Think zero-commission means free? The US-stock money leaves elsewhereThe fees on US-stock trading: commission, FX, platform and regulatory

01Why "zero commission" is half the story

The phrase "zero commission" did something useful: it killed the most visible fee on a stock trade, the flat charge brokers used to take just for routing your order. For a beginner that's a genuine win, and it's why so many platforms shout it on the homepage. The problem is the conclusion people draw from it, that trading US stocks is now free.

It isn't, because a business that waives the one fee you watch has to make money somewhere else. That somewhere is usually a place you don't read: a margin baked into the exchange rate, a charge at the funding step, a fraction of a cent in regulatory pass-through fees, or interest on borrowed buying power. None of these is a scandal. They're how the system pays for itself. The point of this article is simply to move them out of the blind spot, so the number you compare across brokers is the real one, not the headline.

02The seven places money leaves a trade

It helps to picture the full life of one trade and mark every gate where a fee can sit. Money enters at funding, gets converted at FX, pays commission or its replacement when you buy, brushes past tiny regulatory fees on the sell, may carry a platform or inactivity charge in the background, pays interest if any of it was borrowed, and gets nibbled once more on the way out at withdrawal.

Group them and there are really two families. The first is per-trade cost, what each buy and sell takes: commission, regulatory fees, and the FX spread if your money wasn't already in dollars. The second is holding and account cost, what time and the account itself take: platform or inactivity fees, borrow interest, and the funding/withdrawal charges that bracket the whole thing. Keep the two families separate and a fee table stops looking like noise.

03All the fees, one table first

This table is the spine of the article. Scan it for the shape of things, who charges, how big it roughly is, and whether you can avoid it, then each fee gets its own fine print below. The magnitudes are illustrative ranges to show relative size, never quoted numbers; the specifics are always whatever your broker's official fee schedule says.

One pattern stands out: the fee that's loudest, commission, is the one mostly already zero, while the fees that are quietest, the FX spread and borrow interest, are where the real money tends to go. That inversion is exactly why "free to trade" misleads, and why the rest of this piece spends its time on the quiet lines.

04Commission and what replaced it

For US-listed shares, most brokers aimed at retail now charge no per-order commission. So far so good. But two things deserve a second look. First, "no commission" usually applies to plain US stocks and ETFs, not necessarily to options, foreign listings, broker-assisted phone orders, or other products, where a per-contract or per-order fee can quietly reappear. Read which products the zero actually covers.

Second, when a service is free, ask how it's funded. A common answer is payment for order flow, where the broker is paid for routing your orders to particular market makers. You don't see a line for it, and for an occasional long-term buyer the practical effect is usually small, but it's worth knowing the "free" has a quiet revenue model behind it rather than assuming it costs the broker nothing. None of this is a reason to panic; it's a reason to keep reading past the word "zero".

05The FX spread: the biggest one you can't see

If your money isn't already in dollars, the single largest cost on a US-stock trade is often the one with no fee label at all: the exchange-rate spread. The broker or payment rail converts your currency to dollars at a rate a little worse than the mid-market reference, and that small gap, taken on the full amount, can dwarf every printed fee on the page.

There's a structural trap here too: if you convert to dollars to buy, then convert back to your currency to withdraw, you pay this spread twice on the same money, once each way. Holding a dollar balance between trades, or converting in fewer, larger batches, keeps the spread from compounding. As always, where and how your broker converts, and at what reference, is on its official page, not in a rule of thumb.

06Platform, regulatory and the tiny line items

Some costs are small enough that they don't change a decision, but you should still recognize them so an unfamiliar line on a statement doesn't alarm you. The regulatory and exchange pass-through fees on US trades fall here: a regulator or exchange sets a tiny charge, usually on sells, the broker collects it and forwards it on, and per trade it's a fraction of a cent that you'd struggle to feel. It isn't avoidable, but it also isn't material for an ordinary investor.

Platform-level charges are different in character, because they vary by broker. Some brokers levy a monthly or annual platform fee, a data or market-data subscription, or an inactivity fee if the account sits dormant past some period. Whether any of these apply to you is entirely broker-specific, which is why the fee schedule, not the marketing page, is the document to read before you commit.

07Funding, withdrawal and inactivity charges

The fees that bracket your trading, getting money in and getting it back out, belong to the account rather than to any single trade, but they're real cost all the same, and a frequent depositor or withdrawer can pay them many times over. A wire can lose a fixed amount to intermediary banks in transit; a card or third-party rail can fold its cost into the rate; the withdrawal side mirrors the funding side and adds its own spread on the way out.

The practical lever is frequency and batching. Many small deposits each pay the per-transfer cost, while one larger deposit pays it once, so the fee-per-dollar falls as the batch grows. We cover the funding routes and their trade-offs in their own guide; the point to carry here is simply that these charges are part of the total cost of holding a US-stock position, not a separate, ignorable category.

08Borrow and leverage: cost that runs on a clock

Every fee so far is charged once per event. Borrow cost is different: it runs on a clock. If you trade on margin, or use any leveraged buying power, the broker charges an annualized financing rate that accrues every day you hold the borrowed amount. A position you carry for months can quietly pay far more in interest than it ever paid in commission, and unlike a one-off fee, this one keeps growing the longer you wait.

This is the fee most able to surprise a beginner, precisely because it's invisible at the moment of the trade and only shows up as it accrues. It's also the most avoidable: a cash account that never borrows never pays it. Leverage has its uses for people who understand it, but treating borrowed buying power as if it were free is how a small fee becomes the largest line on the statement.

09Total one round trip yourself

To total a round trip honestly, add four buckets: the per-trade fees on the buy and the sell (often near zero on commission, plus the tiny regulatory line), the FX spread on any conversion in and out, the account-level fees that touched the period (platform or inactivity, if any), and any borrow interest if leverage was involved. Most beginners count only the first bucket and miss the second, which is usually the biggest. Run the numbers once, on your own real trade, and the fee structure stops being abstract.

• List the buy and sell fees from the trade confirmations, commission plus any regulatory line.
• Estimate the FX spread by comparing dollars received against the mid-market rate, on both the conversion in and out.
• Check the fee schedule for any platform, data or inactivity charge that applied during the holding period.
• If any buying power was borrowed, add the financing accrued across all the days you held it.
• Add the funding and withdrawal charges that bracketed the trade, counting each transfer once.
• Divide the total by your trade size to see the real cost as a fraction, then compare brokers on that, not on "zero commission".

10Who pays the most, and who barely notices

Mapped to behavior, roughly: the investor who pays the most is the frequent trader who converts currency on every trip, holds on margin, and moves money in and out often, because they pay the FX spread repeatedly, run the financing clock, and stack per-transfer charges. The one who barely notices is the long-term cash buyer who funds in a few large batches, holds a dollar balance between trades, never borrows, and trades infrequently, for them the headline "zero commission" is close to the truth, because the quiet fees rarely get triggered.

Most people sit between the two, and the useful takeaway isn't to fear fees, it's to know which of your habits flips the quiet ones on. Convert in fewer batches, hold dollars between trades, avoid borrowing you can't price, and read the fee schedule rather than the marketing line, and the gap between the headline and your real cost shrinks to something small. That, not chasing a literal zero, is what "trading cheaply" actually means.

11FAQ

This article is for education, not investment or tax advice; the fee magnitudes are illustrative ranges shown only to convey relative size, with specifics per each broker's and platform's official, live fee schedule. Last updated 2026-06-20. Sources: public fee schedules of major brokers and general market-structure knowledge, summarized and de-specified.