Margin trading is one of the most powerful—and risky—tools in an investor’s toolkit. By borrowing money from your broker to buy securities, you can amplify your gains. But leverage cuts both ways: it magnifies losses just as much as gains, and in extreme scenarios, you can lose more than you initially deposited. This guide covers how margin trading works, how to calculate when you’ll face a margin call, and the real risks that every margin trader must understand.
How Margin Trading Works
Margin trading allows you to borrow money from your broker to purchase securities, using your existing cash and securities as collateral. Instead of paying the full purchase price upfront, you put up a percentage (typically 50% in the U.S.) and borrow the rest from your broker.
Margin trading is the practice of buying securities by borrowing part of the purchase price from your broker. Your investment is split into two components: your own cash (equity) and borrowed funds (the margin loan). The borrowed funds accrue interest daily and must be repaid when you sell the securities.
Here’s a simple example: You want to buy $20,000 worth of stock but only have $10,000 in cash. With a margin account, you can borrow the additional $10,000 from your broker, buy the full $20,000 position, and pay interest on the $10,000 loan. If the stock rises, your gains are amplified. If it falls, your losses are amplified—and if it falls too far, you’ll face a margin call or forced liquidation.
Margin trading is fundamentally different from simply having financial leverage as a concept. This article focuses on the mechanics, regulations, and risks specific to margin accounts, while the financial leverage article covers the broader theoretical framework of leverage in investing.
U.S. Margin Rules and Requirements
Margin trading in the United States is governed by a combination of federal regulations, self-regulatory organization (SRO) rules, and individual broker policies. Understanding these layers is critical because your broker’s requirements can—and often do—exceed the regulatory minimums.
Regulation T (Reg T)
Regulation T is a Federal Reserve rule that sets the initial margin requirement at 50% for margin-eligible securities. This means you must pay for at least half the purchase price with your own cash. For a $20,000 stock purchase, you must deposit $10,000 and can borrow up to $10,000.
FINRA Minimum Maintenance Margin
The Financial Industry Regulatory Authority (FINRA) requires a maintenance margin of at least 25% for long stock positions. This is the minimum equity you must maintain relative to the current market value of your position. If your equity percentage falls below this threshold, your broker can issue a margin call or force-liquidate your position.
Important: 25% is just the floor. Most brokers set their “house” maintenance requirements higher—commonly 30% to 40%.
Broker House Rules
Brokers have the authority to set stricter requirements than Reg T and FINRA minimums. Common house rules include:
- Higher maintenance margins: 30% or 40% instead of 25%
- Minimum account balance: $2,000 equity required to open a margin account (FINRA rule)
- Security-specific requirements: Certain stocks may have higher margin requirements based on liquidity, volatility, or price
Security-Specific Margin Requirements
| Security Type | Typical Initial Margin | Typical Maintenance Margin |
|---|---|---|
| Standard stocks (liquid, over $5) | 50% | 25%-30% |
| Low-priced stocks (under $5) | 100% (no margin) | 100% |
| Leveraged ETFs (2x, 3x) | 50%-100% | 75%-100% |
| Concentrated positions (>20% of account) | 50%+ | 30%-50% |
| High-volatility stocks | 50%-100% | 30%-100% |
Your broker can change margin requirements at any time—even intraday—without advance notice. During periods of market volatility, brokers frequently increase maintenance requirements on specific securities or across entire accounts. When this happens, you may face an immediate margin call even if your positions haven’t moved.
Additionally, when a margin call is triggered, your broker has complete discretion: they can liquidate positions without prior warning, choose which securities to sell, and execute at prevailing market prices. You remain liable for any remaining debit balance after liquidation.
Initial Margin vs Maintenance Margin
The two most important margin concepts are initial margin and maintenance margin. Confusing these terms is one of the most common mistakes new margin traders make.
