🏦 Choosing a broker: what actually matters

🎯 In 30 seconds: A broker is the company that holds your account and sends your orders to the market. Before anything else, confirm it is registered with the SEC, is a FINRA member, and is a SIPC member, using BrokerCheck and the SIPC member list. Then compare the costs you will actually pay (not just commissions), the quality of the prices you get, the account types and tools you need, and how easy it is to reach a human when something breaks. There is no single "best" broker. There is a best fit for how you plan to trade.

What a broker does for you

You cannot walk onto a stock exchange and buy a share yourself. Only member firms can send orders there. A broker-dealer (usually just "broker") is a company licensed to buy and sell securities for customers.

Your broker does four jobs. It holds your cash and shares in an account in your name. It takes your orders and routes them to an exchange or another trading venue. It sends you statements, trade confirmations and tax forms. And it enforces the rules, such as settlement, margin and options approval.

Some brokers do all of this themselves. Many apps are an "introducing broker" that handles the app and customer service, while a separate clearing firm holds the assets and settles the trades. Both should appear in the account agreement. You can look up both.

Step 1: confirm the broker is real and protected

This takes ten minutes and rules out most scams. Do it for any app or website before you send money.

1. Search the firm on FINRA BrokerCheck. A US broker-dealer that serves the public must be registered with the SEC and be a member of FINRA, the industry's self-regulator. BrokerCheck shows the firm's registration, how long it has existed, and its disclosures: regulatory actions, arbitration awards and customer complaints.
2. Check SIPC membership. SIPC is a nonprofit created by Congress. If a member broker fails and customer assets are missing, SIPC steps in to restore them up to $500,000 per customer, including up to $250,000 for cash.
3. Read the Form CRS. Every broker that works with retail customers must publish a short "Client Relationship Summary" that lists its services, fees and conflicts of interest in plain language. It is usually linked at the bottom of the website.
4. Match the names. The name in the app store, the website and BrokerCheck should be the same legal entity. Scam apps often copy a real firm's name with one word changed.

Know what SIPC does not do. It does not cover losses because your stocks fell. It does not cover bad advice, worthless investments you were sold, futures, forex or most crypto. It covers missing assets when a member firm fails.

Uninvested cash is often "swept" from your brokerage account into partner banks. Then it may be covered by FDIC insurance at those banks instead of SIPC. The account agreement says which.

Step 2: compare the costs you will actually pay

Most large US brokers now charge $0 commission for online trades of US stocks and ETFs. That does not make trading free. The costs moved elsewhere. Check each line below in the broker's fee schedule.

The full breakdown, with a yearly worked example, is in What trading really costs.

Step 3: execution quality, the cost you cannot see

When you place a market order, you expect to buy at the ask (the lowest price a seller wants) or sell at the bid (the highest price a buyer offers). A good execution sometimes beats that quote. This is called price improvement.

Many commission-free brokers earn money through payment for order flow (PFOF). A wholesaler, a large trading firm, pays the broker to send it customer orders. The wholesaler earns money on the spread and passes some price improvement back to you. SEC staff have noted that PFOF creates a conflict of interest: a broker could be tempted to route orders to whoever pays most, instead of whoever gives customers the best prices.

Two public reports help you compare. Under SEC Rule 606, brokers publish quarterly reports showing where they route orders and what they are paid for them. Under Rule 605, the firms that execute orders publish statistics on execution speed and price improvement. Many brokers also post their own execution quality summaries.

Worked example (hypothetical numbers). You plan 40 round trips a year (40 buys and 40 sells), 100 shares each time. Broker A gives you an average price improvement of $0.002 per share. Broker B averages $0.008 per share.

For a small account trading occasionally, $48 a year is real but not decisive. For someone trading 1,000 shares many times a day, the same gap becomes thousands of dollars. Match the weight you give execution quality to how much you will trade.

Now compare a cost many beginners skip. Suppose you borrow an average of $5,000 on margin. At a hypothetical 12% rate that costs $600 a year. At 7%, it costs $350. That $250 gap is five times larger than the execution difference above. Margin is covered in Margin explained.

Step 4: features that fit how you will trade

Make a short list of what you need before you look at any app. Features you will never use are not a reason to pick a broker.

• Account types. Does it offer what you need: a custodial account if you are under 18, a Roth IRA, a joint account? See Account types.
• Fractional shares. Useful if you have a small account and want to buy expensive stocks or ETFs. FINRA notes that fractional shares usually cannot be transferred to another broker. You would have to sell them first, which can create taxes.
• Order types. Does it support stop-limit and trailing stop orders, and good-til-canceled orders? See Order types in depth.
• Extended-hours trading. Which sessions, which order types, and which stocks.
• Options and margin. What approval levels exist and what the broker requires. Not needed to start.
• Research and charts. Real-time quotes, charting, screeners, and access to Level 2 data if you plan to trade actively.
• Paper trading. Some brokers include a simulator. This site also has a free paper portfolio.
• Tax documents. Clear Form 1099-B with cost basis, and a choice of cost basis method.

Step 5: support, security and reliability

You will not care about support until the day an order is stuck, a deposit is missing, or the app is down during a volatile open. Test this before you need it.

• Is there a phone number with a real person, and what hours is it staffed?
• Does the broker support two-factor authentication with an authenticator app, not just text messages?
• Is there a backup way to trade if the app fails, such as a website or a phone desk?
• How does it handle outages? Search the firm's name with "outage" and read what happened and how customers were treated.

Red flags that end the search

Softer warning signs are worth a second look: a long list of customer complaints on BrokerCheck, constant pressure to trade, gamified rewards for trading more, and fee schedules that are hard to find.

A simple scorecard

Compare two or three brokers side by side. Weight each line by what matters for you. A long-term investor might care most about account types and cash interest. An active trader might care most about execution quality, tools and stability.

You can also have accounts at more than one broker. Many people keep long-term investments at one firm and a small trading account at another.

Try it

Pick two brokers you have heard of. For each, find the firm on BrokerCheck, confirm SIPC membership, find its Form CRS, and fill in the scorecard above. Then find its most recent Rule 606 report and write down the top two places it routes orders. While you compare, practice trading in the site's paper portfolio so you know which features you actually use. Then read Your first trade, step by step.

Sources

• FINRA: BrokerCheck
• SIPC: What SIPC protects
• SEC Division of Economic and Risk Analysis: How does payment for order flow influence markets?
• FINRA: Investing in fractional shares