Zero is the most expensive price in investing.
Commission-free trading trained everyone to look at the trade and nowhere else. The trade costs nothing now. Everything around the trade is where the money leaks, and that is what decides the cheapest online broker for you.
Options traders feel it first. Sixty-five cents a contract sounds like nothing. Run it on twenty contracts a week and it is over a thousand dollars a year at some brokers, while others charge half, or nothing on closing trades. The stock commission is zero everywhere, so the contract fee is doing the damage.
Then the quiet fees. Margin interest. Wire fees. Account transfer fees. Paper statement charges. None of them make the ads. All of them make your statement. I have watched people chase a $100 promo while paying $75 to move their account out and $25 per wire. Do the arithmetic before the marketing gets you.
A real brokerage fee comparison is boring and takes an hour. List your actual activity, price it at three brokers from their published fee schedules, pick the lowest total. If spreadsheets make your eyes glaze over, a fee audit calculator SaaS does the same math faster. You enter your trading habits, it estimates the annual fee load per broker.
One habit I would build: a broker fee alert app with push notifications watching for schedule changes. Nobody reads fee PDFs for fun. Let the phone do it.
And glance at payment for order flow disclosures. Not because it is sinister. Because nothing is truly free, and the brokers who explain it plainly are usually the ones worth trusting.
Want a second pair of eyes on the fee math? BrokerCompare's onboarding calls cover exactly this. Start at brokercompare.fyi.