Margin Trading: How Buying on Margin Works, Risks, and Regulations in 2026

What Is Margin Trading and How Do Margin Accounts Work?

Margin trading means borrowing money from your brokerage firm to buy securities, using the assets already in your account as collateral. In a standard cash account, you can only purchase securities with the funds you deposit. A margin account, by contrast, lets your broker extend credit so you can control a larger position than your cash alone would allow. The SEC describes margin as "borrowing money to pay for stocks," and warns that while it can amplify gains, it equally amplifies losses—and you can lose more than you originally invested.[1]

Opening a margin account requires signing a margin agreement with your broker and meeting minimum equity requirements. FINRA Rule 4210 requires a minimum deposit of $2,000 in equity (or 100% of the purchase price, whichever is less) before you can trade on margin. Three terms define how margin works: initial margin is the percentage of the purchase price you must put up from your own funds; maintenance margin is the minimum equity level you must maintain after the purchase; and a margin call is your broker's demand for additional funds or securities when your equity falls below the maintenance threshold. Not all securities are marginable—penny stocks, recent IPOs, and certain volatile securities may be excluded from margin eligibility.[4]

This guide covers the complete landscape of margin trading in 2026: how buying on margin works mechanically, the regulatory framework under Federal Reserve Regulation T and FINRA Rule 4210, different types of margin accounts, margin call mechanics, interest costs and their tax implications, the amplified risks of leveraged trading, short selling on margin, conservative strategies, and suitability considerations. For position sizing strategies that account for leveraged risk, see our risk of ruin guide. To understand how capital gains taxes apply to your trades, see our capital gains tax guide.[3]

How Buying on Margin Works: Initial Margin, Buying Power, and a Step-by-Step Example

Federal Reserve Regulation T (12 CFR 220) sets the initial margin requirement at 50% for equity securities, meaning you must deposit at least half of the purchase price when buying stocks on margin. This requirement has remained at 50% since 1974, though the Federal Reserve retains the authority to raise or lower it. In practice, if you want to buy $20,000 worth of stock, you must deposit $10,000 from your own funds; the remaining $10,000 is a loan from your broker, secured by the securities you purchase. Some brokers impose higher initial margin requirements for volatile or concentrated positions—a stock with extreme price swings might require 70% or more.[3]

Your buying power equals your equity divided by the initial margin requirement. With $50,000 in equity and the standard 50% Reg T requirement, your buying power is $100,000—effectively 2:1 leverage. After purchasing securities, your remaining buying power depends on your "Reg T excess," which is the amount by which your equity exceeds 50% of the market value of your holdings. For example, if you own $60,000 of stock with $50,000 in equity (meaning $10,000 is borrowed), your Reg T excess is $50,000 minus (50% × $60,000) = $20,000, giving you $40,000 in additional buying power. Critically, buying power fluctuates with market prices—a decline in your holdings reduces your equity and available buying power simultaneously.[1, 2]

Consider a complete example that illustrates the double-edged nature of margin. You buy 200 shares of a $100 stock for a total cost of $20,000. With 50% initial margin, you deposit $10,000 and borrow $10,000. If the stock rises to $120: Your 200 shares are now worth $24,000. Subtract the $10,000 loan and your equity is $14,000—a $4,000 gain on $10,000 invested, or a 40% return. Without margin, the same 20% stock gain would have yielded only a 20% return on your money. If the stock falls to $80: Your shares are worth $16,000. Subtract the $10,000 loan and your equity is $6,000—a $4,000 loss on $10,000 invested, or a 40% loss. Without margin, you would have lost only 20%. Worse, you still owe the $10,000 to the broker plus accumulated interest, regardless of your losses. As the SEC warns, "you can lose more funds than you deposit in the margin account."[5, 12]

Types of Margin Accounts: Reg T Margin, Portfolio Margin, and Day Trading Margin

The standard margin account operates under Regulation T, providing 2:1 leverage with a 50% initial margin requirement and FINRA's 25% maintenance margin requirement. Most retail investors use Reg T accounts. However, individual brokers routinely impose stricter "house" maintenance requirements—typically 30% to 40% for common stocks, and considerably higher for concentrated positions, leveraged ETFs, or low-priced securities. These house requirements are always at least as stringent as FINRA's 25% minimum, and brokers can change them at any time without notice, even on existing positions.[4, 13]

