Is day trading profitable? We measured the toll every trade has to beat first

Every answer to this question is either a discouraging statistic with no source, or a course being sold to you. Both skip the part that actually decides it. Here is the part they skip. Before a day trade can be profitable it has to pay a toll: the spread, the depth you consume, and commission. That toll is measurable, we measured it, and it is the number your strategy has to beat before profitability is even a question. This guide is not a yes or a no. It is the arithmetic, with our own numbers in it, so you can work out the answer for your own trading.

1. What every trade pays before it can win

We recorded 264 US trading sessions with ten levels of order book on every quote — 35,207,932 quotes — and walked market orders against the recorded ladder. A $5,000 market buy in a $5 to $20 stock pays about 38 basis points against the mid, one way. Round trip that is roughly 0.75%. That is how far the stock has to move in your favour before you are back to even — before commission, before being right about direction. It is not one number, it depends on what you trade and how big: One way, against the mid. Double it for a round trip. Two things fall out of that table immediately. Cheap stocks are the expensive ones. A $5,000 order in a $1-5 name costs 88bp one way, more than four times the same order in a $20-200 name. The reason is arithmetic, not liquidity fashion: the minimum tick is one cent, so on a $1.50 stock a single penny of spread is already a 0.67% round trip. 32.2% of all quotes we recorded were already one cent wide, meaning they were as tight as the rules allow and could not improve. Size costs more than people expect. Going from $1,000 to $25,000 in a $1-5 name roughly triples the cost per share, because you are consuming levels behind the touch rather than trading at the displayed price.

2. The part you actually choose

The spread is the market's price. Commission is yours, and the gap is bigger than most people think. We priced 36,947 real round trips at four US brokers using each broker's published schedule on the actual date of the trade: On a $1,000 order that difference is 68.7x. Put it next to the table above: the spread on a $1,000 order in a $5-20 stock is 27bp one way, so a 24bp commission is nearly a second spread, paid for no reason. This is the cheapest improvement available to a small account, and it requires no skill. It is worth checking before anything else.

3. Why win rate is the wrong scoreboard

Here is where most people go wrong, and we have a clean measurement of it. We took one model's 2,084 trades and re-priced every one under six fill assumptions, changing nothing else — same entries, same exits, same everything. Read the two columns against each other. The edge goes from 100 to zero. The win rate moves about five points, from 64.1% to 60.3%. A strategy can keep winning the same proportion of the time while every dollar of profit disappears. Win rate is nearly blind to cost, which is why a trader can watch that number stay healthy and still bleed. **If you are judging your trading by win rate, you cannot see the thing most likely to be killing it.**

4. The arithmetic that decides the answer

Profitability is not a feeling about your setup. It is one comparison: A profitable strategy is one where average gain per trade, after costs, is greater than zero. Which means: (win rate x average win) − (loss rate x average loss) > round-trip toll The toll is the table in section 1 plus your commission from section 2. For a $5,000 order in a $5-20 stock at a commission-free broker, that is about 0.75% round trip. Every trade starts 0.75% behind. That has a blunt consequence for target size. On a 2:1 structure, moving your target from **1.5% to 3.0% moves your break-even win rate from 67% down to 50%**. The cost is fixed per round trip, so a bigger target dilutes it and a smaller target concentrates it. This is why scalping tiny moves is so much harder than it looks. It is not that small moves are unpredictable. It is that the toll does not shrink when your target does.

5. Where it is structurally hardest

Some combinations are hostile before you place a single trade. Small targets on cheap stocks. A 0.5% target is sensible on a $50 stock and arithmetically impossible on a $1.50 one, because a third of the time the quote is already one cent wide and that penny alone is a 0.67% round trip. No amount of tuning fixes arithmetic about the minimum increment. Size larger than the book. The quoted price is typically good for only about $1,155 to $5,150 depending on the price band. Beyond that you are paying worse prices for the rest of your order, and a $25,000 order could not be filled inside ten levels 28.7% of the time. The opening half hour. It has the widest spreads of the day and the thinnest book. It is also when most intraday strategies are most active. That combination is worth knowing about rather than discovering in your P&L. A per-share commission plan on small orders. Covered above. 24bp is a very large number to hand over voluntarily.

6. What would actually change the answer

If you want the honest short version of what moves a trader from the wrong side of this arithmetic to the right side, in rough order of how much they matter and how hard they are: Fix the commission plan. Free, immediate, up to 24bp per round trip on small orders. Stop trading the most expensive combinations. Cheap stocks with small targets are structurally worse, not just harder. Size to the book rather than to the account. If your order is much larger than the depth at the touch, you are choosing to pay more. Measure your own toll instead of assuming it. Compare your actual fills against the quote at decision time. Most people have never done this and are surprised by the answer. Then, and only then, worry about the entry signal. An edge that does not clear the toll is not an edge, no matter how good the backtest looked.

7. What we did not measure

We measured cost. We did not measure how many day traders make money, and we would not trust anyone who claims to have measured that without broker account data. Studies exist, they disagree, and none of them are ours, so we are not going to quote a scary percentage at you. What we can say precisely is what every trade has to overcome first, and that number is larger than most people assume and largest exactly where beginners tend to start: small accounts, cheap stocks, small targets, and the opening half hour. Everything above is measurement, not advice, and none of it is a prediction about your results.