Initial Margin
- Purpose: Minimum equity to OPEN a position
- Reg T requirement: 50% for margin securities
- Example: To buy $20,000 stock, you need $10,000 cash
- Applies only at purchase
- Can fall below initial margin after purchase without triggering margin call
Maintenance Margin
- Purpose: Minimum equity to KEEP a position open
- FINRA minimum: 25% (brokers often use 30%+)
- Example: $20,000 position requires $5,000-$6,000 equity minimum
- Applies continuously after purchase
- Falling below triggers margin call → forced liquidation
How Equity Percentage Changes
Your equity percentage is calculated as:
Here’s how equity percentage changes as the stock price moves:
Position: Buy 200 shares at $100/share = $20,000 with 50% initial margin ($10,000 cash, $10,000 loan)
| Stock Price | Market Value | Loan | Equity | Equity % | Status |
|---|---|---|---|---|---|
| $130 | $26,000 | $10,000 | $16,000 | 61.5% | ✅ Safe |
| $100 | $20,000 | $10,000 | $10,000 | 50.0% | ✅ Initial purchase |
| $80 | $16,000 | $10,000 | $6,000 | 37.5% | ✅ Safe (above 30%) |
| $66.67 | $13,334 | $10,000 | $3,334 | 25.0% | ⚠️ Margin call trigger |
| $60 | $12,000 | $10,000 | $2,000 | 16.7% | ❌ Below maintenance |
Notice that you can fall below the 50% initial margin (e.g., at $80/share you’re at 37.5%) without a margin call. But once you hit the 25% maintenance threshold ($66.67/share), the broker can liquidate immediately.
Margin Call Formula (With Example)
The single most important calculation in margin trading is determining the margin call price—the stock price at which your equity percentage falls to the maintenance margin and triggers forced liquidation. Most margin traders never calculate this number before entering a trade, and that’s a critical mistake.
Where:
- Purchase Price: The price per share you bought at
- Initial Margin: The percentage of equity you put up (e.g., 0.50 for 50%)
- Maintenance Margin: The broker’s maintenance requirement (e.g., 0.25 for 25%)
Step-by-Step Derivation
Why does this formula work? Let’s derive it:
- At the margin call price, your equity must equal exactly the maintenance margin percentage of the market value.
- Equity = Market Value – Loan Amount
- Loan Amount = Purchase Price × Number of Shares × (1 – Initial Margin)
- Set Equity / Market Value = Maintenance Margin and solve for the price
The result: Margin Call Price = Purchase Price × (1 – Initial Margin) / (1 – Maintenance Margin)
Setup:
- Buy 200 shares at $100/share = $20,000 total
- Initial margin: 50% → you pay $10,000 cash, borrow $10,000
- Maintenance margin: 25% (FINRA minimum; many brokers use 30%+)
Calculate margin call price:
Margin Call Price = $100 × (1 – 0.50) / (1 – 0.25)
= $100 × 0.50 / 0.75
= $66.67 per share
Verification: At $66.67/share:
- Market Value = 200 shares × $66.67 = $13,334
- Loan = $10,000 (unchanged)
- Equity = $13,334 – $10,000 = $3,334
- Equity % = $3,334 / $13,334 = 25.0% ✓
Key insight: The stock only needs to fall 33.3% (from $100 to $66.67) to trigger a margin call—not 40%, not 50%. This is far less than most traders expect.
Calculate your margin call price BEFORE entering the trade. Know exactly how much downside you can tolerate. If the margin call price is only 10-15% below your purchase price, you’re over-leveraged and should reduce your position size or use less margin.
What Happens During a Margin Call
When your equity percentage falls below the maintenance margin, you have three options:
- Deposit more cash immediately: Add funds to bring your equity back above the maintenance threshold
- Sell securities yourself: Liquidate some or all of your position to reduce the loan amount
- Broker force-liquidates (most common): The broker sells your securities at prevailing market prices
Your broker has complete control over liquidation. When a margin call is triggered, the broker can:
- Liquidate positions immediately without prior notice
- Choose which securities to sell (you have no say)
- Execute at current market prices, regardless of slippage or illiquidity
- Sell as much as necessary to restore the account to compliance
Margin calls happen at the worst possible time—during maximum drawdown periods when prices are at their lowest. You’re forced to sell at exactly the wrong time, locking in permanent losses that a cash-account investor could simply wait out.
