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The Commission-Free Era: What Changed and Why

For most of Wall Street's history, retail investors paid a flat commission on every trade — often $5 to $10 or more per order. That changed in October 2019 when several major U.S. brokerages simultaneously dropped stock and ETF commissions to zero. The cascade began with discount brokers competing for market share, and within days the standard commission for listed stocks at most retail platforms effectively went to zero.

For high-frequency traders, this was transformative. At $7 per trade and 20 trades per month, an active trader previously paid $1,680 per year in commissions alone — money that now stays in the account. For occasional investors, the dollar savings were smaller but the psychological impact was significant: zero commissions removed a friction barrier and made small, incremental investing practical in a way it never had been before.

Options commissions have followed a similar downward trajectory, though a per-contract fee — typically $0.65 at most large brokers — has persisted at many platforms. Some newer entrants have moved to fully zero-commission options as well, creating meaningful differences between platforms for active options traders. The contrast between zero and $0.65 per contract may seem trivial on one trade, but across hundreds of contracts annually it becomes a measurable line item.

Payment for Order Flow: How Zero-Commission Brokers Generate Revenue

The elimination of visible commissions raised a logical question: if brokers charge nothing to trade, how do they remain profitable? The primary answer for most U.S. retail brokers is a practice called payment for order flow (PFOF). Under this arrangement, the broker routes customer orders not directly to an exchange but to a market maker or wholesaler — such as Citadel Securities or Virtu Financial — which pays the broker a small fee for the privilege of executing those orders.

The market maker profits by capturing the spread between the bid and ask price on each transaction. In return, the broker receives a per-share or per-contract payment. Brokers and regulators argue that this arrangement can still result in "price improvement" for retail customers — execution at prices better than the displayed national best bid and offer. Critics contend that the practice creates a conflict of interest between what is best for the broker and what is best for the customer.

PFOF is permitted in the United States and is disclosed in broker quarterly reports (SEC Rule 606). It is banned in several other jurisdictions, including the United Kingdom and Canada. The practice has been the subject of ongoing regulatory scrutiny, and proposals to restrict or reform it have periodically emerged from the SEC.

Other revenue sources for commission-free brokers include interest on uninvested cash balances, margin lending (charging borrowers a rate above the broker's cost of funds), securities lending (lending customer shares to short sellers), and subscription or premium tiers that offer additional features. Understanding this revenue mix helps investors evaluate what they are actually exchanging for a zero-dollar commission.

What to Look Beyond Fees When Evaluating a Broker

Commission costs are only one dimension of the total cost of trading. Investors who rely solely on a fee comparison may overlook factors that carry equal or greater financial weight over time.

Margin rates

Brokers vary substantially in the interest rates they charge on margin balances. A trader who frequently borrows on margin to amplify positions will pay ongoing interest regardless of whether stock commissions are zero. The difference between a 6% and a 13% margin rate on a $50,000 debit balance is $3,500 per year — far exceeding what most investors would ever pay in commissions at standard rates.

Platform and research quality

Execution quality, charting tools, screeners, real-time data, and access to third-party research differ widely across brokers. A more capable platform may help an investor make more informed decisions or execute complex orders more efficiently. Conversely, an investor who only needs a simple buy-and-hold account may have no need for advanced analytics.

Cash sweep interest

Uninvested cash in a brokerage account earns interest at a rate set by each broker. In higher interest-rate environments, the difference between a broker that pays 0.01% on idle cash and one that pays 4% or more can be material for investors who maintain significant cash positions between trades.

Order execution quality

The price at which an order is filled matters alongside the commission paid. A broker that delivers consistent price improvement — filling orders at better than the quoted price — can provide value that partially or fully offsets any per-trade fees charged elsewhere. Execution quality statistics are available in each broker's SEC Rule 605 and 606 disclosures.

Account security, SIPC coverage, customer service responsiveness, product availability (international markets, futures, bonds, crypto), and educational resources are additional considerations that affect the long-term value of a brokerage relationship. Fees are a useful starting point for comparison, but the decision involves a broader set of trade-offs unique to each investor's situation.

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