Choosing an Online Brokerage for Active Trading

Choosing a brokerage and choosing a trading platform are different decisions, and conflating them is how people end up on software they like at a firm that cannot do what they need.

The broker determines what you are permitted to do: which assets, which order routing, whether you can get a borrow on a hard-to-locate stock, what happens to your money if the firm fails. The platform is the software you look at. You can change the software. Changing the broker means moving an account.

This page is about the first decision. If you want the software comparison, that is a separate piece.

What actually changed recently

Two things reshaped this landscape and a lot of published advice predates both.

TD Ameritrade no longer exists. Schwab completed the account migration in May 2024 and retired the brand entirely. You cannot open one. Any guide still recommending it was written before that and has not been checked since, which tells you what else in it has not been checked.

The pattern day trader rule is gone. FINRA abolished the PDT designation and the $25,000 minimum equity requirement on 4 June 2026 under Regulatory Notice 26-10, replacing them with an exposure-based framework. There is an optional broker phase-in running to 20 October 2027, so individual firms may still enforce the old rules; ask yours directly. Account size no longer decides which broker will let you trade actively, which used to be the first filter most people applied.

The questions that actually separate brokers

Can you get a locate?

If you intend to short small caps, this is the whole decision and nothing else on this page matters much. Shorting requires the broker to locate borrowable shares, and most retail-facing firms simply do not offer a meaningful borrow desk. A firm that cannot get you a locate cannot get you into the trade, whatever its commission schedule says.

This is the single most common reason a trader has to move accounts after a year, and it is entirely predictable in advance.

Is it direct access, or is your order sold?

Direct access means you choose the venue your order goes to. Payment for order flow means the broker sells your order to a wholesaler who fills it. For an investor buying a hundred shares, the difference is usually a fraction of a cent and genuinely does not matter. For someone trading actively into fast conditions, routing control is the difference between the fill you saw and the fill you got.

Be honest about which of those two you are, because commission-free brokers are genuinely the cheaper answer for the first one.

What does it cost, all in?

Headline commissions are the least interesting number. The full cost is commission plus routing and exchange fees, plus market data subscriptions, plus any platform fee, plus the margin rate if you carry a position, plus the quality of your fills, which is a real cost that never appears on a statement.

A "zero commission" broker with poor fills can be more expensive per trade than one charging a per-share rate with good routing. That crossover happens at a lower activity level than most people expect.

What protection do you actually have?

US brokers are typically members of SIPC, which protects securities up to $500,000 including a $250,000 limit for cash, if the firm fails. It is worth being precise about the scope: SIPC covers the failure of the brokerage, not losses from your trading, and not a decline in the value of what you own.

Check membership directly on the broker's own disclosures rather than taking a comparison site's word for it, and check whether the entity you are opening with is the same one that holds the assets.

Which assets, on one login?

Stocks, options and futures have different regulators, different margin treatment and often different account applications. If you expect to trade futures within the year, opening at a firm that does not offer them means a second account, a second data subscription and a second set of habits.

How do they behave on the worst day?

The measure that matters is not the interface. It is whether the platform stays up during a volatile open, whether the phone is answered when it does not, and whether the mobile app can flatten a position when the desktop is frozen.

Outage history during high-volatility sessions is public and worth an hour of searching before you fund anything. So is a funded backup account at a second firm, which is the only real answer to this problem and which every professional desk keeps.

How to choose, in order

Pick the asset class first, then the broker that serves it properly, then the software. Most people do this backwards, fall in love with an interface, and find out three months later that their broker cannot get them a borrow or that their fee tier only makes sense at volume they will never trade.

If you are shorting small caps: a direct-access broker with a genuine locate desk. Everything else is secondary, including cost.

If you are trading futures: a firm registered as an FCM, and check margin requirements and day-trade margin separately, since they differ substantially between brokers for the same contract.

If you are trading options actively: per-contract cost, whether there is a per-leg cap, and whether closing trades are charged. Multi-leg strategies make small per-contract differences compound quickly.

If you are mostly investing with occasional trades: almost any large commission-free US broker is fine, and the routing debate does not apply to you. Choose on interface and support quality.

Before you fund it

Open the account, then do the boring checks with the smallest size the firm allows. Place a bracket order and cancel it. Hit the ladder from both sides. Confirm what a partial fill looks like on screen. Find out whether the mobile app can close a position when the desktop is unresponsive.

Do this through a real open, not on a quiet afternoon. That last check has saved more money on our desk than any indicator, and it takes twenty minutes.

If you want to see how a working desk uses its brokers during a live session rather than reading about them, you can sit in with us for three trading days.