Commission-free trading sounds like a bargain. Millions of British investors have downloaded an app, seen the word free, and assumed the only money at risk was whatever the market took. The reality is that trading apps earn their keep in quieter ways, and knowing where those costs hide can save an active investor hundreds of pounds a year.
Free rarely means free
Most platforms make money on the spread, the small gap between the price you buy at and the price you sell at. On its own it looks like pennies, but it applies to every single trade in both directions. Then come the extras: currency conversion fees of 0.5 to 1.5 percent every time you buy an American share, monthly account charges, fees for withdrawing your own money, and charges for live price data. None of these appear in the adverts.
The scale of it surprises most people. According to UK trading statistics compiled from FCA data and the brokers’ own filings, the average active UK client is worth several thousand pounds a year in revenue to the major platforms. That money comes from somewhere, and it is not from the free commissions.
The same trades, very different bills
Here is the part that matters for your wallet: two people making identical trades on different apps can pay wildly different amounts. A monthly habit of buying a few US shares might cost almost nothing on one platform and £15 to £20 in conversion fees alone on another. Over a decade of investing, the difference compounds into the price of a decent holiday every year.
For anyone trading more frequently, the gap widens further. Spreads, overnight financing charges and data fees vary enormously between providers, and the platforms with the biggest advertising budgets are rarely the cheapest ones.
How to compare before you commit
The fix costs nothing but an evening. Independent reviewers now open real accounts and trade real money to test what platforms actually charge in practice. A day trading platform comparison lets you set the FCA-regulated options side by side on spreads, currency charges and account fees before a penny of your money is at stake.
Sites such as The Investors Centre fund these tests with real deposits, which matters because published fee schedules and real-world costs are not always the same thing. Their consistent finding is simple: for a given trading style, picking the right platform is worth more than most attempts to pick the right shares.
Three checks before you deposit
First, price up your own habits, not the headline offer. If you buy US shares, the currency conversion fee matters more than the commission. Second, check the withdrawal and inactivity fees, because the cheapest platform to use can be the most expensive one to leave. Third, if you are considering leveraged products, read the loss disclosure every regulated provider must publish. It tells you what percentage of that platform’s own customers lose money, and it is the most honest number in the industry.
Trading will always carry risk, and no app can change that. But paying more than you need to for the privilege is a cost entirely within your control, and it is one of the few sure wins available to any investor.