What Is Day Trading?

Day trading is the practice of opening and closing all positions within a single trading day. No trades are held overnight, so the day trader avoids overnight gaps — but must capture enough intraday movement to overcome costs and earn a living from very short timeframes.

Feature	Day trading
Hold time	Minutes to hours; never overnight
Timeframe	1-minute to 15-minute charts
Trades per day	Often 2–20
Profit per trade	Small (0.1%–1% moves)
Screen time	Full trading session
Overnight risk	None

Common setups

Momentum / breakouts — Buy strength, sell weakness; exit when momentum fades.
Mean reversion — Fade extreme moves back to VWAP or moving averages.
Opening Range Breakout (ORB) — Trade the breakout of the first 15–30 minutes' range.
News / catalyst trading — React to earnings, economic releases, breaking headlines.
Pairs / spread trading — Long one instrument, short a correlated one.

The pattern day trader rule (U.S.)

FINRA defines a Pattern Day Trader (PDT) as anyone who executes 4+ day trades in 5 business days (if day trades exceed 6% of total activity). PDTs must maintain $25,000 minimum equity in a margin account. Below $25k, day trading is restricted until restored. Rules vary outside the U.S.

Worked example

A day trader focuses on S&P 500 E-mini futures at the New York open:

09:30 — Buy 1 ES contract at 5,400; stop 5,395; target 5,412. → +12 points × $50 = +$600.
10:30 — Loss of 5 points = −$250.
11:00 — +7 points = +$350.

Net: +$700 across three trades. Good days look like this; bad days can wipe out a week.

Pros and cons

Pros	Cons
No overnight risk	High cost drag
Fast feedback	Full-time focus required
Capital efficiency	Psychologically demanding
Compounding small wins	Crowded with pros and algos

Required tools

Direct-access broker — Fast execution, low commissions, level 2 data.
Real-time data feed — Delayed quotes are unusable.
Hotkeys — Speed matters; mouse-clicking is too slow.
Reliable internet + backup — Outage = unrecoverable losses.
A trading plan — And the discipline to follow it.

Risk rules

Risk a fixed % per trade — 0.5%–1% max.
Hard daily loss limit — stop after 2–3 losses or −2%.
No revenge trading.
Trade liquid instruments only.
Avoid the open's first 1–2 minutes — maximum chaos, worst fills.

Common mistakes

Undercapitalization. Too little capital amplifies fees and forces over-leverage.
No plan. "I'll see what happens" is not a strategy.
Overtrading. More trades ≠ more profit.
Ignoring costs. A strategy that "profits" $0.50 before fees loses after.

Bottom line

Day trading is a profession, not a hobby. It demands capital, time, technology, discipline, and acceptance that most beginners don't become consistently profitable. Treat it like learning any skilled trade: paper-trade first, start tiny, journal relentlessly, and scale only with a documented edge over hundreds of trades. The upside is real — and so is the cost of getting it wrong.