Interactive Brokers vs Fidelity: which is better in 2026?

The scores are close — Fidelity 4.8, Interactive Brokers 4.7 — and that closeness hides how little these two actually compete for the same trader. This isn’t Schwab vs Fidelity, where two near-identical firms split hairs. It’s a professional’s instrument against an investor’s home. One is the broker a small fund would run on; the other is where a doctor’s 401(k) rollover should probably live.

So the useful question isn’t “which is better.” It’s “which are you.” Do you trade on margin, want direct access to Tokyo and London, run futures, or care about shaving basis points off execution at size? That’s IBKR. Or are you building wealth over decades in US stocks, ETFs, and index funds, and you’d rather the account manage your idle cash and your fills without being asked? That’s Fidelity. Answer that and the rest is detail.

What everyone compares vs. what actually matters

The usual comparison fixates on commissions. It shouldn’t. Both charge $0 on US stocks and ETFs (IBKR via its Lite tier, Fidelity flatly) and both have no account minimum. On the headline number this is a wash, and anyone ranking one “cheaper to trade” is missing the real cost drivers.

Three things actually separate them:

Margin and cost at scale. IBKR runs among the lowest margin rates in the industry and the most competitive underlying pricing we track — the reason it earns a 4.9 on fees, the highest fee score we award. Fidelity’s margin rates are middling-to-high. If you borrow, this isn’t close.

What your cash and your fills do when you’re not watching. Fidelity’s core position sweeps into SPAXX, a government money market fund yielding roughly 3.3% as of mid-2026, automatically, and it takes no payment for order flow on equities. IBKR pays competitive interest on cash and avoids PFOF too — but only on IBKR Pro, and only if you pick the right tier on the way in.

Breadth of what you can even trade. IBKR reaches 150+ markets in 30-plus countries, plus futures and forex. Fidelity is US-centric with no futures and only a narrow crypto menu. If your strategy needs those, Fidelity can’t be the answer regardless of its rating.

The IBKR fork that decides everything: Lite vs Pro

Before the head-to-head, one thing about IBKR that has no equivalent at Fidelity: the tier you choose changes the entire cost story.

IBKR Lite gives you $0 US stock and ETF commissions — but it routes orders through payment for order flow, pays less interest on idle cash (roughly benchmark minus 1.5%), and charges more on margin. It’s the tier that looks like Fidelity on the surface and quietly costs more underneath.

IBKR Pro charges tiered commissions from $0.0035/share (options from $0.65 down to $0.15 at volume) but avoids PFOF entirely via SmartRouting, pays more on cash, and delivers those industry-low margin rates. For anyone trading size, carrying margin, or holding real cash, Pro’s fees are usually more than offset — IBKR’s own math puts the cash-rate edge alone at roughly $500/year on a $50,000 balance. The trap is assuming “free” (Lite) is cheaper. For an active trader it often isn’t. Fidelity, by contrast, gives you its clean-execution, money-market-core setup by default, no tier decision required.

Cost: IBKR wins the mechanics, Fidelity wins the defaults

On paper IBKR is the cheaper machine. Its 4.9 fee score tops Fidelity’s 4.8, driven by the lowest margin rates available and the most competitive base pricing on our list. For a margin user or a high-volume trader, nothing here beats IBKR Pro.

But Fidelity wins the costs you don’t have to think about. Its ZERO index funds (FZROX, FNILX) carry a 0.00% expense ratio — and for a buy-and-hold investor, fund fees dwarf trading costs over a lifetime. Its automatic SPAXX core means idle cash earns near the short rate without a second thought (one caveat: some taxable accounts default to the lower-yielding FCASH, so confirm your core position). And its no-PFOF equity routing is on by default, not gated behind a tier.

Edge: IBKR if you actively manage cost and use margin; Fidelity if you want low all-in costs handed to you.

Platform and tools: power vs approachability

Both score 4.7 on platform, but they get there from opposite directions. IBKR’s Trader Workstation (TWS) is a professional-grade cockpit — deep order types, algorithmic routing, risk tools, and full API access for automated trading. It’s genuinely powerful and genuinely intimidating, with a real learning curve; IBKR has improved its simpler web and mobile surfaces, but the platform’s center of gravity is the serious trader.

