Interactive Brokers Review 2026: The Pro Broker's Moat

The Q1 2026 results landed on April 21 after the close. Five things stand out.

Accounts grew 31% YoY to 4.75 million. Q4 2025 ended at 4.40 million accounts. March's monthly metrics flagged 4.754 million. Q1 closed at 4.75 million. That is roughly 350,000 net new accounts in a single quarter — the fastest absolute growth in any quarter since 2022 — at a scale where most peers grow under 5%. Charles Schwab's retail account growth runs in the low single digits.

DARTs hit 4.4 million per day, up 24%. Daily Average Revenue Trades is the cleanest measure of platform engagement. 4.4 million is a record and reflects two distinct tailwinds: VIX has averaged in the high teens (closing 18.29 on May 4 per FRED's VIXCLS series) and the customer base now includes a meaningful options-active cohort that did not exist 18 months ago.

Commission revenue grew 19% to $613 million. This is the line that vindicates the IBKR Pro pricing model. Even in a quarter when the Fed cut and net interest income headwinds set in, customer trading volume more than offset the rate drag. Pretax profit margin actually expanded — 74% a year ago to 77% in Q1.

Uninvested customer cash hit a record $169 billion. Up 35% YoY. This is the source of IBKR's net interest income, which is the more volatile half of the business. With Fed funds at 3.64%, IBKR earns roughly that on the float and pays out 3.14% on Pro USD balances above $10K (and zero on the first $10K). The arithmetic difference times $169 billion is meaningful — and the $10K-floor structure means the implicit margin is wider than 50 basis points on aggregate.

Dividend raised from $0.08 to $0.0875 per share. A 9.4% hike. Modest in dollar terms, signal-rich in framing — IBKR rarely touches the dividend, so a raise reads as management confidence in cash flow durability through the rest of the year.

IBKR's fee structure is genuinely the cheapest available — and genuinely complicated. Two plans, two pricing models within Pro, different rates for every asset class, and different cash-interest economics for accounts under $100K.

IBKR Lite (free trading)

• US stocks and ETFs: $0 commissions on exchange-listed securities
• Options: $0.65 per contract (fixed)
• Futures: $0.85 per contract (fixed)
• Margin: Benchmark + 2.5% (currently 6.14% with Fed funds at 3.64%)
• Cash interest: Benchmark − 1.5% — currently up to 2.14% on USD over $10K
• The catch: Lite uses payment for order flow. "Free" trades are subsidised by potentially worse execution prices.

IBKR Pro (active traders)

• US stocks/ETFs (Tiered): $0.0005 to $0.0035 per share — volume discounts kick in automatically
• US stocks/ETFs (Fixed): $0.005 per share, all-in (includes exchange and regulatory fees)
• Options: $0.15 to $0.65 per contract (tiered) or $0.65 flat (fixed)
• Futures: $0.25 to $0.85 per contract (tiered) or $0.85 flat (fixed)
• Cash interest: Benchmark − 0.5% — currently 3.14% on USD over $10K
• No PFOF: Pro uses IB SmartRouting for best execution

IBKR Pro USD margin rates by balance tier (May 2026):

Benchmark is the IBKR Benchmark Rate, which tracks the effective Fed funds rate — currently 3.64% per FRED's FEDFUNDS series. When the Fed moves, every IBKR rate moves the same day. One underappreciated consequence of Fed cuts for income-focused investors is that the cash-yield advantage IBKR has over zero-commission competitors narrows in absolute terms even though the relative gap stays wide.

No hidden fees on either plan: $0 account minimum, $0 maintenance, $0 inactivity, no platform fees, no added spreads.

Other costs to know:

• Bonds: 10 basis points × face value
• Mutual funds: up to 3% × trade value, capped at $14.95 (but $0 on no-transaction-fee funds)
• Spot currencies: 0.08 to 0.20 basis points × trade value
• International market data: paid subscriptions, typically $5–30/month per exchange, sometimes more for Level II

The margin-rate comparison is still the headline. At 5.14% for a $50K margin loan on Pro, IBKR charges roughly half what Schwab or Fidelity do (both around 11–13% at the under-$100K tier after the Fed cut). On a $500K margin balance, the difference is still over $30,000 per year. Cash interest tells the same story — Schwab pays 0.05% on bank-swept cash, IBKR pays 3.14%. We work the dollar implications below.

