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Only trading with the daily trend: what you gain and what you give up

A common bit of advice is to scalp only in the direction of the daily trend. If the daily chart is trending up, only take buys on the lower timeframes. It's a simple filter and it does remove a lot of bad trades.

What you gain is clear. You stop fighting the bigger flow, and pullback entries in the direction of the trend tend to have the higher timeframe behind them. Fewer trades, usually better ones.

What you give up is less talked about. Intraday reversals against the daily trend happen almost every day, and some of them are big. A strong London selloff in a daily uptrend is still a move you could have traded. You also lose a lot of trading in ranging periods, when the daily trend is unclear or flat and the filter tells you to sit out.

Then there's the definition problem. What counts as the daily trend? Above a moving average? Higher highs and lows? Different definitions flip at different times, and on the days they disagree, the filter is confusing.

I think the filter suits newer traders well because it removes a whole class of mistakes. Over time, some traders loosen it, for example allowing counter-trend trades only from major levels with smaller size. That's a reasonable middle ground once you've got data to support it.

A way to test whether the filter helps you specifically is to tag every trade in your journal as with or against the daily trend, using one fixed definition, and compare results after a couple of months. If your counter-trend trades are clearly worse, the filter is doing its job. If they're similar, it might be costing you trades for no benefit. A lot of people assume the answer without checking, and the result can surprise you either way. Keep the definition simple so you're not tempted to bend it after the fact.

The timeframe gap matters. Using the daily trend to filter M1 trades is a big jump. The daily might be up while the H4 has been falling for two days. Some people use an intermediate timeframe, like H4, as the filter for M5 and M15 trades, because it reacts faster and is closer to what's actually driving the session. There's no perfect pairing, but if you trade very short timeframes and the daily filter keeps you out of obvious intraday trends, trying H4 instead is a sensible experiment. The H4 flips more often, which is the point.

On days when the daily trend ends, the filter keeps you trading in the wrong direction until the daily chart changes, which can take several sessions.

Some traders use the daily trend as a size filter instead of a direction filter. Trades with the trend get full size, trades against it get half. That keeps some exposure to reversals while still favouring the trend.

Defining the daily trend is the first problem. Is it price above the 50 day moving average, a higher high and higher low on the daily chart, or just the direction of yesterday's candle? Each definition gives different answers on many days. A loose definition makes the filter meaningless. A strict one might leave you with few days where the trend is clear. I'd write down a single definition and apply it the same way every day, then test it. If the filter only works with one very specific definition, it's probably a fit to the past rather than something reliable.

The days when the daily trend is unclear might be the most important ones to look at. If your rule says only trade with the trend, what do you do when the daily chart is in a range? Some traders skip those days entirely, others trade both directions with smaller size. Depending on the market, ranging days can be a big share of all days. If you skip them, you might miss a lot of decent setups. Checking how much of your past profit came from range days before applying the filter tells you what the rule would really cost you.