Portfolio margin is available to qualified accounts—typically requiring $100,000 or more in equity—and uses risk-based models rather than fixed percentages to calculate margin requirements. Portfolio margin is based on the OCC's Theoretical Intermarket Margining System (TIMS), which evaluates the net risk of all positions in an account together, including the offsetting effect of hedged positions. For a well-diversified portfolio, this can result in significantly lower margin requirements and effective leverage of 6:1 or greater. However, for concentrated positions, portfolio margin may actually require more margin than Reg T. FINRA approved portfolio margin under amendments to Rule 4210, and it remains available only to sophisticated investors who understand the substantially higher risks that come with greater leverage.[20, 4]

The Pattern Day Trader (PDT) designation applies to anyone who executes four or more day trades within five consecutive business days in a margin account, provided those day trades represent more than 6% of total trading activity in the account during that period. FINRA's day trading rules require PDT accounts to maintain a minimum equity of $25,000 at all times—not just when you are actively trading. In exchange for meeting this threshold, PDT accounts receive 4:1 intraday buying power (compared to 2:1 for standard Reg T), meaning $25,000 in equity can control up to $100,000 in intraday positions. If your equity drops below $25,000, the account is restricted to closing transactions only until the minimum is restored. For the tax implications of frequent trading, see our day trading taxes guide.[15, 9]

Understanding Margin Calls: How They Are Triggered, What Happens, and How to Respond

A margin call occurs when the equity in your margin account falls below the broker's maintenance requirement. FINRA Rule 4210 sets the regulatory minimum at 25% of the current market value of all margin securities held long in the account, though most brokers impose higher house requirements of 30% to 40%. Here is how the math works: Suppose you own $40,000 of stock purchased with $10,000 borrowed, giving you $30,000 in equity (75% equity ratio). If the stock drops to $20,000, your equity becomes $10,000 ($20,000 minus the $10,000 loan), which is a 50% equity ratio—still above the 25% threshold. But if the stock drops further to $13,000, your equity is just $3,000 ($13,000 minus $10,000), or 23.1%—below the 25% minimum. A margin call is triggered, and you must deposit enough cash or securities to bring your equity back above the required level.[4, 11]

Several types of margin calls exist. A Federal (Reg T) call is triggered when you do not meet the initial margin requirement at the time of purchase. A maintenance call occurs when your equity drops below the broker's maintenance requirement on existing positions. A house call is triggered by the broker's own stricter internal requirements, which can exceed FINRA's minimums. A day trading call is issued when a pattern day trader's equity falls below $25,000. FINRA explains that margin calls must typically be met within two to five business days, but brokers retain the contractual right to liquidate positions immediately and without prior notice—even if they have previously given you a specific deadline.[11, 5]

When a broker executes a forced liquidation, the consequences can be severe. The broker has the contractual right to sell your securities without your consent and without consulting you on which positions to liquidate. Brokers typically sell the most liquid holdings first, which may be your best-performing positions, leaving you with concentrated exposure to your worst performers. During periods of broad market stress, forced selling across many margin accounts creates a cascading effect: liquidations push prices lower, triggering additional margin calls for other investors, which drives further selling. The March 2020 COVID-19 crash and the April 2025 tariff-driven selloff both produced waves of margin-call-driven forced liquidation that amplified the initial declines.[12, 1]

To prevent margin calls and their costly consequences: (1) Maintain a substantial equity buffer above the maintenance requirement—targeting 50% or more equity gives you significant room before a call is triggered. (2) Monitor your margin utilization daily, especially during volatile markets when prices can gap down overnight. (3) Set stop-loss orders on all margined positions to automatically limit potential losses before they trigger a margin call. (4) Diversify across uncorrelated assets to reduce the chance that a single stock's decline wipes out your margin cushion. (5) Keep cash reserves available to meet a margin call promptly if one occurs. If you do receive a margin call, you can respond by depositing additional cash, depositing marginable securities, or selling existing positions to raise equity. Ignoring a margin call results in forced liquidation at the broker's discretion and potential account restrictions.[11, 2]