This is where IBKR has no real competition among retail brokers. From a single account:

• Stocks on 90+ market centres globally — Tokyo, London, Frankfurt, Sydney, Hong Kong, and dozens more
• ETFs including 150+ no-transaction-fee options
• Options — US and international, with tiered pricing that rewards volume
• Futures and futures options across global exchanges
• Bonds — over 1 million, including US Treasuries with near-24-hour trading
• Mutual funds from 500+ fund families
• Spot currencies (forex) with spreads as narrow as 1/10 of a pip
• US Spot Gold
• Forecast/prediction contracts on political, economic, and climate events (ForecastEx, CFTC-registered, launched Q1 2026)
• Fractional shares for US securities

That adds up to 170 markets across 40 countries in 29 currencies. If you want to buy Sony in Tokyo, Nestlé in Zurich, or BHP in Sydney — without routing through ADRs and paying ADR custody fees — IBKR is essentially your only mainstream option among US-domiciled brokers. The closest competitor on global access is a private bank, and a private bank's commissions are a different conversation entirely.

The prediction-markets addition is worth calling out. ForecastEx is CFTC-registered, which matters: it is a regulated derivatives exchange, not a grey-market offshore venue. Contracts settle at $1 for correct predictions and $0 for incorrect, with intraday prices implying probability. If you have ever wanted to hedge portfolio exposure against a specific political or macro outcome — a rate cut, an election result, a tariff announcement — this is now available inside the same account that holds your stocks. Volumes are still small versus Kalshi or Polymarket, but IBKR's distribution advantage is real, and the regulated exchange wrapper makes it usable for advisors and trusts that cannot touch grey-market venues.

Account types cover everything: individual, joint, trust, UGMA/UTMA custodial, Traditional IRA, Roth IRA, Rollover IRA, SEP IRA, SIMPLE IRA, plus institutional accounts for advisors, hedge funds, and prop trading groups. All individual and retirement accounts qualify for IBKR Lite.

Here is the concrete arithmetic almost no one runs on the brokerage they pick. IBKR Pro pays 3.14% on USD cash balances above $10,000 for any account with a Net Asset Value over $100,000. Lite pays 2.14%. The first $10,000 of cash earns nothing on either tier. IBKR's own published comparison table (rates as of April 8, 2026) shows what every other major US firm pays on default brokerage cash:

Broker	Default cash rate	Source
Interactive Brokers Pro	3.14%	IBKR Interest Rates page
Wells Fargo	0.050%	IBKR comparison table
Citi	0.030%	IBKR comparison table
JP Morgan	0.020%	IBKR comparison table
Charles Schwab (Bank Sweep)	0.010%	IBKR comparison table
Bank of America	0.010%	IBKR comparison table
E*TRADE	0.010%	IBKR comparison table

The dollar arithmetic on $100,000 of idle cash, NAV ≥ $100K, IBKR Pro:

• Eligible cash: $100,000 − $10,000 floor = $90,000 earning 3.14%
• Annual interest: $90,000 × 3.14% = $2,826
• Same balance at Schwab Bank Sweep (0.05%): $100,000 × 0.05% = $50
• Annual cash drag at Schwab: $2,776
• Over 5 years (no compounding): $13,880
• With re-invested interest at the same rate: roughly $15,050

The arithmetic on $250,000 of idle cash:

• Eligible cash at IBKR Pro: $240,000 × 3.14% = $7,536/year
• Same at Schwab Bank Sweep: $125/year
• Annual cash drag: $7,411

This is not a marginal number. A $100K cash position earning 3.14% throws off enough income to cover an IRA contribution every year. A $250K cash position earning 3.14% compounds to material six-figure differences over a decade — and you do not have to lift a finger.

Three caveats matter:

One — the $10K floor compresses the rate at smaller balances. A $20,000 cash position at IBKR Pro earns 3.14% on only $10,000 of it, so the effective blended rate is 1.57%. At a $50,000 balance, blended rate ≈ 2.51%. The headline rate only matches the dollar maths once you push past $50K of idle cash and meet the $100K NAV floor.