Margin Trading Example (Gains and Losses)
To truly understand how margin trading amplifies both gains and losses, let’s walk through three scenarios with the same initial position. These examples use real numbers and include margin interest costs, which many traders overlook.
Initial Setup (All Three Scenarios):
- Buy 200 shares at $100/share = $20,000 total position
- Your cash: $10,000 (50% initial margin)
- Borrowed from broker: $10,000
- Margin interest rate: 11.8% annual (typical for small retail accounts as of February 2026)
- Holding period: 6 months
Scenario 1: +30% Stock Gain
The stock rises from $100 to $130 (+30%)
- Market value increases: $20,000 → $26,000
- Sell all shares: Receive $26,000
- Repay loan: $26,000 – $10,000 = $16,000 left
- Gross return on your equity: ($16,000 – $10,000) / $10,000 = +60%
Factor in margin interest:
- Interest ≈ $10,000 × 0.118 × 0.5 = $590 (simplified; interest typically compounds monthly when posted)
- Net proceeds after interest: $16,000 – $590 = $15,410
- Net return: ($15,410 – $10,000) / $10,000 = +54.1%
Lesson: The stock rose 30%, but you gained 54% after interest (approximately 2x leverage minus financing costs). Without margin, you would have made 30%.
Scenario 2: -33% Loss (Margin Call Trigger)
The stock falls from $100 to $66.67 (-33.3%)
- Market value decreases: $20,000 → $13,334
- Your equity: $13,334 – $10,000 loan = $3,334
- Equity percentage: $3,334 / $13,334 = 25% → MARGIN CALL TRIGGERED
- Broker force-liquidates at $13,334
- You receive: $13,334 – $10,000 loan = $3,334
- Your loss: ($3,334 – $10,000) / $10,000 = -66.6%
Lesson: The stock fell only 33%, but you lost 67% of your capital (approximately 2x leverage). Without margin, you would have lost 33% and could have held on for a potential recovery. Instead, forced liquidation locked in permanent losses.
Note: This scenario doesn’t include the interest you paid while holding the position, which would make the loss even worse.
Scenario 3: -60% Gap-Down (YOU CAN LOSE MORE THAN DEPOSITED)
The stock gaps down overnight to $40/share (-60%) due to bad earnings, fraud announcement, or trading halt
- Market value crashes: $20,000 → $8,000
- Broker liquidates immediately at prevailing market price: $8,000
- Proceeds from sale: $8,000
- Loan still owed: $10,000
- Debit balance: You owe the broker $2,000 ($10,000 – $8,000)
Total loss calculation:
- Lost your entire $10,000 deposit
- PLUS you owe $2,000 more to your broker
- Total loss: -$12,000 on a $10,000 investment = -120% return
CRITICAL LESSON: You CAN lose more than you deposited. This happens in gap-down scenarios (overnight news, trading halts, flash crashes, illiquid stocks). Cash accounts cannot have this problem—the worst you can lose in a cash account is 100% of your investment.
Margin interest accrues daily and typically compounds monthly when posted. At 11.8% annual on a $10,000 loan, you’re paying approximately $3.23 per day or $98 per month. If the stock goes sideways, you’re losing money to interest with no gains to offset it. Over a year, that’s $1,180 in interest—an 11.8% loss on your capital before any stock movement.
Margin Trading vs Cash Account
Should you trade on margin or stick with a cash account? Understanding the trade-offs is essential for making an informed decision.
