The Pattern Day Trader (PDT) rule limits accounts under $25,000 to three day trades in any rolling five-business-day window. For a 0DTE scalper — whose entire style is same-day in-and-out — this is a hard, defining constraint on a small account, and you have to plan around it.
How the rule works
A “day trade” is opening and closing the same position on the same day. Do that four times in five business days on a margin account under $25K and you're flagged PDT, which typically locks the account until you deposit up to the minimum. (This is general information, not legal or tax advice — confirm specifics with your broker.) Cash accounts avoid the PDT count but introduce settlement constraints instead — a different limit, not an escape. Either way, a small account can't scalp freely.
Trading within three trades
Three day trades a week forces selectivity, which is actually a gift in disguise: you can only take your very best setups, so marginal trades self-eliminate. Plan your week as a budget — don't spend a day trade on a mediocre setup Monday morning and sit sidelined for your A+ setup Thursday. Pair this with a strict pre-trade checklist so each of your three slots goes to a genuinely high-conviction trade.
Three trades a week sounds crippling. It's really a forced-selectivity filter — and forced selectivity is exactly what most overtrading small accounts need.
The path past it
The clean solution is crossing $25K, which removes the cap — a real milestone in building an account. Until then, respect the rule, trade fewer and better, and use the constraint to build discipline you'll keep even after it lifts. NoVo tracks your positions and boundaries; you manage your day-trade budget as part of the plan.