Two — Lite is meaningfully worse but still beats every cash sweep. Lite pays 2.14% (Benchmark − 1.5%) versus Pro's 3.14%. On $100K of cash that gap is $1,000/year. But Lite's 2.14% still beats the 0.01–0.05% offered by Schwab/Fidelity-style bank sweeps by a factor of 40-200x.

Three — Fidelity SPAXX and Vanguard VMFXX are the honest comparators, not bank sweeps. Fidelity SPAXX is yielding around 3.29% and Vanguard VMFXX around 3.64% — both above IBKR's 3.14%. The catch: SPAXX and VMFXX are money-market funds you have to actively buy and hold, not the default sweep. The default sweep at Schwab is the bank product at 0.05%; the default at Fidelity is FCASH at roughly the same; at IBKR, the default is the 3.14% accrual itself. The gap is largest in absolute dollars when comparing IBKR's default to a Schwab-style bank-sweep default — which is the comparison most retail investors actually face if they are not paying close attention.

If you want to skip the sweep math entirely and just hold 3-month T-bills at 3.68% or a 6-12 month treasury ladder, IBKR makes that easy too — its bond commission is 10 bps × face, the lowest published rate at any major US broker. But for genuinely idle cash you might need on short notice, the IBKR sweep at 3.14% is closer to a high-yield savings account than to a brokerage default.

Most prospective IBKR clients ask the wrong question first. They ask which plan has the better commission rate. The answer turns out to depend on what kind of investor you are, what you trade, and how often.

Use this decision tree. Pick the first branch that fits, and stop there.

1. Do you use margin, ever, even occasionally? → Yes: pick Pro. The 100-basis-point spread between Lite (6.14%) and Pro (5.14% at the entry tier) on margin is the largest single-line economic difference between the two plans. On a $20,000 margin balance held for a year, Pro saves you $200. On $100,000, Pro saves $1,000. There is no scenario in which the higher commission costs of Pro outweigh that. If you carry margin even occasionally, Pro is correct. Stop here.

2. Do you trade options as your primary strategy? → Yes: pick Pro. The options pricing gap is real. Lite charges $0.65 flat per contract. Pro tiered pricing starts at $0.15 per contract once you cross 100 contracts/month. On 200 monthly contracts, Pro saves you about $100/month versus Lite. SmartRouting also delivers measurably better execution prices on multi-leg orders versus a PFOF-routed order, which compounds on options spreads. If options are your thing, tastytrade is competitive — but Pro is still your IBKR plan.

3. Do you care about execution quality on US stocks because you trade in size? → Yes: pick Pro. PFOF on Lite means your $0 commission is paid for through the wholesaler's spread. On a $10,000 order, the typical PFOF cost is in the range of $1-3 in worse fill price. On a $50,000 order, it is more. Pro's SmartRouting routes for price improvement and the difference shows up in transaction-cost-analysis (TCA) reports that institutional clients receive. Active traders moving more than $25K of stock per trade should be on Pro.

4. Will you carry $50,000+ in idle cash at IBKR with NAV ≥ $100K? → Yes: pick Pro. The 100-basis-point gap on cash interest (3.14% vs 2.14%) is worth $500-$1,000+ per year on $50K-$100K of cash. Same logic as margin — there is no scenario in which Pro's commissions cost more than that gap. Pick Pro and forget about it.

5. Are you a buy-and-hold US stock and ETF investor with under $50K who places fewer than 5 trades per month? → Pick Lite, and consider whether you should be at IBKR at all. Lite's $0 commissions on US stocks and ETFs cost you nothing on this profile. The PFOF execution penalty on small infrequent trades is negligible. The 100-basis-point gap on cash matters less because you have less idle cash. The 100-basis-point gap on margin does not apply because you are not borrowing. But for this exact profile, Fidelity is genuinely a better experience — easier interface, better customer service, integrated banking, and SPAXX yielding 3.29% on cash if you actively buy it. The only reason a small buy-and-hold US-only investor should be at IBKR is if they want the option to upgrade later without changing brokers.