Margin Trading
- Amplified gains: 2x leverage with 50% margin (30% stock gain → 54% return)
- Amplified losses: CAN lose more than deposited in gap scenarios
- Interest costs: 11-12% annual typical for small balances
- Margin call risk: Forced liquidation without notice during drawdowns
- Can short sell: Borrow shares to bet on price declines
- Requirements: $2,000 minimum, broker approval, ongoing monitoring
- Daily interest accrual: Compounds every day, even on losing positions
Cash Account
- No leverage: Returns match stock performance (30% gain → 30% return)
- Limited losses: Can’t lose more than invested (except with options)
- No interest costs: Zero financing costs
- No margin calls: Can hold through drawdowns indefinitely
- Cannot short sell: Margin account required in the U.S.
- No special requirements: No minimums, no approval process
- No ongoing costs: No daily interest accrual
The key advantage of margin is amplified gains and the ability to short sell. The key disadvantages are amplified losses, interest costs, and forced liquidation risk. For long-term buy-and-hold investors, cash accounts are almost always superior. For short-term tactical traders with strict risk management, margin can be appropriate—but only if you fully understand and accept the risks.
When Does Margin Trading Make Sense?
Margin trading is not appropriate for most investors, but there are specific scenarios where it can be used effectively:
- Short-term tactical trades: High-conviction positions with a defined exit strategy and stop-loss
- Arbitrage opportunities: Low-risk, time-sensitive strategies that capitalize on pricing inefficiencies
- Professional traders: Those with sophisticated risk management systems, real-time monitoring, and experience with leverage
- Very liquid positions: Highly liquid securities where forced liquidation won’t result in significant slippage
Margin trading is NOT appropriate for:
- Long-term buy-and-hold investing: Interest costs compound over time and erode returns
- Volatile or speculative stocks: High volatility increases margin call risk exponentially
- Investors who can’t monitor positions daily: Margin accounts require constant attention
- Anyone uncomfortable with forced liquidation: If the thought of your broker selling your positions without notice keeps you up at night, don’t use margin
- Retirement accounts: Most retirement accounts don’t allow margin for good reason—the risk of permanent capital loss is too high
Understanding margin trading is critical for portfolio risk management. Our Portfolio Analytics & Risk Management course covers leverage, risk metrics, and portfolio construction strategies in depth.
Common Mistakes
Even experienced traders make costly mistakes with margin. Here are the seven most common errors and how to avoid them:
1. Ignoring Margin Interest Costs
At 11.8% annual on a $10,000 loan, you’re paying $1,180 per year or $3.23 per day. Over one year on a flat stock, you’re down 11.8% before any price movement. Many traders focus solely on stock gains and forget that interest accrues daily—even on losing positions.
Solution: Factor interest costs into your expected return calculations. If you expect a 15% gain but will pay 12% interest over your holding period, your net return is only 3%—likely not worth the risk.
2. Over-Leveraging
Using the maximum 50% margin on every position leaves no buffer for volatility. One bad trade triggers a margin call and forced liquidation across your entire account.
Solution: Use significantly less leverage than the maximum. Consider using only 20-30% margin instead of 50%, which provides a cushion for market fluctuations. Your gains will be smaller, but you’ll avoid catastrophic forced liquidation.
3. Not Understanding Forced Liquidation
Many traders assume they’ll receive a warning or get to choose which positions to sell during a margin call. In reality, brokers can liquidate immediately without notice, choose which securities to sell, and execute at market prices (possibly during panic selling).
Solution: Understand that you have zero control once a margin call is triggered. Broker discretion is absolute. Plan for this by using less leverage and setting your own stop-losses before the broker forces your hand.
4. Treating Margin Like Free Money
Margin is a loan with interest, not extra capital. You’re paying to borrow, and the cost compounds (typically monthly when posted).
Solution: View margin as a short-term financing tool with a specific purpose, not as “extra buying power.” Every dollar borrowed has a cost.
5. Ignoring the Margin Call Formula
Most traders never calculate the price level that triggers a margin call before entering a trade. This is the single most important number to know.
Solution: Before every margin trade, calculate: Margin Call Price = Purchase Price × (1 – Initial Margin) / (1 – Maintenance Margin). Know exactly how much downside you can tolerate.
