with a $2 minimum. Calling this a 0.002% spread is incorrect. The execution rate and commission are different components.
The same schedule says the automatic currency-conversion service typically adds or subtracts 0.03% to the exchange rate and does not separately charge a commission, subject to its stated discretion and account applicability.
| Illustrative USD-equivalent conversion | Manual commission: max(value × 0.002%, $2) | Automatic 0.03% rate adjustment |
|---|---|---|
| $1,000 | $2 | $0.30 |
| $10,000 | $2 | $3 |
| $100,000 | $2 | $30 |
The $2 minimum equals a 0.03% adjustment at about $6,666.67. This is a narrow fee-component comparison, not proof of which method achieves a better total execution rate: market spreads, timing, available conversion routes and account terms can differ. Small repeated conversions can make the minimum more important than the advertised percentage.
Separate cash conversion from borrowing
Inspect each currency’s cash balance after a trade. A reporting or base currency is not evidence that all other currency balances have been converted. A negative balance may create borrowing costs under the account agreement. Confirm trading and margin permissions, settlement and automatic-conversion behavior before relying on a workflow.
Hypothetically, a $10,000 loan held for a year at an unchanged 6% simple rate costs $600, far more than a $2 commission. Actual margin pricing can vary by currency, balance tier and day count. Margin can magnify losses and lead to liquidation; this article does not rank IBKR as the universally cheapest lender or recommend borrowing.
A review should end with an order-specific cost record
Record the intended market and ticker, order size, pricing plan, regulatory/exchange costs, market-data subscription, currency route and any expected debit balance. Then compare the preview and account agreement. The service may suit a user needing supported international-market and currency operations, while another user may find a simpler domestic workflow sufficient. Product breadth and low headline rates are useful only when the actual account can execute the required task at an understood total cost.
Sources checked September 10, 2026. Calculations identified as examples are hypothetical, not investment performance or forecasts. General information; investments can lose value. Investment disclaimer.
References
3- U.S. stock commissions, tiers and footnotes (opens in a new tab) Interactive Brokers · Current document; checked 2026-09-10
- Spot currency commissions and automatic conversion (opens in a new tab) Interactive Brokers · Current document; checked 2026-09-10
- IBKR Lite overview and account conditions (opens in a new tab) Interactive Brokers · Current document; checked 2026-09-10
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