6. Do you trade outside the US? → Pick Pro. Lite is technically available for international trades but the per-share commission structure on non-US stocks is worse than Pro tiered, and IBKR steers international traders toward Pro by default in the application flow. If you trade Tokyo, London, Frankfurt, or any other non-US exchange more than occasionally, Pro is the only sensible choice.

The reclassification escape hatch. Either plan, you can switch to the other at any time. Your first three switches in any 12-month period are processed daily. Subsequent switches happen quarterly. So if you start on Lite and grow into margin or options, the upgrade is one form. The reverse is true if you decide the simpler Lite economics suit you better.

Default for almost everyone reading this article: Pro. The audience self-selecting into a deep IBKR review is, by definition, the audience IBKR Pro is built for.

What IBKR does better than anyone:

Margin rates are the clearest differentiator. At 4.14–5.14% on Pro versus 11–13% at Schwab, Fidelity, or E*TRADE, anyone who borrows against their portfolio is leaving money on the table by not being at IBKR. The math got slightly less compelling after the March Fed cut — every broker's margin rate dropped in lockstep — but the spread is still 5–7 percentage points.

Cash earns real money. Up to 3.14% on Pro accounts over $100K, with uninvested cash covered by the Insured Bank Deposit Sweep Program — up to $5.25 million FDIC coverage for individual accounts and $10.25 million for joint accounts. That is significantly more protection than the standard $250K SIPC limit at most brokers.

The trading tools are institutional-grade and free. Trader Workstation (TWS), IBKR Desktop, mobile apps, Client Portal, 100+ order types, algorithmic trading, API access, paper trading — no additional cost. The Stock Yield Enhancement Program lets you earn extra income lending out fully-paid shares, a feature most retail brokers do not offer at all.

Financial stability is a genuine fortress. IBKR carried $21.3 billion of equity capital at the most recent disclosure, is Nasdaq-listed, and is an S&P 500 component. Q1 2026 revenue was $1.67 billion ($1.68B adjusted), and the firm has now posted adjusted pretax income above $1 billion for six consecutive quarters. Operating history reaches back over 50 years. This is not a startup.

Where IBKR falls short:

Complexity is the tax you pay for power. TWS was designed by quants and it shows. Even the streamlined IBKR Desktop has more knobs than most retail investors need. New users will spend their first week just figuring out how to place a basic limit order with the right time-in-force.

International market data costs add up. US stock and ETF data is free, but a serious global trader could spend $30–100 per month on data subscriptions for non-US exchanges and Level II. None of the comparable big-broker reviews have to disclose a separate data-fee table because they do not offer the global market access in the first place.

The cash-interest tier penalty hurts smaller accounts. Under $100K NAV, you earn proportionally less than the headline 3.14% — a $50K account earns roughly half. The first $10,000 in cash earns nothing on any account at any tier. If you are a small investor whose primary cash strategy is the brokerage default sweep, the sweep at IBKR is genuinely good for the slice above $10K but dilutive on the slice below.

Customer service is functional, not friendly. IBKR is built for self-sufficient traders. Phone support exists but waits are real and reps default to assuming you know what you are doing. If you want hand-holding through your first margin call, Fidelity and Schwab are dramatically better.

The Karta charge card, the IRA bonuses, and the integrated banking products that exist at Schwab and Fidelity — IBKR has thinner versions of each. The Karta Visa Infinite is a charge card targeted at high-net-worth international travellers, not a debit card for everyday spending. If you want your broker to also be your checking account, this is not the broker.

Open an IBKR account if you are:

• An active trader who wants sub-penny per-share costs and SmartRouting execution. The tiered Pro pricing rewards volume, and execution quality is measurably better than PFOF brokers.
• A margin user. Period. The rate differential versus Schwab or Fidelity is thousands of dollars per year on any meaningful borrowed balance, and the math compounds.
• An international investor who wants direct exchange access, not ADR wrappers. Nobody else gives retail investors clean access to 170 markets from a single login.
• Sitting on a six-figure cash balance and want competitive interest. 3.14% beats every default sweep in the country, and the $5.25M FDIC coverage is unmatched. The cash drag math earlier in this review is worth running before assuming your current broker is fine.
• Interested in prediction markets as a hedging or speculation tool. ForecastEx now lives inside the same account — no need to move money to Kalshi or Polymarket.
• Long IBKR equity itself and want to pay yourself the dividend twice — once through the stock holding, once through the cash sweep on uninvested funds the same business is generating.