6. Assuming 25% Applies to All Positions
The 25% FINRA minimum is just the floor. Many brokers use 30-40% as house rules. Low-priced stocks, leveraged ETFs, and concentrated positions often require 50-100% maintenance. Requirements can change intraday without notice.
Solution: Check your broker’s margin handbook for security-specific requirements. Don’t assume 25% applies to everything you hold. During volatile markets, brokers may increase requirements on specific stocks—sometimes to 100%, effectively forcing you to close the position.
7. Ignoring Gap and Slippage Risk During Forced Liquidation
Your broker liquidates at prevailing market prices. Gaps, illiquidity, and volatility can make execution far worse than expected. You bear all slippage costs. In extreme gaps, you can end up owing money even after losing your entire deposit.
Solution: Understand that forced liquidation doesn’t happen at favorable prices. It happens when the market is in turmoil, spreads are wide, and liquidity is poor. Factor this into your risk assessment. If you’re trading an illiquid stock on margin, the gap risk is enormous.
Can You Lose More Than You Invest on Margin?
This is the question every margin trader must answer before opening a margin account: Can you lose more than you initially deposited?
The answer is YES.
While long stock positions theoretically have limited downside (a stock can’t go below $0), in practice you can lose more than your initial deposit due to:
- Overnight gaps: The stock gaps down before your broker can liquidate (earnings miss, fraud announcement, trading halt)
- Illiquid markets: Forced liquidation executes at severely depressed prices with wide bid-ask spreads
- Fast-moving crashes: The broker can’t liquidate fast enough during flash crashes or circuit breaker halts
- You remain liable: If liquidation proceeds don’t cover the loan, you owe the difference to your broker
Real Example: -120% Loss
Setup:
- You deposit $10,000 cash
- You borrow $10,000 from your broker
- You buy $20,000 worth of stock
Overnight disaster: The company announces fraudulent accounting. The stock gaps down from $100 to $40 (-60%) before the market opens. Trading is halted briefly, then resumes at $40.
What happens:
- Your position is now worth $8,000 (200 shares × $40)
- Your broker liquidates immediately at $40/share
- Proceeds from sale: $8,000
- Loan still owed: $10,000
- Debit balance: You owe your broker $2,000
Total loss:
- Lost your entire $10,000 deposit
- Plus you owe $2,000 more
- Total: -$12,000 on a $10,000 investment = -120%
The broker will demand immediate payment of the $2,000 debit balance. If you can’t pay, they may pursue collections or legal action. This is a rare but REAL risk with margin trading.
Cash accounts cannot have this problem. The worst you can lose in a cash account is 100% of your investment (the stock goes to $0). With margin, losses can exceed 100% because you owe the loan regardless of what happens to the stock price.
Limitations and Risks
Beyond the risk of losing more than you invest, margin trading has several structural limitations that every trader must understand:
Forced Selling at the Worst Time
Margin calls are triggered during market drawdowns when prices are at their lowest. You’re forced to sell at exactly the wrong time, locking in permanent losses that a cash-account investor could simply wait out. This is perhaps the most insidious risk of margin: it removes your ability to be patient during temporary market declines.
Interest Costs Compound
Even if the stock goes sideways, you’re bleeding money to interest every single day. At 11.8% annual, you lose 1% per month to financing costs. Over time, this drag significantly erodes returns—especially in flat or choppy markets where gains are minimal.
Psychological Pressure
Watching a leveraged position move against you is psychologically stressful and can lead to poor decisions. The fear of a margin call may cause you to sell prematurely or panic during normal volatility. Leverage amplifies not just gains and losses, but also emotional responses.
Broker Discretion Is Absolute
Your broker can change margin requirements intraday without advance notice, especially during market volatility. A stock that was marginable at 30% maintenance in the morning might suddenly require 100% (no margin) by afternoon due to increased volatility or news. When this happens, you face an immediate margin call even if the position hasn’t moved against you.
