Brokers and Accounts

What a Broker Actually Does

You cannot walk into the stock market and start buying shares. All retail trading happens through a broker, a firm that acts as your intermediary to the exchanges. When you place a buy order, your broker receives it, routes it to the appropriate market or exchange, and reports back the fill. Without a broker, you have no access.

This relationship is worth understanding, not just accepting. Your broker makes decisions that affect your execution quality, the markets you can reach, and what your trades actually cost, even when commissions are zero.

Types of Brokers

Full-service brokers provide personalized investment advice along with execution. They assign you a human advisor who manages your portfolio and recommends trades. The tradeoff is cost: commissions and fees are significantly higher, and the model is built for long-term investors rather than active traders.

Discount brokers execute trades without providing advice. Platforms like Fidelity, Schwab, and E*TRADE fall here. They offer research tools, screeners, and educational content, but the decisions are yours. Commissions have dropped to zero at most discount brokers for U.S. equities and ETFs.

Online brokers focused on active trading, platforms like Interactive Brokers, tastytrade, or Webull, go further, offering direct market access, advanced order routing, options analytics, and lower margin rates. The interface is more complex, but so are the capabilities.

The relevant question isn’t “which broker is cheapest” but “which broker gives me the tools and market access I need for how I plan to trade.”

Account Types

Cash account: You trade using only deposited funds. You cannot borrow against positions. Settlement takes two business days (T+2) for equities, which means funds from a sale aren’t fully available for two days. Cash accounts are simple and carry no risk of a margin call.

Margin account: Your broker extends you credit, typically up to 2:1 on equity securities, and sometimes higher on futures or forex. Margin amplifies gains and losses equally. It also introduces the margin call: if your account value drops below the required maintenance level, the broker can force-liquidate your positions with no warning. Margin accounts also enable short selling.

IRA accounts (Traditional and Roth) are tax-advantaged retirement accounts that can hold equities, ETFs, and options with restrictions. Roth IRAs allow post-tax contributions to grow tax-free. Traditional IRAs offer tax-deferred growth. Both have annual contribution limits and withdrawal rules. Day trading inside an IRA is possible but limited by settlement rules since margin isn’t available in the same form.

Joint accounts are held by two or more people. Individual accounts are held by one. The distinction is mostly legal and estate-planning relevant.

Regulatory Protections

The SIPC (Securities Investor Protection Corporation) covers brokerage accounts up to $500,000 (including $250,000 in cash) if the broker fails. This is not insurance against losses: if your stocks go to zero, SIPC doesn’t cover that. It protects you if the broker itself becomes insolvent and your assets disappear.

FDIC insurance applies to bank deposits, not brokerage accounts. Some brokers sweep uninvested cash into FDIC-insured bank accounts, which does get FDIC protection up to $250,000. The distinction matters: cash sitting in a brokerage account versus cash swept into an affiliated bank account has different protections.

What “Free Trades” Actually Means

Commission-free trading is real, but the broker still makes money. The primary mechanism is payment for order flow (PFOF): your broker sells your order to a market maker rather than routing it directly to an exchange. The market maker executes your trade, and in exchange, pays the broker for the privilege of being your counterparty.

The market maker profits from the bid-ask spread. In theory, they can also offer “price improvement,” executing your order better than the displayed quote. In practice, the question is whether you’d have gotten an even better fill on a lit exchange. PFOF is controversial precisely because it creates a conflict of interest: the broker is incentivized to route to whoever pays most, not whoever fills best.

This doesn’t mean zero-commission brokers are a bad deal for most retail traders. For small orders in liquid stocks, the difference is usually fractions of a cent per share. But for large orders or less-liquid names, it’s worth understanding why “free” isn’t actually free.

What to Evaluate When Choosing

The factors that actually matter vary by trading style. For active traders, consider: platform reliability during volatile conditions, order routing transparency, available order types, margin rates, and short-sale availability. For options traders: contract fees, platform analytics, and the quality of the options chain display. For long-term investors: fund selection, research tools, and account minimums.

Customer service matters more than it sounds. When you have an urgent problem with an open position, the difference between a 30-second call and a 45-minute chat queue is significant.

Practical Implications

Open a cash account first. You can’t get a margin call in a cash account, and learning the mechanics of order routing, settlement, and position management in a lower-stakes structure is valuable before adding leverage.

Understand your broker’s order routing practices before you need to. Most publish order execution statistics quarterly: dry reading, but they tell you where your orders actually go.

Common Misconceptions

“Zero commission means zero cost.” Spreads, PFOF, and margin interest are all forms of cost. Commission is the most visible cost, not the only one.

“A margin account means I have to use margin.” Opening a margin account doesn’t obligate you to borrow. It just gives you the option, along with the ability to short sell and avoid some settlement restrictions.

“SIPC protects me from losing money.” SIPC only covers broker insolvency, not investment losses. It’s more like a guarantor that your assets exist at the broker, not a guarantee they’ll have value.

Key Takeaways

• Brokers are your access point to markets: they route your orders and hold your assets.
• Account types (cash vs. margin, individual vs. IRA) determine what you can trade and at what risk.
• SIPC protects against broker failure, not market losses; FDIC applies to swept bank cash, not brokerage assets directly.
• “Free” commissions are offset by payment for order flow: understand the trade-off.
• Choose a broker based on the tools, markets, and order routing your strategy actually requires.