How Do Stock Brokers Make Money?
Stock brokers make money primarily by charging fees for executing trades, earning on the spread between buy and sell prices, and receiving payments for routing orders. Understanding these revenue streams helps investors evaluate the true cost of a brokerage account.
More from this site
Keep reading the latest coverage
Commission-Based Earnings
The traditional model charges a fixed fee or a percentage of the trade value each time a client buys or sells a security. While many online brokers have eliminated per-trade commissions for stocks and ETFs, they still generate revenue from options trading, mutual fund transactions, and margin lending.
The Bid-Ask Spread
Brokers profit from the difference between the price at which they are willing to buy a stock (bid) and the price at which they are willing to sell it (ask). This spread, often just a fraction of a cent, accumulates across millions of trades and represents a core revenue source for market makers and full-service brokers alike.
Payment for Order Flow
In the retail brokerage industry, firms frequently sell their customers' orders to high-frequency trading firms. These market makers execute the trades and pay the broker a small fee per share. This practice, called payment for order flow, allows many discount brokers to offer commission-free trading.
Other Revenue Sources
Beyond trading activity, brokers earn from interest on uninvested cash held in client accounts, fees for margin loans, and charges for premium research tools or advisory services. Some brokers also profit from interest rate spreads on certificates of deposit and savings products linked to brokerage accounts.
Comparing Broker Revenue Models
| Model | How It Works | Best For |
|---|---|---|
| Commission per trade | Fixed fee or percentage per order | Active traders, options investors |
| Spread-based | Earning on bid-ask price difference | Market makers, FX brokers |
| Payment for order flow | Receiving fees from market makers for order flow | Retail investors seeking commission-free trades |
| Fee-based advisory | AUM percentage or flat annual fee | Long-term wealth management clients |
What This Means for Investors
The cost structure of a broker directly affects your returns. Commission-free trading does not mean zero cost; the spread and order flow arrangements can create subtle price differences. Investors should compare total execution quality, not just visible fees, when choosing a brokerage.