“No commission” means the broker, platform, or agent isn’t charging you a direct per-transaction fee to place a trade or complete a deal. It does not mean the transaction is free. In investing, commission-free brokers still earn money from your orders, your cash, and your shares in ways you don’t see on the confirmation screen. In real estate, “no commission” usually refers to who pays the agent rather than whether an agent gets paid at all, and the rules around that changed in August 2024.
What the Phrase Replaced
For years, brokerage firms charged a flat dollar amount every time you placed a trade, often somewhere in the $4.95 to $9.95 range per order. When the industry moved to commission-free trading, that specific line item disappeared. You now pay nothing directly to the broker for the act of routing your buy or sell order.
Everything else about the cost of investing stayed. The price you actually receive when your order fills, the fees embedded in the products you buy, the regulatory charges attached to certain transactions, and the tax consequences of trading more often are all still real. And because zero-commission platforms make trading feel weightless, they tend to encourage more of it, which quietly magnifies each of those costs.
How Commission-Free Brokers Make Money Anyway
Three revenue streams do most of the work.
Payment for Order Flow
When you tap “buy,” your order usually doesn’t head straight to a stock exchange. The broker routes it to a wholesale market maker, and that market maker pays the broker a small amount, often fractions of a cent per share, for the right to execute the trade. This is called payment for order flow. It’s still legal in the United States, though regulators in the European Union, Canada, and the United Kingdom have banned or are phasing out the practice.1U.S. Securities and Exchange Commission. How Does Payment for Order Flow Influence Markets
Brokers have to disclose these routing relationships under SEC Rule 606 of Regulation NMS, which requires quarterly reports showing where customer orders went and what the broker received.2U.S. Securities and Exchange Commission. Responses to Frequently Asked Questions Concerning Rule 606 of Regulation NMS You can request your broker’s report and see exactly which market makers are filling your orders.
Interest on Your Uninvested Cash
Any cash sitting in your account that isn’t invested earns interest for the broker. Most firms automatically sweep uninvested balances into interest-bearing accounts or money market funds and keep a portion of the yield. When interest rates are high and customer balances are large, this can be a firm’s single biggest revenue source. Some brokers offer paid subscription tiers, often around $5 per month, that share a higher rate with you, but the default sweep rate is typically well below what you could earn on your own.
Securities Lending
If you hold stocks in a margin account, your broker can lend those shares to other traders, usually short-sellers, and collect a daily fee. Some firms also run fully paid lending programs that lend shares held in cash accounts, though the SEC has warned brokers to make sure these programs comply with customer protection rules.3U.S. Securities and Exchange Commission. Staff Statement on Fully Paid Lending You may get a small cut of the lending revenue. The broker keeps most of it.
The Bid-Ask Spread Is the Real Cost
Every security has two prices at any moment: the bid, what buyers are willing to pay, and the ask, what sellers will accept. The gap between them is the spread, and you pay it every time you trade, whether or not there’s a commission attached.
When your order is routed to a market maker through payment for order flow, the execution price can differ slightly from the best price available on a public exchange. You might buy a fraction of a cent above the midpoint, or sell a fraction below it. On a single trade in a heavily traded stock, that’s nothing. Across hundreds of trades in a year, it adds up. Under Rule 605, market centers and brokers publish monthly execution quality statistics, including price improvement data, so different brokers can be compared.4Federal Register. Disclosure of Order Execution Information
Spreads get much wider on less liquid investments. Thinly traded stocks, options, and cryptocurrencies on commission-free platforms can carry spreads of 1% or more, which is far more than a traditional per-trade commission ever cost.
Fees You Still Pay on a Commission-Free Platform
A handful of charges show up regardless of what the marketing says.
- SEC Section 31 fee. This government-mandated charge funds SEC oversight of the securities markets and applies to sell orders. Through April 3, 2026, the rate is $0.00 per million dollars of covered sales. Starting April 4, 2026, it rises to $20.60 per million. The SEC imposes it on self-regulatory organizations, not individual investors, but brokers routinely pass it through.5U.S. Securities and Exchange Commission. Section 31 Transaction Fee Rate Advisory for Fiscal Year 20266U.S. Securities and Exchange Commission. Section 31 Fees – Basic Information for Firms
- FINRA Trading Activity Fee. FINRA charges member firms $0.000195 per share sold, capped at $9.79 per trade, and $0.00329 per options contract. Brokers typically pass this along.7FINRA. Fee Adjustment Schedule
- Wire transfer fees, generally $15 to $30 for outgoing wires.