Look elsewhere if you are:

• A true beginner. Robinhood, Fidelity, or Schwab are dramatically more approachable. IBKR's Lite plan makes it technically accessible, but the interface will overwhelm new investors.
• A buy-and-hold investor with under $100K. The complexity is wasted, the proportional interest penalty stings, and a simple three-fund portfolio at Vanguard requires zero thought.
• Someone who wants integrated banking. Schwab and Fidelity offer checking, debit cards, and seamless cash management. IBKR has the Karta card but it targets a different audience.
• Looking for a built-in robo-advisor. IBKR's Interactive Advisors service exists as a separate entity, but Schwab Intelligent Portfolios and Fidelity Go are more tightly integrated with the main account.
• Trading purely options at low volumes. tastytrade caps commissions at $10 per leg and is purpose-built for options-first workflows.

The pattern: IBKR is a graduate-level broker. Open it when you start using margin, trading options seriously, investing internationally, or accumulating enough cash to earn meaningful interest. Underneath those four use cases, there are simpler brokers that fit better.

vs. Fidelity: Still the best all-around broker for most Americans — zero-fee index funds, excellent research, great service. But IBKR crushes Fidelity on margin rates (5.14% vs ~11.6%) and global market access. On default cash, IBKR's 3.14% sweep beats FCASH; SPAXX at 3.29% (which you have to actively buy and hold) is the only Fidelity cash product that meaningfully competes. If you trade actively, use margin, or invest internationally, IBKR wins on cost. If you mostly buy index funds and want one app for everything, Fidelity wins on convenience.

vs. Schwab: Better banking, better support, far larger branch network. But Schwab's margin rates run around 11–12% after the Fed cut, and uninvested cash earns 0.05% on the default Bank Sweep — that is roughly $3,000 per year of give-up on $100K versus IBKR Pro. Schwab absorbed TD Ameritrade's thinkorswim platform, which is powerful, but IBKR's tools and pricing remain a tier above for active traders. The head-to-head with Vanguard mixed in is also worth reading if you are choosing among the big three.

vs. Robinhood: Both offer $0 stock trades. Robinhood is simpler, prettier, runs prediction markets of its own, and now charges $5/month for Robinhood Gold features that IBKR bundles for free. But IBKR offers far more asset classes, better margin rates, pays real interest on idle cash, doesn't gamify investing, and has 50 years of operating history versus Robinhood's decade. One is a mobile app with a broker attached; the other is a broker with a mobile app attached. The right pick depends on which side of that distinction you care about.

vs. E*TRADE: ETRADE gives you Morgan Stanley research, a clean platform, and solid banking integration. But margin rates are still in the 10–12% zone, default cash earns 0.01% per IBKR's own comparison table, and you cannot trade Tokyo or Frankfurt from a single login. For active US-focused traders, ETRADE is competitive on the trade itself. For anyone whose use case extends beyond US equities and options, IBKR is the cost winner.

vs. tastytrade: tastytrade is an options specialist with a $10 commission cap per leg — genuinely differentiated if options are your main thing. The interface is options-first in a way that IBKR's TWS is not. But tastytrade is narrower (options-first), less deep on international access, and does not match IBKR on margin or cash rates.

vs. Public.com and Webull: Both are gen-Z-friendly platforms with payment-for-options-flow models that are economically opaque. Public's bond account is a real differentiator at 5.73% yield, but at the IBKR scale you would just buy the underlying 3-month T-bills at 3.68% directly. Webull's free options trading hides costs in PFOF and assignment fees that IBKR doesn't charge. Both are fine for casual traders. Neither competes for the IBKR target audience.

vs. M1 Finance: M1 is automation-first — pies, recurring buys, automated rebalancing. Useful for hands-off investors who want a more sophisticated tool than Acorns but are willing to pay $3-10/month for it. IBKR has automation features but they are not the product.

The bottom line: if low costs and global access are your priorities, IBKR has no real competitor. If ease of use and customer support matter more, Fidelity is the better choice. If you fall in between, run the margin and cash drag arithmetic from the section earlier in this review — the differences are usually larger than people assume.