Day trading: what it actually takes

A day trade opens and closes within the same trading day. Closing the position avoids carrying it into the next day's opening gap, when a stock opens far from its previous close, often after news. Regular US stock trading usually ends at 4:00 PM ET, but early closes and extended sessions have different hours. Set a planned exit time for the session you trade. Fast moves and trading halts can still disrupt an exit.

The account rule to know first

Starting in 2001, FINRA's pattern day trader rule said that four or more day trades inside five business days in a margin account, one that lets you borrow from your broker, required at least $25,000 in equity. FINRA replaced that rule with new intraday margin standards, effective June 4, 2026. They drop the $25,000 minimum and the day trade count. Brokers have until October 20, 2027 to switch over, so yours may still apply the old rule. Ask before you plan around it.

Cash accounts never had the rule, but money from a sale must settle before you can freely reuse it. US stock trades settle one business day after the trade, called T+1. Buying and quickly selling again with unsettled money can get a cash account restricted.

A simple structure to start with

Trade liquid names only. Stocks and ETFs that trade millions of shares a day, with a spread of a penny or two. The spread is the gap between the highest price a buyer offers and the lowest price a seller accepts. Thinly traded names fill you at bad prices on the way in and worse on the way out.

Let the first 15 minutes set the range. The high and low of the first 15 minutes after the 9:30 AM ET open are the opening range, the first levels that matter. A clean break above the high on heavy volume, meaning more shares changing hands than usual, is a long setup, a setup to buy. A break that falls back inside the range is a warning.

Choose a practice risk budget. In this hypothetical example, 0.5% of a $30,000 paper account is $150. That percentage is an exercise choice, not a rule for every trader. Say the range is $49 to $50 and you buy at $50 with a planned exit at $49. The $1 gap gives $150 divided by $1 = 150 shares, using $7,500 of practice cash. The planned loss is $150 before costs; an actual exit can be worse.

Write a daily stopping rule. For this paper exercise, stop after two losing trades or a 1.5% account loss that day, whichever happens first. Record the results without adding another trade to recover the loss. These are practice limits, not proven optimal thresholds or guaranteed maximum losses.

What to track

Win rate matters less than average win versus average loss. A 40% win rate with winners twice the size of losers comes out ahead before trading costs. Over 10 trades risking $150 each, 4 wins of $300 make $1,200 and 6 losses of $150 cost $900, a net gain of $300. A 70% win rate with one uncontrolled loss can erase a month. Track win rate alongside average wins and losses in your own journal.

Try this

For one week, paper trade only. Each morning, mark the 15-minute opening range on one heavily traded stock or ETF you follow. Write down where a break would trigger, where the stop would go, and the share count that risks $150 on a pretend $30,000 account. On Friday, total the paper results in dollars and count how many days you would have hit the loss limit.