Volatility Exposure Amplified
Leveraged positions have approximately 2x exposure to standard deviation risk. If a stock has 30% annual volatility, a 2x leveraged position effectively has 60% volatility. This dramatically increases the probability of hitting your margin call trigger price during normal market fluctuations.
VaR Underestimation
Value-at-Risk (VaR) calculations on leveraged portfolios must account for amplified tail risk. Standard VaR models often underestimate the true risk of leveraged positions because they assume normal distributions and don’t fully capture the impact of forced liquidation during market stress. A 5% VaR on an unleveraged portfolio might be 12-15% VaR on a 2x leveraged portfolio—not simply 10%.
Frequently Asked Questions
Maintenance margin is the minimum equity you need to keep a position open. The FINRA minimum is 25% for long positions, but most brokers set their house requirements at 30-40%. If your equity percentage falls below this threshold, your broker can force-liquidate your position immediately without warning.
Key difference: You can fall below the initial margin after purchasing without triggering a margin call. For example, if you buy $20,000 of stock with $10,000 cash (50% initial margin) and the stock falls to $16,000, your equity is now $6,000 ($16,000 – $10,000 loan), which is 37.5% of the market value—below the 50% initial margin but still above the 30% maintenance margin. No margin call. But if the stock continues to fall and your equity percentage hits the maintenance threshold, forced liquidation is triggered.
Example: You buy a stock at $100 with 50% initial margin and your broker has a 25% maintenance requirement.
Margin Call Price = $100 × (1 – 0.50) / (1 – 0.25) = $100 × 0.50 / 0.75 = $66.67
This means if the stock falls to $66.67, your equity percentage will hit exactly 25% and your broker will force-liquidate your position. You should calculate this number before entering every margin trade so you know exactly how much downside you can tolerate. If the margin call price is only 10-15% below your purchase price, you’re over-leveraged.
Example: You deposit $10,000, borrow $10,000, and buy $20,000 worth of stock. Overnight, the company announces fraudulent accounting and the stock gaps down 60% to $40/share before your broker can liquidate. Your position is now worth only $8,000. The broker liquidates at $8,000, but you still owe the $10,000 loan. You owe the broker $2,000 even after losing your entire $10,000 deposit. Total loss: -120%.
You remain liable for any debit balance after liquidation. The broker will demand immediate payment, and if you can’t pay, they may pursue collections or legal action. This is rare, but it’s a REAL risk that’s unique to margin trading. Cash accounts cannot have this problem—the worst you can lose in a cash account is 100% of your investment.
What your broker controls:
- Which securities to sell: The broker decides which positions to liquidate—you have no say
- How much to sell: They’ll sell as much as necessary to restore your account to compliance with margin requirements
- When to sell: Liquidation can happen at any time during market hours, often during periods of peak volatility
- At what price: Sales happen at prevailing market prices, which may include slippage, wide spreads, and illiquid conditions
You have zero control over this process once a margin call is triggered. Some brokers may give you a courtesy notification, but they are under no obligation to do so. Many traders discover they’ve been liquidated only when they log in and see their positions gone. This is why margin trading requires constant monitoring—you can’t set it and forget it.
Typical house rules: 30-40% maintenance for most stocks
Security-specific requirements:
- Low-priced stocks (under $5): Often 100% requirement (no margin allowed)
- Leveraged ETFs: Typically 75-100% maintenance
- Concentrated positions: If one position represents more than 20-30% of your account, brokers may impose higher requirements
- Volatile stocks: Brokers can increase requirements based on historical volatility, beta, or recent price movements
- Hard-to-borrow securities: Stocks with limited availability for short selling often have higher maintenance margins
Broker discretion: Requirements can change intraday without notice, especially during market stress. A stock that was marginable at 30% in the morning might suddenly require 100% (no margin) by afternoon due to increased volatility or company news. When this happens, you face an immediate margin call even if your positions haven’t moved.
Always check your broker’s margin handbook for current requirements on specific securities before trading.
