Pattern day trader rule: the legacy PDT test and the 2026 replacement

For almost a quarter of a century, the pattern day trader rule was the first wall every new US day trader hit. Make four round-trip trades inside five business days in a margin account and your broker labeled you a "pattern day trader," required $25,000 in the account, and froze you if you fell short. Countless traders with small accounts organized their week around not making that fourth trade.

In 2026 that changed. FINRA, the self-regulatory body that writes margin rules for US brokers, replaced the day-trading provisions of its Rule 4210 with an intraday margin standard that took effect on June 4, 2026. There is a catch that matters to anyone trading today: firms may keep using the old rules during a phase-in that runs until October 20, 2027. So, as of October 2026, two traders at two different brokers can face two different sets of rules.

This page explains both. You'll learn how the legacy rule defined and counted day trades, what the $25,000 minimum and "four times" buying power meant, what the new intraday margin standard does instead, and how to find out which version your account is under. It describes US rules as of October 2026 and is educational, not legal advice.

What counts as a day trade

A day trade is opening and closing the same position in the same security on the same day in a margin account: buying a stock and selling it before the close, or selling it short and buying it back the same day. Options count too. A position you hold overnight is not a day trade when you close it the next morning, even if you sell it within minutes of the open.

The definition comes from FINRA Rule 4210, the margin rule that every FINRA member broker follows. Because the rule was about margin, it never applied to cash accounts, where every purchase is paid in full. The trade-off there is different: in a cash account you can only reuse money after it settles, which the page on Cash account violations: good faith, free-riding and liquidation covers in detail.

The legacy rule: how the PDT test worked

Until June 4, 2026, Rule 4210 contained a set of special requirements for customers it called pattern day traders. Many firms still run these rules during the phase-in, so it is worth knowing exactly how they worked.

The four-in-five test

You were a pattern day trader if you executed four or more day trades within five business days in a margin account. There was one small exception: if those day trades were 6% or less of your total trades over the same five days, the designation did not apply. In practice that exception rarely helped retail traders, because someone making four round trips a week rarely makes the 60-plus other trades the exception would need.

The five days rolled forward. Every morning the oldest day dropped out of the window and the new day came in, so the question was always "four or more in the last five business days," never "four this calendar week." Two day trades on a Thursday and Friday followed by two more on Monday and Tuesday were just as much a pattern as four in one week.

The $25,000 minimum

Once flagged, a pattern day trader had to hold at least $25,000 of equity in the margin account on any day they day traded. The money had to be in the account before the day trading, and it had to stay there; you could not deposit it in the afternoon to cover the morning. Equity could be cash or marginable securities.

If equity fell below $25,000, the account could not day trade until it was restored. For the $12,000 account in the example above, that meant no more day trades at all, only positions held overnight, unless the owner added $13,000.

Day-trading buying power: the "four times" limit

Pattern day traders received day-trading buying power equal to the account's maintenance margin excess at the previous day's close (equity minus the maintenance requirement on open positions) times four for equity securities. Exceed that, and the firm issued a special maintenance margin call. Until it was met, the account was margined on the full cost of every day trade made that day, buying power dropped to two times maintenance excess, and the firm could no longer use "time and tick," a method that margins only the highest open position reached as trades occur in sequence rather than the total of every purchase.

The 90-day restriction

If a special maintenance margin call was not met within five business days, the account was restricted to trading on a cash-available basis for 90 days, or until the call was met. That is the "frozen for 90 days" story many traders know.

The 2026 replacement: intraday margin

FINRA filed the change as SR-FINRA-2025-017, an amendment to Rule 4210. It was published in the Federal Register on January 14, 2026, approved by the SEC on April 14, 2026, announced in Regulatory Notice 26-10 on April 20, 2026, and took effect on June 4, 2026, 45 days after the notice.

What was removed

The amendment deleted the day-trading section of the rule in its entirety:

• the pattern-day-trader designation based on counting day trades
• the $25,000 minimum equity requirement
• day-trading buying power and its 4× and 2× multipliers

What replaced it

Instead of asking "how many day trades did you make?", the new rule asks "did your margin cushion go negative during the day?" It does this with three defined terms.

• Intraday margin level (IML). The cash you could withdraw while still meeting maintenance margin, or, if you are short of maintenance, the cash you would need to deposit (a negative number).
• IML-reducing transaction. Any purchase or sale in the margin account, an option exercise, assignment or expiration that lowers the IML, or a withdrawal of cash or securities.
• Intraday margin deficit. For any day with an IML-reducing transaction, an amount no smaller than the largest negative IML after any of those transactions.

In plain terms: each time you trade, the firm checks whether your equity still covers the margin your positions need. The worst shortfall of the day is your intraday margin deficit, even if you closed everything and ended the day flat.