Margin Interest: The Hidden Cost of Borrowing and Its Impact on Returns

Brokers charge interest on the funds you borrow in a margin account, and this cost directly reduces your investment returns. Margin interest rates are typically based on a base rate (often called the "broker call rate") plus a spread that varies by broker and by the size of your margin loan—larger balances generally receive lower rates. As of early 2026, with the Federal Reserve's target rate at 3.50–3.75%, Fidelity's margin rates range from 7.50% for balances above $1 million to 11.825% for balances under $25,000, with a base rate of 10.575%. The SEC's investor bulletin on margin interest emphasizes that these rates can vary significantly between firms and that investors should compare rates before opening a margin account.[21, 6]

Interest accrues daily on your outstanding margin balance and is typically charged to your account monthly. The impact on net returns can be substantial. Consider a scenario: you purchase $20,000 of stock using 50% margin ($10,000 equity, $10,000 borrowed) at a 10.5% annual margin rate. If the stock earns 10% over a year ($2,000 gain), your margin interest on the $10,000 loan is approximately $1,050. Your net profit is $2,000 minus $1,050 = $950 on your $10,000 equity, yielding a 9.5% return—barely better than the 10% you would have earned without margin and without the additional risk. For margin to produce a meaningful excess return after interest costs, the investment must significantly outperform the borrowing rate. In a moderate-return environment, margin interest can transform a modestly profitable position into a net loss.[1, 2]

There is one partial offset: margin interest may be tax-deductible. Under IRS Publication 550, margin interest qualifies as "investment interest expense" and can be deducted on your tax return using Form 4952. However, the deduction is limited to your net investment income—you cannot deduct margin interest in excess of investment income (dividends, interest, short-term capital gains) for a given tax year. Long-term capital gains and qualified dividends that are taxed at preferential rates are excluded from "net investment income" unless you elect to include them, which means giving up the preferential rate on those gains. Any unused investment interest expense can be carried forward to future years. This is a complex area of the tax code, and professional tax advice is strongly recommended to ensure you claim the deduction correctly.[16, 17]

The Risks of Margin Trading: Amplified Losses, Forced Selling, and Unlimited Loss Potential

The most fundamental risk of margin trading is amplified losses. While 2:1 leverage doubles your buying power, it also doubles your loss rate relative to your equity. A 25% decline in a fully margined position translates to a 50% loss of your equity. A 50% decline wipes out 100% of your equity—your entire investment is gone, and you still owe the broker for the borrowed amount plus interest. The mathematics of drawdown recovery become punishing at these levels: recovering from a 50% loss requires a 100% gain, and recovering from a 75% loss requires a 300% gain. For a deeper analysis of how drawdowns compound, see our risk of ruin guide. The SEC explicitly warns that margin investors "can lose more money than you have invested."[1, 2]

Forced liquidation at the worst possible prices is a systemic risk unique to margin accounts. When markets decline sharply, margin calls hit many accounts simultaneously, creating a cascade of forced selling that deepens the decline. Your broker may liquidate your most liquid, best-performing holdings first—since those are the easiest to sell—leaving you with concentrated exposure to your weakest positions. This "adverse selection" in forced liquidation compounds losses beyond what the market decline alone would cause. You have no control over timing, price, or which securities are sold. The FINRA investor education page states clearly: your brokerage firm "can sell your securities without contacting you" and is "not required to give you an extension of time on a margin call."[12, 11]

Unlike a cash account where your maximum loss is the amount you invested, margin trading carries the risk of losing more than your initial deposit. If the securities in your account decline so severely that selling everything does not cover the outstanding loan, you owe the broker the deficiency. This debt is legally enforceable, and the broker can pursue collection. For short sellers using margin, the risk is theoretically unlimited because a stock's price can rise without bound. Additionally, margin interest rates are variable and linked to benchmark rates. If interest rates rise unexpectedly, your cost of carry increases even if your positions remain flat, potentially turning a breakeven position into a net loss. Margin interest is charged regardless of whether your positions are profitable.[5, 14]

