For more than two decades, one number shaped how US retail traders approached short-term stock trading: $25,000. Under the old pattern day trader (PDT) framework, margin account holders who made four or more day trades within five business days generally had to keep at least that much equity in the account. In 2026 that framework was rewritten. This article explains what changed, how the replacement “intraday margin” approach works, and what traders still need to manage.
Educational content, not investment advice.
What the old pattern day trader rule did
The PDT designation was built on counting. A day trade means opening and closing the same position within one trading day. A margin customer who made four or more of them inside five business days was generally flagged as a pattern day trader and had to maintain $25,000 in equity. Accounts that fell below the line were typically restricted to closing transactions until equity was restored.
The rule was widely criticized because trade count is a blunt proxy for risk. A trader making four small, well-sized round trips could be flagged, while a trader holding one oversized overnight position was not.
What changed in 2026
According to a legal summary published by the law firm King & Spalding, the SEC approved amendments to FINRA Rule 4210 on April 15, 2026. FINRA followed with Regulatory Notice 26-10 on April 20, 2026. The amendments took effect on June 4, 2026, with an 18-month phase-in running through October 20, 2027 for firms that need extra time to build systems.
The amendments remove the pattern day trader regime, including the four-trades-in-five-days test, the $25,000 minimum equity requirement, and the day-trading buying power calculations. Brokerage firms have published their own notices describing how they implemented the change; E*TRADE, for example, states that day trades are no longer counted and that its $2,000 minimum for margin accounts continues to apply.
Because firms are phasing in and may add their own policies, the practical experience can differ from broker to broker. The primary sources are the rule text and Regulatory Notice 26-10, and each broker’s margin agreement governs an individual account.
How intraday margin works
The replacement framework measures risk differently. Instead of counting trades, it looks at a customer’s maximum exposure during the day. Key terms from the summary:
- Intraday Margin Level (IML): the amount a customer could withdraw, or would need to deposit, while still meeting maintenance margin.
- Intraday margin deficit: the most negative IML reached during the day after a transaction that reduces it.
- Monitoring approach: firms may watch accounts in real time and block trades that would create or increase a deficit, or they may run a single end-of-day calculation to find the day’s largest deficit.
In plain terms, buying power becomes a live number tied to how much margin cushion remains at any moment, rather than a fixed multiple of prior-day equity. A position that moves against the trader, or a larger position than the account can support, can use up that cushion quickly.
What happens if a deficit occurs
Deficits must be satisfied as promptly as possible through deposits or by liquidating positions. Under the summarized rule, they can remain outstanding for up to 15 business days. If a customer fails to meet a deficit by the fifth business day, and does so as a practice, the firm must impose a 90-day restriction on new debit balances or short positions, other than trades that close existing positions. Small deficits, up to the lesser of 5% of equity or $1,000, are excepted, as are deficits arising from extraordinary circumstances.
Broker implementations may be stricter than the rule’s outer limits. E*TRADE describes a five-business-day window to meet an intraday margin deficit call and says three violations in a rolling 12-month period can lead to a 90-day restriction. Those are one firm’s terms, not a universal standard.
What did not change
- Losses can exceed deposits. Margin remains borrowed money. Losses on a margined position can be larger than the cash a trader put in, and a margin call can force liquidation at an unfavorable price.
- Disclosure and approval rules remain. The amendments do not modify FINRA Rules 2130 and 2270, which cover account approval and risk disclosure for firms promoting day trading.
- Brokers still set their own limits. Firms may apply house requirements, higher margin rates on volatile securities, or tighter surveillance.
- Other account types have their own rules. This article concerns margin accounts only; cash and retirement accounts follow separate settlement and trading restrictions that should be checked with the broker.
A quick comparison
| Feature | Old PDT framework | Intraday margin framework |
|---|---|---|
| Trigger | Four or more day trades in five business days | Maximum intraday margin exposure |
| Equity floor | $25,000 for flagged accounts | No $25,000 rule; broker minimums (such as $2,000 at one firm) still apply |
| Buying power | Based on prior-day equity | Based on live margin cushion |
| Main risk control | Trade counting | Real-time or end-of-day deficit monitoring |
Practical habits under the new regime
Removing a hard equity threshold does not make frequent trading cheaper or safer. A smaller account can now trade intraday more often, but it also has less room for error. Several habits are worth considering:
- Treat buying power as a ceiling, not a target. Many traders size positions by risk per trade, a small percentage of account equity, rather than by how much the broker will lend.
- Know the broker’s deficit policy. Read the margin agreement and any published notice on cure periods, restrictions and how deficits are calculated.
- Watch the live margin figure. Because the cushion changes with prices, positions that looked comfortable at the open can look different after a volatile move.
- Account for costs. Commissions, spreads, slippage and margin interest still apply, and they compound for high-frequency styles.
- Keep records. Day trading results are taxable events, and a clean log of fills makes tax reporting and performance review far easier.
The bottom line
The 2026 amendments to FINRA Rule 4210 replaced a trade-counting rule with a risk-based, intraday approach. The $25,000 threshold and the four-trade test are gone, but the underlying reality of leveraged trading is the same: borrowed money magnifies losses as well as gains, and brokers retain the right to restrict accounts that overreach. Traders who understand how their own firm calculates intraday margin, and who size positions conservatively, are better placed to handle the change.
Educational content, not investment advice. Rules and broker policies change; confirm current requirements with FINRA, the SEC and your brokerage firm.
