For those who want to use margin for active, frequent trading, there is a specific set of rules known as the "Pattern Day Trader" (PDT) regulations. These rules were designed by FINRA to protect small investors from the high risks associated with rapid-fire trading on borrowed money .

Defining the Pattern Day Trader

You are classified as a Pattern Day Trader if you execute four or more "day trades" within five business days, provided those day trades make up more than 6% of your total trading activity for that period .

A "day trade" is defined as buying and selling (or selling and buying) the same security on the same day in a margin account .

The $25,000 Equity Requirement

The most significant hurdle for a PDT is the minimum equity requirement. If you are flagged as a Pattern Day Trader, you must maintain at least $25,000 in your account at all times . This equity can be a mix of cash and eligible securities.

If your account balance drops below $25,000, you will be prohibited from day trading until you deposit enough funds to bring the balance back up. This rule exists because day trading generates significant risk throughout the day that isn't captured by end-of-day margin calculations. The $25,000 acts as a "cushion" for the brokerage firm .

Day-Trading Buying Power

One of the perks of being a PDT is increased leverage. While a standard margin account offers 2:1 buying power for overnight positions, a Pattern Day Trader is generally allowed 4:1 buying power for trades made during the day .

Standard Margin: $10,000 cash = $20,000 buying power.
PDT Margin (Intraday): $25,000 cash = $100,000 buying power.

However, this 4:1 leverage only applies to positions opened and closed within the same day. If you hold a position overnight, it reverts to the standard 2:1 requirement. If you exceed your day-trading buying power, you will receive a "Day-Trading Margin Call," which must be met within five business days .

Frequently Asked Questions (FAQ)

Q: Can I day trade in a cash account to avoid the $25,000 rule?
A: No. Day trading in a cash account is generally not permitted because you must pay for every security in full before selling it. Attempting to day trade in a cash account often leads to "Good Faith Violations" and account restrictions .

Q: What happens if I am flagged as a PDT but I don't have $25,000?
A: Your broker will likely place a "day trading margin call" on your account. You will be restricted to "closing transactions only" (selling what you own) or trading on a cash-available basis until you either deposit the required funds or wait 90 days for the flag to be removed .

Q: Is margin interest tax-deductible?
A: In many cases, yes. Margin interest is often considered "investment interest expense," which can be used to offset investment income on your taxes. However, you should consult a tax professional, as rules vary based on your total income and the types of investments you hold.

Q: Can I use margin to buy an IPO?
A: Generally, no. Most brokers and the Federal Reserve prohibit using margin to buy Initial Public Offerings because they are too volatile and lack a trading history to serve as reliable collateral .

Q: Does my broker have to tell me if they change my margin requirements?
A: No. Brokers can increase house maintenance requirements at any time and are not required to provide you with advance written notice .

Summary Checklist for Beginners

Check your balance: Ensure you have at least $2,000 for basic margin or $25,000 for day trading.
Read the agreement: Understand your broker's specific "house" maintenance requirements.
Calculate the cost: Know your margin interest rate and how it affects your break-even point.
Identify non-marginable stocks: Don't assume every stock can be bought with borrowed money.
Monitor your cushion: Always know how much your portfolio can drop before a margin call is triggered.
Have a plan: Know exactly which stocks you will sell first if you receive a margin call.