The pattern-day-trader equity floor as a leverage governor

How the pattern-day-trader label attached

A pattern-day-trader is a margin-account designation that attaches after a short burst of same-day round trips and then imposes a much higher equity-floor. The label attached after four same-day round trips inside five business days. An account with only 5000 or 10000 in equity then had to reach a 25000 floor or be held to cash-only operation.

A day-trade is buying and selling, or selling and buying, the same security on the same session inside a margin account. Specified overnight positions that are closed the next day before a new trade in that name are excluded from that count.

The equity-floor as a capital lock

The equity-floor is the minimum account equity that must be in place before designated same-day margin activity can continue. The designated-trader equity-floor was raised from 2000 to 25000. That change replaced a small minimum with a capital lock that bounded how much leverage a thin account could apply to same-day turnover.

Cash accounts sat outside the designation

Cash accounts sat outside the designation, so frequent same-day turnover remained possible only when positions were fully paid rather than financed on margin.

The restoration window and the cash-basis-restriction

Once the designation triggered, five business days were allowed to restore 25000 of equity before the book was restricted to cash-only handling. That lock is a cash-basis-restriction. It stops further margin-financed turnover until equity is restored or activity is moved to fully paid cash.

How the intraday-margin-haircut capped peak exposure

Designated day-trade margin was set at 25 percent of that day's total security cost, or 25 percent of the highest dollar amount left open during the session. That share is the intraday-margin-haircut: the part of that day's traded cost, or of the peak dollars left open, that designated day-trade activity must cover with equity. Peak exposure stayed capped by equity even if activity rose.

Keeping the day-trade count below the trigger

Traders trying to stay undesignated could halt new entries after three day-trades in five days, delay openings until the last hour to cut same-day stop-outs, and drop setups that needed tight stops when the count was already high.

Splitting cash turnover from the margin book

A cash or retirement cash book could absorb same-day turnover while the margin book was reserved for shorts. That split kept leverage from concentrating so that one account did not absorb every round trip.

When a house-overlay is the binding limit

Brokers could demand more equity than the written 25000 floor and set their own multi-account rules. A house-overlay is a broker rule that can demand more equity, or tighter multi-account handling, than the written exchange floor. The binding leverage limit was often the house-overlay rather than the exchange minimum alone.