Regulation T (Reg T Margin)
The Formal Definition
A Federal Reserve Board regulation establishing credit standards for securities transactions, requiring retail investors to deposit at least 50% of an equity purchase's cost in cash or marginable securities.
Reg T Initial Buying Power = Settled Cash Equity × 2.0 (50% Maximum Borrowing)
Cole Barrett's Reality Check
The Unvarnished Bottom Line"Regulation T has capped US margin borrowing at 50% since the 1970s. If you want to buy $10,000 worth of stock, Reg T says you must put up at least $5,000 of your own cash. It protects you from the reckless 1:500 leverage offered by offshore brokers, but keeps borrowing limits rigid compared to Portfolio Margin."
Interactive Simulator: Test the Math
Real-World Example: Scenario Breakdown
Examining the real numbers for: Purchasing $50,000 worth of S&P 500 index equities
| Execution Metric | Standard Reg T Margin Account | Offshore Island Broker (1:100 Leverage) |
|---|---|---|
| Fee / Rate | Compliant US broker | Unregulated entity |
| Spread / Buffer | Mandatory 50% initial equity deposit requirement | Requires only a 1.0% initial equity deposit |
| Execution / Status | Investor deposits $25,000 cash; borrows $25,000 | Investor deposits $500 cash; borrows $49,500 |
| Total Cost / Result | Conservative leverage buffer with low liquidation risk | A 1.0% adverse price move resulted in a total account wipeout |
How Brokers Weaponize This Term
Offshore brokerages target US traders blocked by Reg T margin caps, marketing high-leverage products that bypass Federal Reserve consumer safeguards.
Broker Evaluation Matrix
Cole Approves
Charles Schwab / Fidelity: Strict compliance with FINRA and Federal Reserve Reg T margin lending standards.
Read Audit →Cole Flags / Avoids
Unregulated Offshore Operators: Operates outside Reg T credit guidelines, offering high leverage with zero consumer balance protections.
View Trap Details →Frequently Asked Questions
Can you day-trade with higher leverage than 2:1 under Reg T?
Yes. Qualified Pattern Day Traders (PDTs) with over $25,000 in equity receive 4:1 intraday buying power, which resets back to 2:1 at the market close.
How long do you have to meet a Reg T margin deposit call?
Reg T technically allows up to four business days (T+4) to deposit required funds, though individual broker risk engines often demand immediate settlement.