Margin Trading Rules and Regulations: Federal Reserve, FINRA, and SEC Requirements

Federal Reserve Regulation T (12 CFR 220) is the primary federal regulation governing the extension of credit by broker-dealers for securities purchases. Reg T sets the initial margin requirement at 50% for equity securities—a level that has remained unchanged since the Fed lowered it from 65% in 1974. Although the Federal Reserve has the authority to raise initial margin requirements during periods of excessive speculation (it did so during the late 1960s bull market), this power has not been exercised in over 50 years. Reg T also governs "good faith" deposit requirements for cash accounts and establishes the rules against free-riding, which occurs when an investor buys and sells a security before paying for it.[3]

FINRA Rule 4210 supplements Regulation T with ongoing maintenance requirements. Key provisions include: a minimum maintenance margin of 25% of the current market value for long equity positions; a higher 30% minimum for short positions; elevated requirements for concentrated accounts where a single security represents a large percentage of the account; special margin requirements for leveraged ETFs, which may require maintenance margins of 50% to 100% of the fund's leverage factor; and the authority to impose "special margin" on specific securities during periods of extreme volatility. FINRA can increase margin requirements on individual stocks with little or no advance notice when it determines that a security's risk profile warrants additional protection.[4, 13]

The SEC provides additional layers of investor protection in the margin context. Brokers must provide a margin disclosure statement to customers before opening a margin account, explaining the risks and mechanics of margin trading. SEC Rule 15c3-1 (the Net Capital Rule) requires broker-dealers to maintain minimum net capital at all times, providing a layer of solvency protection. If a brokerage firm fails, the Securities Investor Protection Corporation (SIPC) provides up to $500,000 in protection per customer account, including a $250,000 limit for cash. However, SIPC protection covers broker insolvency only—it does not protect against market losses from margin trading or poor investment decisions.[18, 5]

Short Selling on Margin: Mechanics, Risks, and the Short Squeeze

Short selling—borrowing shares from your broker, selling them on the open market, and hoping to buy them back later at a lower price—can only be executed in a margin account because you are selling securities you do not own. The SEC's introduction to short sales explains the basic mechanics: the proceeds from the short sale are held as collateral, and you must also deposit additional margin. Regulation T requires a total deposit of 150% of the short sale value—the 100% sale proceeds plus an additional 50% initial margin from your own funds. For example, short selling $10,000 worth of stock requires the $10,000 in proceeds to remain in the account plus $5,000 in additional margin, for a total of $15,000. FINRA's maintenance requirement for short positions is 30%, higher than the 25% required for long positions, reflecting the elevated risk.[7, 4]

The defining risk of short selling is theoretically unlimited loss potential. When you buy stock, your maximum loss is the stock going to zero—a 100% loss. When you short a stock, there is no cap on how high the price can rise, and therefore no cap on your potential losses. A stock you shorted at $50 could rise to $200, $500, or beyond, and you are obligated to buy it back at whatever the market price is. A short squeeze dramatically accelerates this risk: when a heavily shorted stock begins to rise, short sellers rush to cover their positions by buying shares, which drives the price higher, forcing more short sellers to cover, creating a self-reinforcing spiral of buying pressure and escalating losses. Beyond the price risk, short sellers pay ongoing stock borrow fees (also called "hard-to-borrow" fees), which can range from less than 1% annually for widely available shares to 50% or more annually for heavily shorted or illiquid stocks.[7, 10]

Margin calls on short positions operate in reverse compared to long positions, and the dynamics are particularly dangerous. When you hold a long position, the stock must fall for a margin call to occur, and you can choose to wait for a recovery. With a short position, the stock must rise for a margin call to be triggered—and a rising stock simultaneously increases your loss and reduces your margin cushion. This creates a vicious feedback loop with no natural floor. Additionally, the broker can "recall" borrowed shares at any time, forcing you to buy them back regardless of timing or price. FINRA's higher maintenance requirement of 30% for short positions (versus 25% for longs) reflects the recognition that short selling carries fundamentally asymmetric risk.[4, 11]

Conservative Margin Strategies: When Borrowing Makes Sense and How to Manage Risk

