If you go home flat every day and short hard-to-borrow names, Lightspeed is built for exactly that job. If you ever hold margin overnight, Interactive Brokers is dramatically cheaper, and it charges nothing for its platforms while Lightspeed’s flagship runs up to $130 a month.
Choose Lightspeed if: you trade US stocks and options at serious volume, you want to shop short locates across multiple providers, or you want DAS Trader Pro or Sterling Trader Pro cleared through one broker.
Choose Interactive Brokers if: you carry positions overnight on margin, you want zero platform fees and no account minimum, or you trade anything beyond US equities and options. Day traders should compare against IBKR Pro specifically. IBKR’s own disclosure states that Lite’s commission-free orders route to select market makers under payment for order flow, while Pro orders use IB SmartRouting. For execution-sensitive trading, Pro is the relevant plan, and it’s the one this page compares.
Both brokers sit on the direct-access side of the direct access versus retail divide, and both publish full fee schedules instead of hiding costs in spreads. The differences are real, but they’re differences of structure, not of seriousness. Part of our full broker rankings.
Side by side
| Lightspeed | Interactive Brokers (Pro) | |
|---|---|---|
| US stocks, per share | $0.0035 base, down to $0.0010 over 6M shares/mo ($0.25 trade min) | $0.0035 base, down to $0.0005 over 100M shares/mo ($0.35 order min) |
| Per-trade option | $3.99, down to $2.00 over 3,000 trades/mo | Fixed plan: $0.005/share, $1.00 min, 1% of trade value cap |
| Options, per contract | $0.50, down to $0.20 over 50,000 contracts/mo | $0.65, down to $0.15 at 100,000+ contracts/mo ($1.00 order min) |
| Margin rate (USD, ~$50k debit) | 9.75% | 5.12% |
| Platform fees | $0 (Web & Mobile) to $375/mo (Eze EMS); flagship Trader Pro up to $130/mo, rebates available | None |
| Account minimum | $2,500 (Trader Pro, Web & Mobile) to $50,000 (DAS Trader Pro) | None |
| Short locates | Multiple locate sources, price shopping built in | Short Securities Availability search, published borrow costs |
| Demo or trial | Per-platform demo by request | Free trial with paper trading |
| Our rating | 4.0 | 4.3 |
Ratings follow our methodology. Pricing verified against the official schedules at lightspeed.com and interactivebrokers.com in June 2026.
Commissions and all-in monthly cost
The headline per-share rates are identical: $0.0035 at both shops for an ordinary month. The split is in how the discounts work.
IBKR Pro’s tiered schedule applies automatically and marginally. Print 1.2 million shares in a month and you pay $0.0035 on the first 300,000 and $0.0020 on the next 900,000: $2,850, no phone call required. Lightspeed’s published rate for that volume band is better at $0.0020 flat, about $2,400, but Lightspeed’s pricing page is explicit that active trader rates are not automatically applied. You have to request the rate, rebates are not issued for past activity, and rates can be raised if you stop hitting the threshold. Forget to make the call and that same month runs $4,200 at the default rate. The protection play is simple: request your volume tier in writing the first month you qualify, and re-confirm it whenever your volume steps up.
Lightspeed’s per-trade plan is the wrinkle IBKR doesn’t really match. A scalper firing 3,000+ trades a month pays a flat $2.00 a trade regardless of share size, which beats per-share math the moment your average ticket clears about 600 shares. On options, Lightspeed’s $0.50 base undercuts IBKR’s $0.65, though IBKR’s tiers fall further at extreme volume.
Two structural costs sit on the Lightspeed side of the ledger. Accounts under $15,000 in equity pay a $25 monthly minimum commission (less any commissions actually charged), and Lightspeed Trader Pro carries a software fee of up to $130 a month, with rebates available. Per-share pricing is also not available on Lightspeed Web & Mobile, per the official fee schedule. IBKR’s commission pages state there are no platform fees, ticket charges, or account minimums on either plan. Routing, exchange, and regulatory fees are billed separately at both brokers, so neither headline rate is the whole bill.
Winner: Interactive Brokers, on structure. The rates are close; the difference is that IBKR’s discounts happen to you automatically while Lightspeed’s have to be requested and defended.
Margin rates: the biggest gap on the page
This is where the comparison stops being close. Per the schedules published on both sites in June 2026, a USD margin loan at Interactive Brokers Pro costs 5.12% on the first $100,000 and 4.62% on the next $900,000, blended across tiers. The same loan at Lightspeed costs 11.00% up to $49,999 and 9.75% from $50,000–$249,999.
Run the numbers on a $50,000 debit held overnight for a year: roughly $4,875 in interest at Lightspeed’s published rates against roughly $2,560 at IBKR Pro’s. That’s a $2,315 annual gap, about $193 a month, for the identical loan.
The mitigating fact, stated plainly on Lightspeed’s margin page: there is no margin interest charge for day trades opened and closed in the same session. Interest applies only to overnight holdings in excess of your account balance. A true intraday trader who goes home flat may never pay Lightspeed a dollar of margin interest, in which case this entire section is academic. The moment you start swinging positions overnight, it isn’t. For how intraday buying power itself is now regulated, see our explainer on intraday margin requirements.
Winner: Interactive Brokers, and it’s not close for anyone holding overnight.