- Full account transfer fees through the Automated Customer Account Transfer Service (ACATS), often $50 to $125 charged by the sending firm.
- Paper statement, inactivity, and low-balance fees at some brokers.
Costs Baked Into the Investments Themselves
A trade can be commission-free while the thing you bought carries its own ongoing fees. Mutual funds are the classic example.
Many mutual funds charge 12b-1 fees, annual charges deducted from fund assets to cover marketing, distribution, and shareholder servicing. These are capped at 1% of assets per year, with no more than 0.75% for distribution and 0.25% for servicing.8Investor.gov. Mutual Fund and ETF Fees and Expenses – Investor Bulletin A fund labeled “no-load,” meaning no upfront sales charge, can still carry 12b-1 fees and other annual operating expenses. ETFs typically don’t charge 12b-1 fees, which is one reason they’ve become popular on commission-free platforms.
Mutual funds may also charge redemption fees if you sell within a short holding period, often 30 to 90 days, and some carry back-end sales loads (contingent deferred sales charges) that apply when you sell within a specified number of years.8Investor.gov. Mutual Fund and ETF Fees and Expenses – Investor Bulletin The prospectus fee table lists all of these. Read it before you buy.
Tax Traps That Commission-Free Trading Makes Easier
Frictionless trading is friendly to tax mistakes.
The wash sale rule is the big one. If you sell a security at a loss and buy the same or a substantially identical security within 30 days before or after the sale, the IRS disallows the loss for that tax year. The 61-day window covers all your accounts, including IRAs and your spouse’s accounts. On a platform that makes selling and rebuying a stock effortless, wash sale violations are easy to trigger. The disallowed loss isn’t destroyed; it’s added to the cost basis of the replacement shares, so you’ll benefit when you eventually sell those. But you lose the current-year deduction.
Fractional shares create a smaller but sharper trap. Commission-free platforms made fractional investing popular, letting you buy a slice of an expensive stock for a few dollars. Those slices generally can’t be transferred between brokerages through ACATS. When you move your account, the sending broker liquidates the fractional positions and sends cash instead.9U.S. Securities and Exchange Commission. No-Action Letter – Financial Information Forum That forced sale is a taxable event you didn’t plan for.
“No Commission” in Real Estate Is a Different Question
The same phrase shows up in home sales, and it means something else. Real estate commissions are negotiated percentages of the sale price paid to the agents in the transaction, and the rules around who pays whom changed materially in 2024.
The Traditional Structure
For decades, the seller paid a total commission of roughly 5% to 6% of the sale price, split between the listing agent and the buyer’s agent. A buyer’s agent could tell a client the service was “no commission to you” because the seller’s side covered the cost. Recent data shows total commissions averaging around 5.4%, with each agent typically receiving 2.5% to 3%.
Flat-Fee Listings
Some brokerages will list a property on the Multiple Listing Service (MLS) for a flat fee, often a few thousand dollars, rather than a percentage. These are limited-service arrangements. You get the MLS listing, but pricing guidance, negotiation help, showing coordination, and transaction management are usually excluded or offered as paid add-ons. The seller signs an agreement that spells out exactly what the broker will and won’t do.
What the August 2024 NAR Settlement Changed
Starting August 17, 2024, new rules from the National Association of Realtors settlement changed how buyer agent commissions work. Offers of compensation between agents are no longer permitted on MLS platforms, so buyers can’t assume a seller will cover their agent’s fee.10National Association of REALTORS. What the NAR Settlement Means for Home Buyers and Sellers
Any agent working with a buyer must now sign a written agreement before touring homes together, including live virtual tours. That agreement has to state a specific, objective compensation amount (a dollar figure, flat fee, percentage, or hourly rate) and can’t be open-ended. It must also disclose in plain language that commissions are fully negotiable and not set by law.11National Association of REALTORS. Written Buyer Agreements 101 Sellers can still offer concessions to buyers through the MLS, such as contributing toward closing costs, but they can’t offer direct compensation to the buyer’s agent on the MLS.
The practical result: “no commission” on the buyer’s side is harder to promise. Buyers now negotiate the agent fee upfront and may be responsible for paying it themselves if the seller doesn’t agree to cover it in the deal.