What Is 4x Intraday Buying Power and What Happens at the Close?

Up to 4x intraday buying power is a broker feature built on FINRA's 25% maintenance margin requirement, and it applies only during the trading day. Because 1 divided by 0.25 is 4, an account that is charged just 25% maintenance on a stock can hold about four times its equity in that stock at the peak. When the market closes, positions that rely on that intraday leverage must fit the broker's higher overnight margin requirement, which is why traders often have to sell part of a position before the close. As of October 2026, FINRA's rules do not name 4x, so the multiple, the opt-in terms, and the cutoff time are each set by the individual broker.

What does "up to 4x intraday buying power" actually mean?

It means a broker is letting eligible margin accounts size positions against the 25% maintenance requirement instead of the 50% Reg T initial requirement. The multiple is simple arithmetic: at 25%, each dollar of equity supports $4 of long exposure, and the "up to" in the label reflects that the real limit depends on each stock's requirement. That is our calculation, not a figure from a rule.

The 25% comes from FINRA's intraday margin guidance for investors, which sets maintenance at 25% of the current market value of long margin-eligible stocks and a $2,000 minimum equity for leveraged trading. FINRA Regulatory Notice 26-10 says the new rule does not change regular maintenance margin requirements but supplements them. The standards took effect on June 4, 2026, with an 18-month phase-in that runs to October 20, 2027, so brokers are moving at different speeds. The older "day-trading buying power" tied to the pattern day trader label is the legacy version of this idea, and hi2morrow's guide to what replaced the PDT rule in 2026 covers how that framework was replaced.

Is 4x intraday margin a FINRA rule or a broker policy?

It is a broker policy that sits on top of FINRA's floor. The same FINRA guidance states that a firm has the authority to impose higher requirements, and nothing in Notice 26-10 sets a leverage multiple. The 4x figure appears in broker announcements, not in the rule text. Initial margin is a separate layer: Regulation T, 12 CFR 220.12, sets initial margin for equity securities at 50% of current market value, which is where the roughly 2x overnight figure comes from.

Major retail brokers have been rolling out up to 4x intraday buying power for eligible margin accounts during 2026, usually based on a default 25% maintenance requirement for most stocks and often as an opt-in feature. The terms are each broker's own: who is eligible, which stocks get the 25% rate, how buying power is calculated during the day, and whether the feature can be changed or withdrawn without notice. Not every broker offers 4x, so the multiple on your screen is the one that counts.

What happens to 4x buying power when the market closes?

Positions opened with intraday leverage must satisfy the broker's overnight margin requirement to stay open after the close, and that requirement is higher. Broker disclosures for intraday margin typically say the extra leverage is available only during the trading day and that positions must meet the standard overnight requirement by the cutoff. If the account does not act in time, a margin call may be issued, and the firm may liquidate some or all positions without prior notice.

For a rough sense of the overnight limit, Reg T's 50% initial requirement points to about 2x equity. That is our arithmetic, and a broker's actual overnight requirement can differ by stock and by account, so the overnight buying power shown on the account screen is the figure to plan around.

The cutoff also differs by broker. Some tie it to the regular-session close at 4:00 p.m. ET, while others let intraday leverage run until the end of the trading day as late as 8 p.m. ET and expect any excess over overnight buying power to be gone by then. Check which one your account uses. If the morning screen shows less buying power than you expected, hi2morrow's piece on why buying power can change overnight walks through the diagnosis, including the causes that have nothing to do with intraday margin.

How much cushion is left when you use all 4x?

There is none at the ceiling, because equity exactly equals the 25% maintenance requirement, so any decline in the position creates a deficit. Take a stock called ABC at $50 and an account with $10,000 of equity, and assume a 25% requirement on ABC. Using the full 4x means holding 800 shares worth $40,000 against a $30,000 loan, with maintenance of $10,000 equal to the account's equity. The first tick lower leaves the account short.

A smaller position leaves room. Buying 640 shares of ABC at $50 at 10:00 a.m. ET is a $32,000 position funded with $10,000 of equity and a $22,000 loan, so maintenance is $8,000 and the cushion is $2,000. Equity falls to the 25% requirement when the position is worth about $29,333, because $29,333 minus the $22,000 loan equals 25% of $29,333. That is a price near $45.83, or a decline of about 8.3%. Anything below that is a deficit.

Under FINRA's framework, a deficit is not forgotten at the close. Notice 26-10 says it remains outstanding for 15 business days unless satisfied sooner, and that a customer who makes a practice of leaving deficits unmet and fails to cover one by the fifth business day can be barred from creating or increasing short positions or debit balances for 90 calendar days. Brokers can also act much faster than the minimum, as the next section shows.

What can go wrong if you hold a 4x position into the close?

The largest risk is a forced sale at a price you did not choose. Using the same ABC example with a 2x overnight limit as an assumption, an overnight limit of about $20,000 on $10,000 of equity means the $32,000 position needs to shrink to about $20,000 by the close. That is 240 shares sold at $50, leaving 400 shares. If the stock has slipped to $47 by then, equity is down to $8,080, the limit falls to about $16,160, and roughly 296 of the 640 shares have to go, which locks in a loss that the leverage amplified. If the account does not act, the broker can issue a margin call or sell positions without prior notice.

The overnight line is also not fixed. Brokers can vary maintenance requirements with a stock's volatility, concentration, liquidity, or other factors, and FINRA's guidance lets a firm set requirements above 25%. A fast-moving small cap may carry a house requirement of 50% or more, which cuts the intraday multiple well below 4x before the close ever matters. Policies can also change: brokers generally reserve the right to change or end intraday margin without notice, and alerts before the close are a courtesy that may leave little time to react.

Alexander Styopin's professional view: the 4x number tells you the most that is possible and very little about what is sensible. Most of the damage in leveraged intraday trading comes from sizing to the ceiling, then meeting a close that requires half the position to go. A practical habit is to size the trade to the overnight limit unless the plan genuinely is to be flat by the close, and to treat the extra intraday room as a buffer rather than as capital to deploy.

How do you check your own limits before using it?

Start with the account screen. Brokers that offer intraday margin typically show intraday and overnight buying power as separate numbers, and the overnight figure is the one a position must fit by the close. Next, look up the house requirement for the specific stock, since a 25% rate is a default for most names and not a promise for every ticker. Then find the cutoff your broker uses, whether that is the regular-session close or a later time such as 8 p.m. ET, and learn how opt-in works, because some brokers turn on 4x only for eligible customers who ask for it.

If an answer is not on the screen or in the help center, ask support in writing and keep the reply. The questions worth asking are what the overnight requirement is for your stock, at what time the check runs, and what happens first if a deficit appears, whether a margin call or a sale. For the separate question of which cash is settled and which is only available to trade, hi2morrow's explainer on available, settled, and withdrawable cash draws the lines.

Educational material only. Not investment or legal advice. Margin, buying power, and settlement rules can vary by broker, account type, and jurisdiction, and broker policies described here may change without notice.

Author: Alexander Styopin, hi2morrow analyst and economist with 25 years of experience in the US stock market