Fidelity’s Active Trader Pro is capable — real-time streaming, conditional orders, hotkeys — but it’s pitched at decision-makers, not scalpers, and it trails TWS on the most advanced order routing. What Fidelity adds instead is best-in-class research bundled free, and a mobile app that covers the whole account rather than a stripped-down slice.

Edge: IBKR for raw capability and automation; Fidelity for research and approachability. If you want to run algos or route orders like a pro, IBKR. If you want to research a decision and place it without a manual, Fidelity.

What you can trade: IBKR’s breadth is the hard gate

This is IBKR’s standout and the clearest edge in the matchup. It covers stocks, ETFs, options, futures, forex, and bonds across 150+ markets in 30-plus countries, with fractional US and Canadian shares — earning a perfect 5.0 on assets. If you want to buy equities in three countries and multiple currencies from one account, almost nothing else comes close.

Fidelity scores 4.7 — excellent inside its lane, but the lane is narrower: stocks, ETFs, options, mutual funds (including the zero-fee index funds), and bonds, with only a limited crypto set and no futures. Its fractional shares start at $1 on any stock, which IBKR also offers. But the two absences are real: futures and international market access simply aren’t there.

Edge: IBKR, decisively, on breadth. If you trade futures or global markets, the comparison ends here.

Trust and support: Fidelity’s soft-service edge

Both are about as safe as US brokerage gets. IBKR (4.8 on trust) is SEC- and FINRA-regulated, publicly traded, founded in 1978, with SIPC coverage (up to $500,000 in securities, $250,000 cash limit) plus excess protection and famously conservative risk management. Fidelity (5.0 on trust, the only perfect category score it earns) is SEC- and FINRA-regulated, privately held, founded in 1946, administering trillions, with the same SIPC coverage plus excess-of-SIPC. As always, SIPC protects against broker failure, not market losses, and it isn’t a regulator.

Support is where they diverge. Fidelity scores 4.8 — 24/7 phone, branch locations, live chat, among the most complete stacks in the industry. IBKR scores 4.2, its weakest dimension; support has improved but historically trailed the white-glove service of Fidelity or Schwab, and the platform’s complexity generates more questions. One more wrinkle for margin traders: IBKR’s aggressive auto-liquidation will close out positions faster than most brokers if you breach margin.

Edge: Fidelity, clearly, on support and hand-holding.

Who should pick which

Choose Interactive Brokers if you trade on margin, want the lowest financing costs available, need futures, forex, or direct access to international exchanges, or you optimize execution at scale. Pick Pro, not Lite, if you trade meaningful size or hold real cash — and budget time to learn Trader Workstation. This is the professional’s broker, and for an active, global, or cost-obsessed trader nothing on our list delivers more per dollar.

Choose Fidelity if you’re a US-focused long-term investor: retirement accounts, index funds, dividend reinvestment, and a cash balance you’d like paid on automatically. The SPAXX core, no-PFOF equity routing, and zero-expense-ratio funds compound quietly in your favor for years, and the support and research make it the easiest place to do it right and then leave it alone. It’s our default pick for the largest group of people choosing a broker.

Consider both. These sit near the top of our stocks category, and plenty of people keep long-term holdings at Fidelity while running an active, margin, or futures account at IBKR. That split plays each broker to its strength. See how we rate for the scoring behind the 4.8 and 4.7.

Bottom line

Fidelity’s 4.8 nudges IBKR’s 4.7, but the number understates how differently they’re built. IBKR is the most capable and cost-efficient broker we track — lowest margin, 150+ markets, futures, full automation — with a learning tax and thin support attached. Fidelity is the most complete home for a long-term US investor — automatic cash yield, clean equity fills, free index funds, and service that answers the phone at 3am — inside a deliberately narrower lane. Weight margin, global reach, and futures and you lean IBKR; weight cash management, ease, and low all-in fund costs and you lean Fidelity. Neither is a mistake for the trader it’s designed around; the mistake is choosing the one that isn’t built for how you actually trade.