Paying a deficit, and the new 90-day rule

A firm must require the deficit to be satisfied "as promptly as possible." It counts as satisfied when deposits or increases in IML on later days add up to the deficit. It stays outstanding until it is satisfied or until close of business on the 15th business day after it arose.

The 90-day restriction survives in a narrower form. It applies to a customer who has a practice of not paying deficits promptly and fails to satisfy one by close of business on the fifth business day. The firm must then stop the account from creating or increasing a short position or debit balance (other than by closing a short) for 90 calendar days, or until the deficit is paid. Small deficits, no larger than the lesser of 5% of account equity or $1,000, do not count toward that practice test, and neither do deficits from extraordinary circumstances.

How firms put it into practice

The rule does not require real-time monitoring. A firm may block orders that would create a deficit, calculate deficits once at the end of the day and issue a call, or combine the two. If a firm cannot show the order of a day's trades, the rule assumes the sequence that produces the largest deficit. Expect brokers to differ: some will reject an order that would push you negative, others will let it through and call you that evening.

What did not change

The $2,000 minimum equity to trade on margin still applies; below it you can trade the margin account only with available cash. The 25% maintenance requirement on long margin stock still applies, and FINRA's investor page says it applies "throughout the entire trading day." Firms can still set higher house requirements, and Regulation T's 50% initial margin on purchases is untouched. Those rules are explained in Cash vs margin accounts: differences, rules and which fits you and Buying on margin: how margin loans, interest and leverage work.

Legacy versus new rule side by side

Which rule applies to you right now

During the phase-in, FINRA says your firm may keep the old day-trading margin rules or move to the new system sooner, and firms may choose how they implement it. That leaves three practical steps.

1. Ask your broker directly whether your account is under the legacy PDT rules or the intraday margin rules, and from what date. FINRA's own advice is to contact your firm.
2. Read the firm's margin disclosure for its house requirements. Many firms require more than the 25% minimum for volatile stocks, leveraged ETFs or options.
3. Watch for the October 20, 2027 deadline. By then every firm must have moved off the legacy rules. If yours has not switched yet, expect the change before that date.

Pitfalls and misconceptions

• "The PDT rule is gone everywhere." Not yet. Until October 20, 2027, a firm may still count your day trades and enforce $25,000.
• "No PDT means unlimited day trading." The new rule still blocks or calls trading your equity cannot support, and repeated slow payment can still freeze an account.
• "Ending the day flat avoids a call." Under intraday margin the deficit is measured after each transaction, so a large mid-day position can create one even if it is closed by the bell.
• Ignoring house rules. A firm can be stricter than FINRA's minimum on every number.
• Confusing margin and cash accounts. The day-trade count never applied to cash accounts, but settlement rules there create their own violations.

How Finabase helps

Finabase is a research app; it does not hold accounts, execute trades or apply margin rules, so it cannot tell you your PDT status or margin level. That comes from your broker. What it can do is support the work around a trading day. A symbol page shows live quotes and intraday charts, and the performers view lists the day's biggest movers. If you keep a record of trades in a portfolio, each buy, sell, short and cover is stored with its date, which makes it easy to see how many same-day round trips you made in any week, a simple self-check if your firm still counts them.

Frequently asked questions

Is the pattern day trader rule still in effect in 2026?

It depends on your broker. FINRA's replacement took effect on June 4, 2026, but firms may keep the legacy PDT rules until October 20, 2027, so some accounts still face the four-trade count and the $25,000 minimum while others do not.

Do I still need $25,000 to day trade?

Not under the new intraday margin rules, which removed the $25,000 minimum. You still need $2,000 of equity to use margin at all, and a broker still on the legacy rules during the phase-in can continue to require $25,000.

Does the PDT rule apply to cash accounts?

No. Both the legacy day-trade count and the new intraday margin standard apply to margin accounts. Cash accounts have their own limit: you may only trade with settled funds, and selling before a purchase is paid for can trigger a violation.

What happens if I don't meet an intraday margin deficit?

Your firm will ask you to pay it as promptly as possible, and it stays outstanding for up to 15 business days. If you make a practice of paying late and miss the fifth business day, the firm must restrict new margin borrowing and short sales for 90 days or until you pay.

Do options trades count as day trades?

Under the legacy rule, yes: opening and closing the same option position on the same day was a day trade. Under the new rule, option trades are IML-reducing transactions like any other, and FINRA notes that intraday margin covers activity such as same-day-expiry (0DTE) options.

Summary

The legacy pattern day trader rule flagged anyone with four or more day trades in five business days in a margin account, then required $25,000 of equity, limited buying power to four times maintenance excess, and imposed a 90-day cash-only restriction for unmet calls. FINRA replaced it with an intraday margin standard effective June 4, 2026: no trade count and no $25,000 minimum, but a requirement that equity cover margin throughout the day, with deficits paid promptly and a narrower 90-day restriction for repeat late payers. Because firms may keep the old rules until October 20, 2027, the most important step is to ask your own broker which version applies to your account.