Not all margin usage is speculative. One conservative application is bridge financing—using margin to purchase a security while waiting for settlement proceeds from another sale (to avoid free-riding violations under Reg T) or while a wire transfer is in transit. In this scenario, margin is used for convenience rather than leverage, the borrowed amount is repaid within days, and the interest cost is negligible. Similarly, investors with diversified portfolios sometimes use margin for short-term liquidity events—such as covering an unexpected expense or seizing a time-sensitive investment opportunity—rather than selling existing holdings and triggering taxable gains. Charles Schwab notes that this approach can be more tax-efficient than liquidating positions, provided the margin balance is repaid promptly.[22, 3]

Sophisticated investors may also use margin to implement hedging strategies—for example, purchasing protective put options while fully invested in equities, or maintaining a small short position in a correlated index as a hedge against a concentrated long position. In these cases, the margin is used to hold the hedge, not to increase net market exposure. The critical distinction is whether margin usage increases or decreases total portfolio risk. A margined hedge that reduces overall risk is fundamentally different from using margin to amplify a directional bet. The CFP Board's fiduciary standards require financial professionals to assess whether any leveraged strategy is suitable for the specific client's risk tolerance, time horizon, and financial situation.[19, 20]

If you choose to use margin for leveraged trading, disciplined risk management is essential. (1) Never use more than 25–30% of your available margin—maintain a substantial buffer above maintenance requirements so that normal market fluctuations do not trigger margin calls. (2) Apply the 1% risk-per-trade rule to your equity, not your total buying power. If you have $50,000 in equity and $50,000 in margin, risk no more than $500 per trade (1% of equity), not $1,000 (1% of buying power). (3) Set hard stop-loss orders on every margined position and honor them without exception. (4) Monitor your margin utilization daily and reduce exposure during high-volatility periods (such as when the VIX exceeds 25). (5) Never add to a losing margined position—"averaging down" with borrowed money is one of the fastest paths to catastrophic loss.[2, 1]

Who Should and Should Not Use Margin: Risk Assessment and Alternatives

Margin trading may be appropriate for experienced traders who have a proven track record of profitability, strong risk management discipline, and adequate capital reserves to absorb potential losses beyond their initial investment. Investors with large, well-diversified portfolios who use margin sparingly—for temporary liquidity needs, strategic hedging, or bridge financing—rather than as ongoing leverage, are using margin in a way that the regulatory framework was designed to support. Anyone using margin should thoroughly understand the complete regulatory framework (Regulation T, FINRA Rule 4210, house requirements), have a pre-planned response for margin calls, and accept the possibility that they could lose more than they invested.[19, 2]

Margin trading is not suitable for beginning investors who have not yet developed risk management skills. It is dangerous for traders with small accounts where a single margin call could deplete the entire balance. Anyone who cannot afford to lose more than their initial deposit should not trade on margin—the legal obligation to repay the broker's loan even after a total loss of equity is a burden many inexperienced traders do not fully appreciate until it happens. The SEC warns that most individual day traders lose money, and using margin to amplify losing strategies only accelerates the damage. Emotional traders who may freeze during a rapid decline and fail to execute stop-losses are particularly vulnerable to margin-driven catastrophic losses.[8, 1]

For investors seeking higher returns without borrowing, several alternatives exist. Leveraged ETFs provide built-in leverage (typically 2x or 3x) without a margin account, but carry their own risks including daily rebalancing decay that erodes value over time—they are designed for short-term tactical use, not long-term holding. For the complete picture on ETF mechanics and risks, see our ETF investing guide. Options strategies can provide leveraged exposure with defined, limited risk—a long call option, for example, gives you upside participation with a maximum loss limited to the premium paid. And the most reliable path to building wealth remains the simplest: increasing your savings rate and letting compound interest work over decades. A disciplined investor who contributes consistently to a diversified portfolio and reinvests returns will build substantial wealth without ever borrowing a dollar.[10, 2]

Frequently Asked Questions About Margin Trading

Below are the most common questions about margin trading, margin calls, and the regulations that govern leveraged investing. For a hands-on look at how compound growth builds wealth over time without leveraged risk, try our calculator.[2]