Platforms and execution tools
Lightspeed is an execution specialist, and its platform menu reads like one. The flagship, Lightspeed Trader Pro, is a Windows desktop platform with hotkey order entry, customizable routes to market makers, exchanges, algos, and dark pools, basket orders, Level 2, the Lightscan market scanner, an integrated AI chat for scanning and fundamentals, and 24/5 access to US equities. Lightspeed states the platform infrastructure is hosted in data centers near major exchanges. Beyond the flagship, the same brokerage account can run Sterling Trader Pro ($240–$270 a month, $25,000 minimum), Eze EMS ($375 a month, $25,000 minimum), or DAS Trader Pro ($150 a month, $50,000 minimum), per the official platform comparison table. If your workflow is already built around DAS or Sterling, getting it through one clearing relationship is a genuine convenience.
One thing to flag before you fund: Lightspeed currently publishes a $2,500 minimum for Lightspeed Trader Pro on its platform comparison page and $5,000 on the Trader Pro product page. Budget for the higher figure and confirm with the new accounts desk in writing.
Interactive Brokers attacks the same problem from breadth. Trader Workstation is the advanced desktop platform, with IBKR Desktop as the streamlined newer option, plus Client Portal on the web, IBKR Mobile, and a full API stack (REST, Python, FIX) for automation. Every one of them is free, there’s no account minimum, and a paper trading account is available before you fund anything. TWS carries bracket orders, advanced algos, scanners, and SmartRouting across exchanges and dark pools.
Winner: split, honestly earned. Lightspeed wins for the trader who wants a dedicated US-equities execution cockpit and route control, or who specifically wants DAS or Sterling. Interactive Brokers wins on cost (zero software fees), automation, and the fact that you can test the whole stack in sim before committing capital.
Short selling and locates
Lightspeed’s pitch to short sellers is specific and verifiable on its own pages: multiple locate sources, the ability to shop pricing on locates across providers, and an inventory built for the job. For traders working hard-to-borrow, low-float names, shopping the locate is real money. Paying up for a bad locate on a thin stock can erase the edge before the first fill.
Interactive Brokers approaches borrow differently: a Short Securities Availability tool for searching real-time availability and a published short sale cost framework, so you can see what the borrow runs before you commit. It’s a transparency-first model rather than a shopping-cart model.
Winner: Lightspeed for the dedicated HTB short seller; the multi-provider locate workflow is the feature that crowd actually uses. IBKR is entirely workable for shorting liquid names where availability isn’t the fight.
Minimums, account fees, and the fine print
Interactive Brokers requires no minimum deposit on either plan, charges no inactivity fees on Lite, and its commission pages state there are no platform fees or account minimums, full stop. Lightspeed’s minimums run from $2,500 (Trader Pro, Web & Mobile) to $30,000 (Connect API) to $50,000 (DAS Trader Pro), and the $25 monthly minimum commission applies to accounts under $15,000 in equity. On the way out, Lightspeed charges $95 for an outbound full account transfer and $20 for a domestic wire, per its brokerage fee schedule.
None of this is scandalous. Platform minimums and monthly minimums are normal for direct-access brokers, and Lightspeed publishes every line of it. But the practical reading is blunt: under about $15,000, Lightspeed’s fee structure is working against you, while IBKR costs nothing to sit in.
Winner: Interactive Brokers, especially for accounts under $25,000.
The verdict depends on your overnight book
There is no universal winner here, and anyone who declares one isn’t doing the math. Lightspeed is the better fit for a specific trader: high-volume US stocks and options, flat by the close, shorting names where locates are the battle, possibly running DAS or Sterling. For that trader, the margin-rate gap never bites, the per-trade plan can beat per-share pricing outright, and the locate shopping is the feature that matters.
Interactive Brokers Pro is the better fit for almost everyone else: anyone holding overnight margin (a roughly $2,300 annual difference on a $50,000 debit), anyone who wants discounts applied automatically instead of by request, anyone under $15,000 who’d rather not pay a monthly minimum, and anyone trading futures, global markets, or running automated strategies through an API at no platform cost. The two firms even overlap commercially: Lightspeed offers its Connect API through an introducing-broker arrangement at IBKR, which tells you how the industry itself sees the pairing.
Whichever you pick, the broker is the smaller variable. Most day traders lose money, and a 4.6-point margin spread won’t save a strategy that doesn’t work. Read the full breakdowns before funding: our Lightspeed review and our Interactive Brokers review go deeper on routing, data costs, and who each one is wrong for.
FAQ
Which is cheaper for day trading US stocks?
At ordinary volume they’re tied at $0.0035 per share. Interactive Brokers gets cheaper automatically as volume grows and charges nothing for platforms; Lightspeed can beat it with the $2.00 per-trade rate above 3,000 trades a month, but its volume discounts must be requested and its flagship platform fee runs up to $130 a month before rebates.
What are the account minimums?
Interactive Brokers has none on either plan. Lightspeed’s depend on the platform: $2,500 for Lightspeed Trader Pro and Web & Mobile per its comparison page (the Trader Pro product page lists $5,000, so confirm before funding), $25,000 for Sterling Trader Pro and Eze EMS, $30,000 for Connect API, and $50,000 for DAS Trader Pro.
Which is better for short selling?
Lightspeed for hard-to-borrow names: it offers multiple locate sources and lets you shop locate pricing across providers. Interactive Brokers publishes real-time short availability and borrow costs through its Short Securities Availability tool, which works well for shorting liquid names.
Should a day trader use IBKR Lite or IBKR Pro?
Pro. Interactive Brokers’ own disclosure states that Lite’s commission-free orders are routed to select market makers in exchange for payment for order flow, while Pro accounts get SmartRouting across exchanges and dark pools. For execution-sensitive intraday trading, Pro is the plan that competes with Lightspeed.
Can you test either platform before funding?
Yes. Interactive Brokers offers a free trial with paper trading across its platforms. Lightspeed offers demo access by request for Lightspeed Trader Pro, Web & Mobile, Sterling Trader Pro, and its other platforms.