Margin trading (buying on margin): Borrowing cash from your broker to buy securities. You hold a long position with leverage. Your potential loss is limited (theoretically) to the amount invested, though as discussed earlier, you can lose more than your deposit in gap scenarios.
Short selling: Borrowing securities from your broker to sell them, betting on a price decline. Your potential loss is unlimited because there’s no cap on how high a stock price can rise. If you short a stock at $50 and it rises to $500, you lose $450 per share—far more than your initial margin.
Key similarities: Both amplify risk, both accrue interest/fees (margin interest on borrowed cash for long margin; borrow fees for short selling), and both require a margin account with a broker.
Key differences: Long margin has limited (but amplified) downside; short selling has unlimited upside risk. Long margin benefits from dividends; short selling requires you to pay dividends to the lender of the shares.
Small retail balances (under $25,000): Approximately 11-13% annual at major brokers (as of February 2026)
Tiered rates for larger balances:
- $25,000-$100,000: ~9-10%
- $100,000-$500,000: ~7-8%
- $500,000-$1,000,000: ~6-7%
- $1,000,000+: ~5-6%
Rates are based on the broker’s base rate (which tracks the Federal Reserve’s benchmark rate) plus a spread. When the Fed raises or lowers rates, margin rates typically adjust within days.
Important notes:
- Interest accrues daily and typically compounds monthly when posted (not simple interest)
- Some brokers (Interactive Brokers, Robinhood Gold) offer significantly lower rates for all balance tiers
- Rates can vary even within the same broker based on account type (e.g., retail vs. institutional)
Always check your specific broker’s current margin rates before trading. At 11.8% annual on a $10,000 loan, you’re paying $3.23 per day or $98 per month—costs that add up quickly if you hold positions for extended periods.
Key restrictions:
- You can only deduct up to the amount of your investment income (dividends, interest, and short-term capital gains)
- You cannot deduct margin interest against long-term capital gains unless you elect to treat those gains as ordinary income—which means giving up the preferential long-term capital gains tax rate (a major trade-off)
- You must itemize deductions on Schedule A. If you take the standard deduction, you can’t claim investment interest expense
- Any disallowed interest (amount exceeding your investment income) can be carried forward to future years
Example: You pay $1,500 in margin interest during the year and have $1,000 in dividend income. You can deduct $1,000 of the interest in the current year. The remaining $500 carries forward to the next year.
This is a complex tax topic. Consult a qualified tax professional for your specific situation. See IRS Publication 550 (Investment Income and Expenses) for details. This is NOT tax advice.
PDT requirements:
- You must maintain a $25,000 minimum equity in your account at all times (measured at the end of each trading day)
- If your equity falls below $25,000, you cannot execute any day trades until you restore the balance
- You can still hold positions and make non-day-trade transactions (overnight holds)
Important notes:
- The PDT rule applies to margin accounts only. Cash accounts are exempt from the PDT rule, but they’re subject to separate free-riding and good faith violation rules (you can’t trade with unsettled funds)
- PDT status typically remains once flagged. Many brokers allow removal requests after a period of no day trading (commonly 60-90 days), but this varies by firm policy
- This is a FINRA rule, separate from margin requirements, but it’s commonly confused with margin trading because both involve margin accounts and minimum balance requirements
Many traders mistakenly think the $25,000 minimum is a margin requirement—it’s not. It’s specifically a day trading restriction designed to protect retail traders from the risks of active day trading on leverage.
Disclaimer
Last reviewed: February 2026. This article is for educational and informational purposes only and does not constitute financial, investment, or tax advice. Margin regulations and broker policies can change intraday without advance notice. Regulation T and FINRA requirements are current as of the publication date, but brokers set their own house rules above these minimums.
Specific margin rates, maintenance requirements, and security-specific rules vary significantly by broker. Always consult your broker’s current margin handbook and margin disclosure statement before trading. Margin trading involves substantial risk of loss and is not appropriate for all investors. You can lose more than your initial investment.
