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How Much of Your Gross Profit Do Costs Take?

A month's trading shows a gross profit, before costs, of 600 dollars. Costs: spreads 150 dollars, commissions 60 dollars, swaps 30 dollars. Compute the net result and cost share.

Total costs: 150 plus 60 plus 30 is 240 dollars. Net: 600 minus 240, which is 360 dollars. The share of gross profit consumed by costs is 240 divided by 600, 40 percent.

Break it down: spreads are 62.5 percent of costs, commissions 25 percent, swaps 12.5 percent.

What do these numbers suggest? Spread is the largest piece, so choosing times and pairs with tighter spreads has the biggest effect. Commission could be compared with a standard account. Swap may reflect holding trades through multiple rollovers, which a different style might avoid.

Now consider the sensitivity. If the same activity had generated gross profit of 400, net would be 160, and costs would take 60 percent. If gross profit were 200, net would be minus 40: a losing month with a profitable trading edge before costs.

The lesson: a strategy's value is net of costs, and thin edges are fragile.

Try the experiment of reducing trade count by 25 percent, cutting the lowest-quality trades. If those trades had zero edge, costs fall by 60 dollars with no loss of gross profit, raising net to 420.

Costs are one of the few things you can control with certainty.

Exercise: break down your last month's costs into spread, commission, and swap, and compute the share.

Clear breakdown. For short-term traders the 40 percent number is not unusual, and in our team's experience it often gets higher when the strategy has a small average win. A good test is to recalculate the month with spreads 30 percent wider, since that's roughly what we see in the first minutes after major releases or in the thinner Asian hours on some crosses.

If net falls to almost zero under that scenario, the strategy is too dependent on perfect execution. Moving trades away from the widest spread periods usually helps more than trying to negotiate commission.

The sensitivity table is the key insight. Costs of 240 dollars are fixed by the trading activity, not by the results. So when gross profit falls from 600 to 400, the cost share jumps from 40 to 60 percent, and at 200 the month turns negative. A trader with a genuine edge can still lose money if their activity level generates costs that exceed what the edge produces. That's why reducing costs, or reducing the number of low quality trades, often improves results more reliably than trying to improve entries. The costs are certain, while the gross profit is not.

I did this exercise on one of my own months and the result was uncomfortable. My gross was a bit better than the example, but spreads were nearly half of my costs, and when I sorted my trades by the hour they were opened, a large part of the spread bill came from entries in the first few minutes after the top of the hour, when quotes were noticeably wider than usual on my account.

The change that helped most was not a different broker, it was dropping the trades that had the smallest targets. When a setup aims at eight pips and the spread is 1.2, about one seventh of the profit is gone before price moves, and those were exactly the trades I got least from. I stopped taking them and my trade count fell by about a fifth.

I also started recording the spread at entry in my journal as its own column. After a month I could see which pairs and which hours were worth trading, and my net result improved even though the gross barely moved.

The breakdown into spreads, commissions, and swaps shows where to look first. Spreads at 62.5 percent of costs suggest the biggest gains come from trading at times when spreads are tight, such as during the London and New York sessions, and avoiding illiquid periods like the rollover hour around 23:00 WAT in winter, when spreads often widen sharply. Choosing pairs with tighter spreads also helps. A switch from a minor pair with a 2.5 pip spread to a major with 0.8 pips cuts that cost dramatically for the same number of trades.

The experiment of cutting the lowest quality 25 percent of trades is worth taking seriously. If those trades had zero gross edge, removing them saves 60 dollars in costs and raises net profit from 360 to 420, a 17 percent improvement with no change to the strategy. If they had negative gross edge, the improvement would be even larger. The challenge is identifying them in advance. Tagging trades by setup quality at entry, and reviewing the results by tag after a month or two, usually shows which ones contribute and which ones just pay costs.

The closing line, that costs are one of the few things you can control with certainty, is a good principle. Market direction can't be controlled, and the win rate fluctuates. But the choice of broker, account type, trading times, pairs, holding period, and trade count all affect costs directly. A trader who reviews costs monthly, as suggested, and makes small adjustments, can often add a meaningful amount to net results. Has anyone here broken down their monthly costs like this? I'd be curious which component turned out to be largest and what change helped most.